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373 lines
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<head><title>Dense Vector Data Structure</title>
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<!--l. 1103--><div class="crosslinks"><p class="noindent">[<a
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href="userhtmlsu10.html" >next</a>] [<a
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href="userhtmlsu6.html" >prev</a>] [<a
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<h4 class="subsectionHead"><span class="titlemark">3.3 </span> <a
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id="x15-460003.3"></a>Dense Vector Data Structure</h4>
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<!--l. 1105--><p class="noindent" >The <a
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id="vdata"><span
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class="cmtt-10">psb</span><span
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class="cmtt-10">_T</span><span
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class="cmtt-10">_vect</span><span
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class="cmtt-10">_type</span></a> data structure encapsulates the dense vectors in a way similar
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to sparse matrices, i.e. including a base type <a
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id="vbasedata"><span
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class="cmtt-10">psb</span><span
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class="cmtt-10">_T</span><span
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class="cmtt-10">_base</span><span
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class="cmtt-10">_vect</span><span
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class="cmtt-10">_type</span></a>. The user will
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not, in general, access the vector components directly, but rather via the routines of
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sec. <a
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href="userhtmlse6.html#x40-770006">6<!--tex4ht:ref: sec:toolsrout --></a>. Among other simple things, we define here an extraction method that
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can be used to get a full copy of the part of the vector stored on the local
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process.
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<!--l. 1115--><p class="indent" > The type declaration is shown in figure <a
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href="#x15-46001r3">3<!--tex4ht:ref: fig:vectype --></a> where <span class="lstinline"></span><span
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class="cmtt-10">T</span> is a placeholder for the data
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type and precision variants
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<dl class="description"><dt class="description">
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<span
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class="cmbx-10">I</span> </dt><dd
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class="description">Integer;
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</dd><dt class="description">
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<span
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class="cmbx-10">S</span> </dt><dd
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class="description">Single precision real;
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</dd><dt class="description">
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<span
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class="cmbx-10">D</span> </dt><dd
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class="description">Double precision real;
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</dd><dt class="description">
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<span
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class="cmbx-10">C</span> </dt><dd
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class="description">Single precision complex;
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</dd><dt class="description">
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<span
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class="cmbx-10">Z</span> </dt><dd
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class="description">Double precision complex.</dd></dl>
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<!--l. 1125--><p class="noindent" >The actual data is contained in the polymorphic component <span class="lstinline"></span><span
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class="cmtt-10">v</span><span
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class="cmtt-10">%</span><span
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class="cmtt-10">v</span>; the separation between
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the application and the actual data is essential for cases where it is necessary to link
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to data storage made available elsewhere outside the direct control of the
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compiler/application, e.g. data stored in a graphics accelerator’s private
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memory.
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<!--l. 1131--><p class="indent" > <a
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id="x15-46001r3"></a><hr class="float"><div class="float"
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>
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<div class="center"
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>
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<!--l. 1145--><p class="noindent" >
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<div class="minipage"><div class="verbatim" id="verbatim-26">
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  type psb_T_base_vect_type
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 <br />    TYPE(KIND_), allocatable :: v(:)
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 <br />  end type psb_T_base_vect_type
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 <br />
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 <br />  type psb_T_vect_type
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 <br />    class(psb_T_base_vect_type), allocatable :: v
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 <br />  end type  psb_T_vect_type
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 <br />
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</div>
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<!--l. 1156--><p class="nopar" ></div></div>
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<br /> <div class="caption"
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><span class="id">Listing 3: </span><span
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class="content"> The PSBLAS defined data type that contains a dense vector.</span></div><!--tex4ht:label?: x15-46001r3 -->
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</div><hr class="endfloat" />
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<h5 class="subsubsectionHead"><span class="titlemark">3.3.1 </span> <a
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id="x15-470003.3.1"></a>Vector Methods</h5>
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<!--l. 1171--><p class="noindent" >
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<h5 class="subsubsectionHead"><span class="titlemark">3.3.2 </span> <a
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id="x15-480003.3.2"></a>get_nrows — Get number of rows in a dense vector</h5>
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<!--l. 1174--><p class="noindent" ><span class="lstinline"></span><span
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class="cmtt-10">nr</span><span
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class="cmtt-10"> </span><span
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class="cmtt-10">=</span><span
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class="cmtt-10"> </span><span
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class="cmtt-10">v</span><span
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class="cmtt-10">%</span><span
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class="cmtt-10">get_nrows</span><span
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class="cmtt-10">()</span>
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<!--l. 1176--><p class="indent" >
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<dl class="description"><dt class="description">
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<span
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class="cmbx-10">Type:</span> </dt><dd
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class="description">Asynchronous.
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</dd><dt class="description">
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<span
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class="cmbx-10">On Entry</span> </dt><dd
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class="description">
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</dd><dt class="description">
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<span
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class="cmbx-10">v</span> </dt><dd
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class="description">the dense vector<br
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class="newline" />Scope: <span
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class="cmbx-10">local</span><br
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class="newline" /></dd></dl>
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<!--l. 1186--><p class="indent" >
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<dl class="description"><dt class="description">
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<span
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class="cmbx-10">On Return</span> </dt><dd
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class="description">
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</dd><dt class="description">
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<span
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class="cmbx-10">Function value</span> </dt><dd
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class="description">The number of rows of dense vector <span class="lstinline"></span><span
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class="cmtt-10">v</span>.</dd></dl>
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<!--l. 1193--><p class="noindent" >
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<h5 class="subsubsectionHead"><span class="titlemark">3.3.3 </span> <a
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id="x15-490003.3.3"></a>sizeof — Get memory occupation in bytes of a dense vector</h5>
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<!--l. 1196--><p class="noindent" ><span class="lstinline"></span><span
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class="cmtt-10">memory_size</span><span
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class="cmtt-10"> </span><span
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class="cmtt-10">=</span><span
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class="cmtt-10"> </span><span
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class="cmtt-10">v</span><span
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class="cmtt-10">%</span><span
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class="cmtt-10">sizeof</span><span
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class="cmtt-10">()</span>
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<!--l. 1198--><p class="indent" >
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<dl class="description"><dt class="description">
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<span
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class="cmbx-10">Type:</span> </dt><dd
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class="description">Asynchronous.
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</dd><dt class="description">
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<span
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class="cmbx-10">On Entry</span> </dt><dd
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class="description">
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</dd><dt class="description">
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<span
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class="cmbx-10">v</span> </dt><dd
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class="description">the dense vector<br
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class="newline" />Scope: <span
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class="cmbx-10">local</span><br
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class="newline" /></dd></dl>
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<!--l. 1208--><p class="indent" >
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<dl class="description"><dt class="description">
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<span
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class="cmbx-10">On Return</span> </dt><dd
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class="description">
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</dd><dt class="description">
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<span
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class="cmbx-10">Function value</span> </dt><dd
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class="description">The memory occupation in bytes.</dd></dl>
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<!--l. 1214--><p class="noindent" >
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<h5 class="subsubsectionHead"><span class="titlemark">3.3.4 </span> <a
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id="x15-500003.3.4"></a>set — Set contents of the vector</h5>
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<div class="verbatim" id="verbatim-27">
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 call  v%set(alpha[,first,last])
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 <br /> call  v%set(vect[,first,last])
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 <br /> call  v%zero()
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</div>
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<!--l. 1228--><p class="nopar" >
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<!--l. 1231--><p class="indent" >
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<dl class="description"><dt class="description">
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<span
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class="cmbx-10">Type:</span> </dt><dd
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class="description">Asynchronous.
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</dd><dt class="description">
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<span
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class="cmbx-10">On Entry</span> </dt><dd
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class="description">
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</dd><dt class="description">
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<span
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class="cmbx-10">v</span> </dt><dd
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class="description">the dense vector<br
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class="newline" />Scope: <span
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class="cmbx-10">local</span><br
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class="newline" />
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</dd><dt class="description">
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<span
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class="cmbx-10">alpha</span> </dt><dd
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class="description">A scalar value. <br
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class="newline" />Scope: <span
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class="cmbx-10">local </span><br
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class="newline" />Type: <span
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class="cmbx-10">required </span><br
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class="newline" />Intent: <span
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class="cmbx-10">in</span>.<br
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class="newline" />Specified as: a number of the data type indicated in Table <a
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href="userhtmlsu10.html#x19-56001r1">1<!--tex4ht:ref: tab:f90axpby --></a>.
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</dd><dt class="description">
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<span
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class="cmbx-10">first,last</span> </dt><dd
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class="description">Boundaries for setting in the vector.<br
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class="newline" />Scope: <span
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class="cmbx-10">local </span><br
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class="newline" />Type: <span
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class="cmbx-10">optional </span><br
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class="newline" />Intent: <span
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class="cmbx-10">in</span>.<br
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class="newline" />Specified as: integers.
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</dd><dt class="description">
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<span
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class="cmbx-10">vect</span> </dt><dd
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class="description">An array <br
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class="newline" />Scope: <span
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class="cmbx-10">local </span><br
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class="newline" />Type: <span
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class="cmbx-10">required </span><br
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class="newline" />Intent: <span
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class="cmbx-10">in</span>.<br
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class="newline" />Specified as: a number of the data type indicated in Table <a
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href="userhtmlsu10.html#x19-56001r1">1<!--tex4ht:ref: tab:f90axpby --></a>.</dd></dl>
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<!--l. 1250--><p class="noindent" >Note that a call to <span class="lstinline"></span><span
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class="cmtt-10">v</span><span
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class="cmtt-10">%</span><span
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class="cmtt-10">zero</span><span
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class="cmtt-10">()</span> is provided as a shorthand, but is equivalent to a call
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to <span class="lstinline"></span><span
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class="cmtt-10">v</span><span
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class="cmtt-10">%</span><span
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class="cmtt-10">set</span><span
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class="cmtt-10">(</span><span
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class="cmtt-10">zero</span><span
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class="cmtt-10">)</span> with the <span class="lstinline"></span><span
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class="cmtt-10">zero</span> constant having the appropriate type and
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kind.
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<!--l. 1254--><p class="indent" >
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<dl class="description"><dt class="description">
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<span
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class="cmbx-10">On Return</span> </dt><dd
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class="description">
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</dd><dt class="description">
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<span
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class="cmbx-10">v</span> </dt><dd
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class="description">the dense vector, with updated entries<br
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class="newline" />Scope: <span
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class="cmbx-10">local</span><br
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class="newline" /></dd></dl>
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<!--l. 1260--><p class="noindent" >
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<h5 class="subsubsectionHead"><span class="titlemark">3.3.5 </span> <a
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id="x15-510003.3.5"></a>get_vect — Get a copy of the vector contents</h5>
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<div class="verbatim" id="verbatim-28">
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extv = v%get_vect([n])
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</div>
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<!--l. 1265--><p class="nopar" >
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<!--l. 1267--><p class="indent" >
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<dl class="description"><dt class="description">
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<span
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class="cmbx-10">Type:</span> </dt><dd
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class="description">Asynchronous.
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</dd><dt class="description">
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<span
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class="cmbx-10">On Entry</span> </dt><dd
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class="description">
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</dd><dt class="description">
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<span
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class="cmbx-10">v</span> </dt><dd
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class="description">the dense vector<br
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class="newline" />Scope: <span
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class="cmbx-10">local</span><br
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class="newline" />
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</dd><dt class="description">
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<span
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class="cmbx-10">n</span> </dt><dd
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class="description">Size to be returned<br
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class="newline" />Scope: <span
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class="cmbx-10">local</span>.<br
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class="newline" />Type: <span
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class="cmbx-10">optional</span>; default: entire vector.<br
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class="newline" />
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</dd></dl>
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<!--l. 1281--><p class="indent" >
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<dl class="description"><dt class="description">
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<span
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class="cmbx-10">On Return</span> </dt><dd
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class="description">
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</dd><dt class="description">
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<span
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class="cmbx-10">Function value</span> </dt><dd
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class="description">An allocatable array holding a copy of the dense vector
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contents. If the argument <span
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class="cmmi-10">n </span>is specified, the size of the returned array
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equals the minimum between <span
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class="cmmi-10">n </span>and the internal size of the vector, or 0 if
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<span
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class="cmmi-10">n </span>is negative; otherwise, the size of the array is the same as the internal
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size of the vector.</dd></dl>
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<!--l. 1290--><p class="noindent" >
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<h5 class="subsubsectionHead"><span class="titlemark">3.3.6 </span> <a
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id="x15-520003.3.6"></a>clone — Clone current object</h5>
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<div class="verbatim" id="verbatim-29">
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call  x%clone(y,info)
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</div>
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<!--l. 1294--><p class="nopar" >
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<!--l. 1296--><p class="indent" >
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<dl class="description"><dt class="description">
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<span
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class="cmbx-10">Type:</span> </dt><dd
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class="description">Asynchronous.
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</dd><dt class="description">
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<span
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class="cmbx-10">On Entry</span> </dt><dd
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class="description">
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</dd><dt class="description">
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<span
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class="cmbx-10">x</span> </dt><dd
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class="description">the dense vector.<br
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class="newline" />Scope: <span
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class="cmbx-10">local</span>.<br
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class="newline" /></dd></dl>
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<!--l. 1306--><p class="indent" >
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<dl class="description"><dt class="description">
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<span
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class="cmbx-10">On Return</span> </dt><dd
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class="description">
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</dd><dt class="description">
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<span
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class="cmbx-10">y</span> </dt><dd
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class="description">A copy of the input object.
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</dd><dt class="description">
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<span
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class="cmbx-10">info</span> </dt><dd
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class="description">Return code.</dd></dl>
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<!--l. 1313--><div class="crosslinks"><p class="noindent">[<a
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href="userhtmlsu10.html" >next</a>] [<a
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href="userhtmlsu6.html" >prev</a>] [<a
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href="userhtmlsu6.html#tailuserhtmlsu6.html" >prev-tail</a>] [<a
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href="userhtmlsu7.html" >front</a>] [<a
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href="userhtmlsu7.html#userhtmlse4.html" >up</a>] </p></div>
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<!--l. 1313--><p class="indent" > <a
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id="tailuserhtmlsu7.html"></a>
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</body></html>
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