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<h3 class="sectionHead"><span class="titlemark">3 </span> <a
id="x12-90003"></a>Data Structures and Classes</h3>
<!--l. 5--><p class="noindent" >In this chapter we illustrate the data structures used for definition of routines
interfaces. They include data structures for sparse matrices, communication
descriptors and preconditioners.
<!--l. 11--><p class="indent" > All the data types and the basic subroutine interfaces related to descriptors and
sparse matrices are defined in the module <span class="lstinline"></span><span
class="cmtt-10">psb_base_mod</span>; this will have to be
included by every user subroutine that makes use of the library. The preconditioners
are defined in the module <span class="lstinline"></span><span
class="cmtt-10">psb_prec_mod</span>
<!--l. 17--><p class="indent" > Integer, real and complex data types are parametrized with a kind type defined in
the library as follows:
<dl class="description"><dt class="description">
<span
class="cmbx-10">psb</span><span
class="cmbx-10">_spk</span><span
class="cmbx-10">_</span> </dt><dd
class="description">Kind parameter for short precision real and complex data;
corresponds to a <span class="lstinline"></span><span
class="cmtt-10">REAL</span> declaration and is normally 4 bytes;
</dd><dt class="description">
<span
class="cmbx-10">psb</span><span
class="cmbx-10">_dpk</span><span
class="cmbx-10">_</span> </dt><dd
class="description">Kind parameter for long precision real and complex data;
corresponds to a <span class="lstinline"></span><span
class="cmtt-10">DOUBLE</span><span
class="cmtt-10">&#x00A0;</span><span
class="cmtt-10">PRECISION</span> declaration and is normally 8 bytes;
</dd><dt class="description">
<span
class="cmbx-10">psb</span><span
class="cmbx-10">_mpk</span><span
class="cmbx-10">_</span> </dt><dd
class="description">Kind parameter for 4-bytes integer data, as is always used by MPI;
</dd><dt class="description">
<span
class="cmbx-10">psb</span><span
class="cmbx-10">_epk</span><span
class="cmbx-10">_</span> </dt><dd
class="description">Kind parameter for 8-bytes integer data, as is always used by the
<span class="lstinline"></span><span
class="cmtt-10">sizeof</span> methods;
</dd><dt class="description">
<span
class="cmbx-10">psb</span><span
class="cmbx-10">_ipk</span><span
class="cmbx-10">_</span> </dt><dd
class="description">Kind parameter for &#8220;local&#8221; integer indices and data; with default
build options this is a 4 bytes integer;
</dd><dt class="description">
<span
class="cmbx-10">psb</span><span
class="cmbx-10">_lpk</span><span
class="cmbx-10">_</span> </dt><dd
class="description">Kind parameter for &#8220;global&#8221; integer indices and data; with default
build options this is an 8 bytes integer;</dd></dl>
<!--l. 35--><p class="noindent" >The integer kinds for local and global indices can be chosen at configure time to hold 4
or 8 bytes, with the global indices at least as large as the local ones. Together with
the classes attributes we also discuss their methods. Most methods detailed here only
act on the local variable, i.e. their action is purely local and asynchronous unless
otherwise stated. The list of methods here is not completely exhaustive; many
methods, especially those that alter the contents of the various objects, are usually
not needed by the end-user, and therefore are described in the developer&#8217;s
documentation.
<!--l. 48--><p class="noindent" >
<div class="subsectionTOCS">
&#x00A0;<span class="subsectionToc" >3.1 <a
href="userhtmlsu5.html#x13-100003.1">Descriptor data structure</a></span>
<br /> &#x00A0;&#x00A0;<span class="subsubsectionToc" >3.1.1 <a
href="userhtmlsu5.html#x13-110003.1.1">Descriptor Methods</a></span>
<br /> &#x00A0;&#x00A0;<span class="subsubsectionToc" >3.1.2 <a
href="userhtmlsu5.html#x13-120003.1.2">get_local_rows &#8212; Get number of local rows</a></span>
<br /> &#x00A0;&#x00A0;<span class="subsubsectionToc" >3.1.3 <a
href="userhtmlsu5.html#x13-130003.1.3">get_local_cols &#8212; Get number of local cols</a></span>
<br /> &#x00A0;&#x00A0;<span class="subsubsectionToc" >3.1.4 <a
href="userhtmlsu5.html#x13-140003.1.4">get_global_rows &#8212; Get number of global rows</a></span>
<br /> &#x00A0;&#x00A0;<span class="subsubsectionToc" >3.1.5 <a
href="userhtmlsu5.html#x13-150003.1.5">get_global_cols &#8212; Get number of global cols</a></span>
<br /> &#x00A0;&#x00A0;<span class="subsubsectionToc" >3.1.6 <a
href="userhtmlsu5.html#x13-160003.1.6">get_global_indices &#8212; Get vector of global indices</a></span>
<br /> &#x00A0;&#x00A0;<span class="subsubsectionToc" >3.1.7 <a
href="userhtmlsu5.html#x13-170003.1.7">get_context &#8212; Get communication context</a></span>
<br /> &#x00A0;&#x00A0;<span class="subsubsectionToc" >3.1.8 <a
href="userhtmlsu5.html#x13-180003.1.8">Clone &#8212; clone current object</a></span>
<br /> &#x00A0;&#x00A0;<span class="subsubsectionToc" >3.1.9 <a
href="userhtmlsu5.html#x13-190003.1.9">CNV &#8212; convert internal storage format</a></span>
<br /> &#x00A0;&#x00A0;<span class="subsubsectionToc" >3.1.10 <a
href="userhtmlsu5.html#x13-200003.1.10">psb_cd_get_large_threshold &#8212; Get threshold for index mapping switch</a></span>
<br /> &#x00A0;&#x00A0;<span class="subsubsectionToc" >3.1.11 <a
href="userhtmlsu5.html#x13-210003.1.11">psb_cd_set_large_threshold &#8212; Set threshold for index mapping switch</a></span>
<br /> &#x00A0;&#x00A0;<span class="subsubsectionToc" >3.1.12 <a
href="userhtmlsu5.html#x13-220003.1.12">get_p_adjcncy &#8212; Get process adjacency list</a></span>
<br /> &#x00A0;&#x00A0;<span class="subsubsectionToc" >3.1.13 <a
href="userhtmlsu5.html#x13-230003.1.13">set_p_adjcncy &#8212; Set process adjacency list</a></span>
<br /> &#x00A0;&#x00A0;<span class="subsubsectionToc" >3.1.14 <a
href="userhtmlsu5.html#x13-240003.1.14">fnd_owner &#8212; Find the owner process of a set of indices</a></span>
<br /> &#x00A0;&#x00A0;<span class="subsubsectionToc" >3.1.15 <a
href="userhtmlsu5.html#x13-250003.1.15">Named Constants</a></span>
<br /> &#x00A0;<span class="subsectionToc" >3.2 <a
href="userhtmlsu6.html#x14-260003.2">Sparse Matrix class</a></span>
<br /> &#x00A0;&#x00A0;<span class="subsubsectionToc" >3.2.1 <a
href="userhtmlsu6.html#x14-270003.2.1">Sparse Matrix Methods</a></span>
<br /> &#x00A0;&#x00A0;<span class="subsubsectionToc" >3.2.2 <a
href="userhtmlsu6.html#x14-280003.2.2">get_nrows &#8212; Get number of rows in a sparse matrix</a></span>
<br /> &#x00A0;&#x00A0;<span class="subsubsectionToc" >3.2.3 <a
href="userhtmlsu6.html#x14-290003.2.3">get_ncols &#8212; Get number of columns in a sparse matrix</a></span>
<br /> &#x00A0;&#x00A0;<span class="subsubsectionToc" >3.2.4 <a
href="userhtmlsu6.html#x14-300003.2.4">get_nnzeros &#8212; Get number of nonzero elements in a sparse matrix</a></span>
<br /> &#x00A0;&#x00A0;<span class="subsubsectionToc" >3.2.5 <a
href="userhtmlsu6.html#x14-310003.2.5">get_size &#8212; Get maximum number of nonzero elements in a sparse matrix</a></span>
<br /> &#x00A0;&#x00A0;<span class="subsubsectionToc" >3.2.6 <a
href="userhtmlsu6.html#x14-320003.2.6">sizeof &#8212; Get memory occupation in bytes of a sparse matrix</a></span>
<br /> &#x00A0;&#x00A0;<span class="subsubsectionToc" >3.2.7 <a
href="userhtmlsu6.html#x14-330003.2.7">get_fmt &#8212; Short description of the dynamic type</a></span>
<br /> &#x00A0;&#x00A0;<span class="subsubsectionToc" >3.2.8 <a
href="userhtmlsu6.html#x14-340003.2.8">is_bld, is_upd, is_asb &#8212; Status check</a></span>
<br /> &#x00A0;&#x00A0;<span class="subsubsectionToc" >3.2.9 <a
href="userhtmlsu6.html#x14-350003.2.9">is_lower, is_upper, is_triangle, is_unit &#8212; Format check</a></span>
<br /> &#x00A0;&#x00A0;<span class="subsubsectionToc" >3.2.10 <a
href="userhtmlsu6.html#x14-360003.2.10">cscnv &#8212; Convert to a different storage format</a></span>
<br /> &#x00A0;&#x00A0;<span class="subsubsectionToc" >3.2.11 <a
href="userhtmlsu6.html#x14-370003.2.11">csclip &#8212; Reduce to a submatrix</a></span>
<br /> &#x00A0;&#x00A0;<span class="subsubsectionToc" >3.2.12 <a
href="userhtmlsu6.html#x14-380003.2.12">clean_zeros &#8212; Eliminate zero coefficients</a></span>
<br /> &#x00A0;&#x00A0;<span class="subsubsectionToc" >3.2.13 <a
href="userhtmlsu6.html#x14-390003.2.13">get_diag &#8212; Get main diagonal</a></span>
<br /> &#x00A0;&#x00A0;<span class="subsubsectionToc" >3.2.14 <a
href="userhtmlsu6.html#x14-400003.2.14">clip_diag &#8212; Cut out main diagonal</a></span>
<br /> &#x00A0;&#x00A0;<span class="subsubsectionToc" >3.2.15 <a
href="userhtmlsu6.html#x14-410003.2.15">tril &#8212; Return the lower triangle</a></span>
<br /> &#x00A0;&#x00A0;<span class="subsubsectionToc" >3.2.16 <a
href="userhtmlsu6.html#x14-420003.2.16">triu &#8212; Return the upper triangle</a></span>
<br /> &#x00A0;&#x00A0;<span class="subsubsectionToc" >3.2.17 <a
href="userhtmlsu6.html#x14-430003.2.17">psb_set_mat_default &#8212; Set default storage format</a></span>
<br /> &#x00A0;&#x00A0;<span class="subsubsectionToc" >3.2.18 <a
href="userhtmlsu6.html#x14-440003.2.18">clone &#8212; Clone current object</a></span>
<br /> &#x00A0;&#x00A0;<span class="subsubsectionToc" >3.2.19 <a
href="userhtmlsu6.html#x14-450003.2.19">Named Constants</a></span>
<br /> &#x00A0;<span class="subsectionToc" >3.3 <a
href="userhtmlsu7.html#x15-460003.3">Dense Vector Data Structure</a></span>
<br /> &#x00A0;&#x00A0;<span class="subsubsectionToc" >3.3.1 <a
href="userhtmlsu7.html#x15-470003.3.1">Vector Methods</a></span>
<br /> &#x00A0;&#x00A0;<span class="subsubsectionToc" >3.3.2 <a
href="userhtmlsu7.html#x15-480003.3.2">get_nrows &#8212; Get number of rows in a dense vector</a></span>
<br /> &#x00A0;&#x00A0;<span class="subsubsectionToc" >3.3.3 <a
href="userhtmlsu7.html#x15-490003.3.3">sizeof &#8212; Get memory occupation in bytes of a dense vector</a></span>
<br /> &#x00A0;&#x00A0;<span class="subsubsectionToc" >3.3.4 <a
href="userhtmlsu7.html#x15-500003.3.4">set &#8212; Set contents of the vector</a></span>
<br /> &#x00A0;&#x00A0;<span class="subsubsectionToc" >3.3.5 <a
href="userhtmlsu7.html#x15-510003.3.5">get_vect &#8212; Get a copy of the vector contents</a></span>
<br /> &#x00A0;&#x00A0;<span class="subsubsectionToc" >3.3.6 <a
href="userhtmlsu7.html#x15-520003.3.6">clone &#8212; Clone current object</a></span>
<br /> &#x00A0;<span class="subsectionToc" >3.4 <a
href="userhtmlsu8.html#x16-530003.4">Preconditioner data structure</a></span>
<br /> &#x00A0;<span class="subsectionToc" >3.5 <a
href="userhtmlsu9.html#x17-540003.5">Heap data structure</a></span>
</div>
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