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Salvatore Filippone
+59
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@@ -7,8 +7,8 @@ original version by: Nikos Drakos, CBLU, University of Leeds
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Jens Lippmann, Marek Rouchal, Martin Wilck and others -->
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<HTML>
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<HEAD>
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<TITLE>Dense Vector Data Structure</TITLE>
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<META NAME="description" CONTENT="Dense Vector Data Structure">
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<TITLE>csclip -- Reduce to a submatrix</TITLE>
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@@ -18,147 +18,92 @@ original version by: Nikos Drakos, CBLU, University of Leeds
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<BR>
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<B> Next:</B> <A NAME="tex2html597"
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HREF="node33.html">Vector Methods</A>
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<B> Up:</B> <A NAME="tex2html593"
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HREF="node9.html">Data Structures and Classes</A>
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<B> Previous:</B> <A NAME="tex2html587"
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HREF="node31.html">Named Constants</A>
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<B> <A NAME="tex2html595"
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<B> Next:</B> <A NAME="tex2html620"
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HREF="node33.html">clip_diag Cut</A>
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<B> Up:</B> <A NAME="tex2html616"
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HREF="node21.html">Sparse Matrix class</A>
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<B> Previous:</B> <A NAME="tex2html610"
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HREF="node31.html">cscnv Convert</A>
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<B> <A NAME="tex2html618"
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HREF="node1.html">Contents</A></B>
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<BR>
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<BR>
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<!--End of Navigation Panel-->
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<H2><A NAME="SECTION00043000000000000000"></A>
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<A NAME="sec:vecttype"></A>
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<BR>
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Dense Vector Data Structure
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</H2>
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The vdata<TT>psb_T_vect_type</TT> data structure
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encapsulates the dense vectors in a way similar to sparse matrices,
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i.e. including a base type vbasedata<TT> psb_T_base_vect_type</TT>.
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The user will not, in general, access the vector components directly,
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but rather via the routines of sec. <A HREF="node58.html#sec:toolsrout">6</A>. Among other
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simple things, we define here an extraction method that can be used to
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get a full copy of the part of the vector stored on the local
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process.
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<H3><A NAME="SECTION000421100000000000000">
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csclip -- Reduce to a submatrix</A>
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</H3>
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<PRE>
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call a%csclip(b,info[,&
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& imin,imax,jmin,jmax,rscale,cscale])
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</PRE>
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<P>
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The type declaration is shown in
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figure <A HREF="#fig:vectype">5</A> where <code>T</code> is a placeholder for the
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data type and precision variants
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Returns the submatrix <code>A(imin:imax,jmin:jmax)</code>, optionally
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rescaling row/col indices to the range
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<code>1:imax-imin+1,1:jmax-jmin+1</code>.
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<DL>
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<DT><STRONG>I</STRONG></DT>
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<DD>Integer;
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<DT><STRONG>Type:</STRONG></DT>
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<DD>Asynchronous.
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</DD>
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<DT><STRONG>S</STRONG></DT>
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<DD>Single precision real;
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<DT><STRONG><B>On Entry</B></STRONG></DT>
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<DD>
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</DD>
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<DT><STRONG>D</STRONG></DT>
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<DD>Double precision real;
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<DT><STRONG>a</STRONG></DT>
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<DD>the sparse matrix.
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<BR>
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A variable of type <code>psb_Tspmat_type</code>.
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<BR>
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Scope: <B>local</B>.
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<BR></DD>
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<DT><STRONG>imin,imax,jmin,jmax</STRONG></DT>
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<DD>Minimum and maximum row and column indices.
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<BR>
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Type: optional.
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</DD>
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<DT><STRONG>C</STRONG></DT>
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<DD>Single precision complex;
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</DD>
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<DT><STRONG>Z</STRONG></DT>
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<DD>Double precision complex.
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<DT><STRONG>rscale,cscale</STRONG></DT>
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<DD>Whether to rescale row/column indices.
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Type: optional.
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</DD>
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</DL>
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<DL>
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<DT><STRONG><B>On Return</B></STRONG></DT>
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<DD>
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</DD>
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<DT><STRONG>b</STRONG></DT>
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<DD>A copy of a submatrix of <code>a</code>.
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<BR>
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A variable of type <code>psb_Tspmat_type</code>.
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</DD>
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<DT><STRONG>info</STRONG></DT>
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<DD>Return code.
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</DD>
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</DL>
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The actual data is contained in the polymorphic component <code>v%v</code>;
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the separation between the application and the actual data is
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essential for cases where it is necessary to link to data storage made
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available elsewhere outside the direct control of the
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compiler/application, e.g. data stored in a graphics accelerator's
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private memory.
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<DIV ALIGN="CENTER"><A NAME="fig:vectype"></A><A NAME="779"></A>
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<TABLE>
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<CAPTION ALIGN="BOTTOM"><STRONG>Figure 5:</STRONG>
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The PSBLAS defined data type that
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contains a dense vector.</CAPTION>
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<TR><TD><DIV ALIGN="CENTER">
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</DIV><TABLE WIDTH="85%">
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<TR><TD>
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<PRE>
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type psb_T_base_vect_type
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TYPE(KIND_), allocatable :: v(:)
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end type psb_T_base_vect_type
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type psb_T_vect_type
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class(psb_T_base_vect_type), allocatable :: v
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end type psb_T_vect_type
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</PRE></TD></TR>
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</TABLE>
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<DIV ALIGN="CENTER">
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</DIV></TD></TR>
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</TABLE>
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</DIV>
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<P>
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<BR><HR>
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<!--Table of Child-Links-->
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<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A>
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<UL>
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<LI><A NAME="tex2html598"
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HREF="node33.html">Vector Methods</A>
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<LI><A NAME="tex2html599"
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HREF="node34.html">get_nrows -- Get number of rows in a dense vector</A>
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<LI><A NAME="tex2html600"
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HREF="node35.html">sizeof -- Get memory occupation in bytes
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of a dense vector</A>
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<LI><A NAME="tex2html601"
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HREF="node36.html">get_vect -- Get a copy of the vector contents</A>
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<LI><A NAME="tex2html602"
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HREF="node37.html">clone -- Clone current object</A>
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</UL>
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