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<TITLE>MatSeqAIJSetPreallocationCSR</TITLE>
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<div id="version" align=right><b>petsc-3.14.5 2021-03-03</b></div>
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<A NAME="MatSeqAIJSetPreallocationCSR"><H1>MatSeqAIJSetPreallocationCSR</H1></A>
Allocates memory for a sparse sequential matrix in AIJ format.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscmat.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../Mat/MatSeqAIJSetPreallocationCSR.html#MatSeqAIJSetPreallocationCSR">MatSeqAIJSetPreallocationCSR</A>(<A HREF="../Mat/Mat.html#Mat">Mat</A> B,const <A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A> i[],const <A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A> j[],const <A HREF="../Sys/PetscScalar.html#PetscScalar">PetscScalar</A> v[])
</PRE>
<H3><FONT COLOR="#CC3333">Input Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>B </B></TD><TD>- the matrix
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>i </B></TD><TD>- the indices into j for the start of each row (starts with zero)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>j </B></TD><TD>- the column indices for each row (starts with zero) these must be sorted for each row
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>v </B></TD><TD>- optional values in the matrix
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
The i,j,v values are COPIED with this routine; to avoid the copy use <A HREF="../Mat/MatCreateSeqAIJWithArrays.html#MatCreateSeqAIJWithArrays">MatCreateSeqAIJWithArrays</A>()
<P>
This routine may be called multiple times with different nonzero patterns (or the same nonzero pattern). The nonzero
structure will be the union of all the previous nonzero structures.
<P>
<H3><FONT COLOR="#CC3333">Developer Notes</FONT></H3>
An optimization could be added to the implementation where it checks if the i, and j are identical to the current i and j and
then just copies the v values directly with <A HREF="../Sys/PetscMemcpy.html#PetscMemcpy">PetscMemcpy</A>().
<P>
This routine could also take a <A HREF="../Sys/PetscCopyMode.html#PetscCopyMode">PetscCopyMode</A> argument to allow sharing the values instead of always copying them.
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Mat/MatCreate.html#MatCreate">MatCreate</A>(), <A HREF="../Mat/MatCreateSeqAIJ.html#MatCreateSeqAIJ">MatCreateSeqAIJ</A>(), <A HREF="../Mat/MatSetValues.html#MatSetValues">MatSetValues</A>(), <A HREF="../Mat/MatSeqAIJSetPreallocation.html#MatSeqAIJSetPreallocation">MatSeqAIJSetPreallocation</A>(), <A HREF="../Mat/MatCreateSeqAIJ.html#MatCreateSeqAIJ">MatCreateSeqAIJ</A>(), <A HREF="../Mat/MATSEQAIJ.html#MATSEQAIJ">MATSEQAIJ</A>, <A HREF="../Mat/MatResetPreallocation.html#MatResetPreallocation">MatResetPreallocation</A>()
<BR><P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>developer<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/mat/impls/aij/seq/aij.c.html#MatSeqAIJSetPreallocationCSR">src/mat/impls/aij/seq/aij.c</A>
<P><H3><FONT COLOR="CC3333">Implementations</FONT></H3><A HREF="../../../src/mat/impls/aij/seq/aij.c.html#MatSeqAIJSetPreallocationCSR_SeqAIJ">MatSeqAIJSetPreallocationCSR_SeqAIJ in src/mat/impls/aij/seq/aij.c</A><BR>
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