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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML3.2 EN">
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<TITLE>MatGetRowIJ</TITLE>
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<A NAME="MatGetRowIJ"><H1>MatGetRowIJ</H1></A>
Returns the compressed row storage i and j indices for sequential matrices.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscmat.h"
PetscErrorCode MatGetRowIJ(Mat mat,PetscInt shift,PetscBool symmetric,PetscBool inodecompressed,PetscInt *n,PetscInt *ia[],PetscInt* ja[],PetscBool *done)
</PRE>
Collective on <A HREF="../Mat/Mat.html#Mat">Mat</A>
<P>
<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>mat </B></TD><TD>- the matrix
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>shift </B></TD><TD>- 0 or 1 indicating we want the indices starting at 0 or 1
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>symmetric </B></TD><TD>- <A HREF="../Sys/PETSC_TRUE.html#PETSC_TRUE">PETSC_TRUE</A> or <A HREF="../Sys/PETSC_FALSE.html#PETSC_FALSE">PETSC_FALSE</A> indicating the matrix data structure should be symmetrized
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>inodecompressed </B></TD><TD>- <A HREF="../Sys/PETSC_TRUE.html#PETSC_TRUE">PETSC_TRUE</A> or <A HREF="../Sys/PETSC_FALSE.html#PETSC_FALSE">PETSC_FALSE</A> indicating if the nonzero structure of the
inodes or the nonzero elements is wanted. For BAIJ matrices the compressed version is
always used.
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>n </B></TD><TD>- number of rows in the (possibly compressed) matrix
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ia </B></TD><TD>- the row pointers [of length n+1]
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ja </B></TD><TD>- the column indices
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>done </B></TD><TD>- indicates if the routine actually worked and returned appropriate ia[] and ja[] arrays; callers
are responsible for handling the case when done == <A HREF="../Sys/PETSC_FALSE.html#PETSC_FALSE">PETSC_FALSE</A> and ia and ja are not set
</TD></TR></TABLE>
<P>
<P>
Notes: You CANNOT change any of the ia[] or ja[] values.
<P>
Use <A HREF="../Mat/MatRestoreRowIJ.html#MatRestoreRowIJ">MatRestoreRowIJ</A>() when you are finished accessing the ia[] and ja[] values
<P>
Fortran Node
<P>
In Fortran use
<pre>
<A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A> ia(1), ja(1)
</pre>
<pre>
PetscOffset iia, jja
</pre>
<pre>
call <A HREF="../Mat/MatGetRowIJ.html#MatGetRowIJ">MatGetRowIJ</A>(mat,shift,symmetric,inodecompressed,n,ia,iia,ja,jja,done,ierr)
</pre>
<pre>
</pre>
<pre>
or
</pre>
<pre>
</pre>
<pre>
<A HREF="../Sys/PetscScalar.html#PetscScalar">PetscScalar</A>, pointer :: xx_v(:)
</pre>
<pre>
call MatGetRowIJF90(mat,shift,symmetric,inodecompressed,n,ia,ja,done,ierr)
</pre>
<P>
<P>
Acess the ith and jth entries via ia(iia + i) and ja(jja + j)
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Mat/MatGetColumnIJ.html#MatGetColumnIJ">MatGetColumnIJ</A>(), <A HREF="../Mat/MatRestoreRowIJ.html#MatRestoreRowIJ">MatRestoreRowIJ</A>(), <A HREF="../Mat/MatGetArray.html#MatGetArray">MatGetArray</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>developer
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/mat/interface/matrix.c.html#MatGetRowIJ">src/mat/interface/matrix.c</A>
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