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<div id="version" align=right><b>petsc-3.7.5 2017-01-01</b></div>
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<A NAME="PetscBLASInt"><H1>PetscBLASInt</H1></A>
datatype used to represent 'int' parameters to BLAS/LAPACK functions.
<P>
Notes: usually this is the same as <A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A>, but if PETSc was built with --with-64-bit-indices but
standard C/Fortran integers are 32 bit then this is NOT the same as <A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A> it remains 32 bit
(except on very rare BLAS/LAPACK implementations that support 64 bit integers see the note below).
<P>
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../Sys/PetscBLASIntCast.html#PetscBLASIntCast">PetscBLASIntCast</A>(a,&b) checks if the given <A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A> a will fit in a <A HREF="../Sys/PetscBLASInt.html#PetscBLASInt">PetscBLASInt</A>, if not it
generates a PETSC_ERR_ARG_OUTOFRANGE error
<P>
Installation Notes: The 64bit versions of MATLAB ship with BLAS and LAPACK that use 64 bit integers for sizes etc,
if you run ./configure with the option
--with-blas-lapack-lib=[/Applications/MATLAB_R2010b.app/bin/maci64/libmwblas.dylib,/Applications/MATLAB_R2010b.app/bin/maci64/libmwlapack.dylib]
but you need to also use --known-64-bit-blas-indices.
<P>
MKL also ships with 64 bit integer versions of the BLAS and LAPACK, if you select those you must also ./configure with --known-64-bit-blas-indices
<P>
Developer Notes: Eventually ./configure should automatically determine the size of the integers used by BLAS/LAPACK.
<P>
External packages such as hypre, ML, SuperLU etc do not provide any support for passing 64 bit integers to BLAS/LAPACK so cannot
be used with PETSc if you have set <A HREF="../Sys/PetscBLASInt.html#PetscBLASInt">PetscBLASInt</A> to long int.
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Sys/PetscMPIInt.html#PetscMPIInt">PetscMPIInt</A>, <A HREF="../Sys/PetscInt.html#PetscInt">PetscInt</A>, <A HREF="../Sys/PetscBLASIntCast.html#PetscBLASIntCast">PetscBLASIntCast</A>()
<BR>
<P>
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>intermediate
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../include/petscsys.h.html#PetscBLASInt">include/petscsys.h</A>
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