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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>
PetscBLASIntCheck(a) 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.
<P>
<A HREF="../Sys/PetscBLASInt.html#PetscBLASInt">PetscBLASInt</A> b = PetscBLASIntCast(a) 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
<P>
Developer 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]
for example, you can change the int below to long int. Since MATLAB uses the MKL (Intel Math Libraries) it is likely one can
purchase a 64 bit integer version of the MKL and use that with a <A HREF="../Sys/PetscBLASInt.html#PetscBLASInt">PetscBLASInt</A> of long int.
<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>
<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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