LAPACK and BLAS Because LAPACK and BLAS routines are Fortran-style, when calling them from C-language programs, follow the Fortran-style calling conventions: • Pass variables by address, not by value. Function calls in and illustrate this. • Store your data in Fortran style, that is, column-major rather than row-major order. With row-major order, adopted in C, the last array index changes most quickly and the first one changes most slowly when traversing the memory segment where the array is stored. With Fortran-style column-major order, the last index changes most slowly whereas the first index changes most quickly (as illustrated by the figure below for a two-dimensional array).
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For example, if a two-dimensional matrix A of size m x n is stored densely in a one-dimensional array B, you can access a matrix element like this: A[i][j] = B[i*n+j] in C ( i=0., m-1, j=0., -1) A(i,j) = B((j-1)*m+i) in Fortran ( i=1., m, j=1., n). When calling LAPACK or BLAS routines from C, be aware that because the Fortran language is case-insensitive, the routine names can be both upper-case or lower-case, with or without the trailing underscore.
For example, the following names are equivalent: • LAPACK: dgetrf, DGETRF, dgetrf_, and DGETRF_ • BLAS: dgemm, DGEMM, dgemm_, and DGEMM_ See on how to call BLAS routines from C. See also the Intel(R) MKL Developer Reference for a description of the C interface to LAPACK functions. CBLAS Instead of calling BLAS routines from a C-language program, you can use the CBLAS interface. CBLAS is a C-style interface to the BLAS routines. You can call CBLAS routines using regular C-style calls.
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