Blas (basic linear algebra subprograms) is a set of definitions of common operations on vectors and (dense) matrices. Lapack is the linear algebra package that. Lapack is a highly optimized library of linear algebra routines written in fortran 90. These routines include matrix multiplication, factorization (lu, cholesky, qr, etc. ) least squares. Lapack builds off of blas routines to provide more complex linear algebra operations as aforementioned.
Because the blas are efficient, portable, and widely available, they are commonly used in the development of high quality linear algebra software, lapack for example. Because the blas are efficient, portable, and widely available, they are commonly used in the development of high quality linear algebra software, such as lapack. Lapack does work on top of blas. The problem is that it is designed to run on a cpu, so the various checks it does for iterative methods dont work well when its used with. Both openblas and atlas include lapack. But, if you install libblas or libgslcblas, you dont get the lapack functions. Instead, liblapack is a separate linux package compatible only with libblas. Unless there is a compelling reason to adhere to the standalone blas build, it may be advisable to consider utilizing the lapack package, whereby both blas and lapack are provided.
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