Linear Algebra BLAS/LAPACK
LAPACK is written such that the majority of the computation is performed by calls to the Basic Linear Algebra Subprograms (BLAS)
Basic Linear Algebra Subprograms (BLAS) and Linear Algebra PACKage (LAPACK)
As a consequence, you need to install BLAS before LAPACK. Download the packages from the following websites.
- BLAS: http://www.netlib.org/blas/
- LAPACK: http://www.netlib.org/lapack/
Locate BLAS Library
Check installation
The first step is to determine where is the BLAS library on your system. Use
the command locate libblas.so to find the library. If several results
are reported, look for the version usually under /usr/lib/ or
/usr/lib64 or something similar to that path. For example, on my machine
the library is located at /usr/lib/libblas.so. That location is most likely a
symbolic link to another location in your filesystem.
Compile BLAS library and manage the output
Switch to the BLAS folder and execute:
make
to compile all fortran files. After that rename the created library.
mv blas_LINUX.a libblas.a
After creating the library called libblas.a, copy that file to your library folder
by executing the following command
sudo cp libblas.a /usr/local/lib/
The above directory can be replaced by any library path in your systems. BLAS and LAPACK are then installed on your system.
When dealing with C/C++ compilation, do not forget to point out your search directory for header files with option “-I”, and add your library path with “-L” for libraries with “-l” if the search paths for the header files and libraries are not included.