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pythoncygwinlapackblas
sudonym
sudonym

Reputation: 4018

How to install LAPACK and BLAS using CYGWIN?

I have a use case for the pymc python module.

When doing python -m pip install pymc, I yield [Errno 2] No such file or directory "lapack/double/dpotrs.f".

When doing python -m pip install lapack, I yield No matching distribution found for lapack.

I know that I need the Intel Fortran Compiler and MS Visual Studio, according to this guide.

Because this seems non-trivial to me, I am looking for a quick & simple alternative.

How to install LAPACK and BLAS with CYGWIN?

Upvotes: 3

Views: 6991

Answers (2)

bob
bob

Reputation: 1

Another potential failure mode to watch out for, based on my own experience:

Watch out for mistakes with the PATH variable initialization from your .bashrc file.

The numpy module installation and usage depends on the PATH variable. The installation adds the subpath: '/usr/lib/lapack'

If your .bashrc file is not carefully constructed to 'ADD' subpaths to the existing PATH, an error can occur,

The result is an error during the numpy module import such that the lapack dependencies are not resolved! i.e., after the numpy install, the system should have files: /usr/lib/lapack/cygblas-0.dll AND /usr/lib/lapack/cyglapack-0.dll

If the subpath '/usr/lib/lapack' has been HOSED by your .bashrc file, the obscure loading error is reported.

Upvotes: 0

altroware
altroware

Reputation: 980

If you wish to use Cygwin, you can install python, BLAS, and LAPACK on Cygwin quite easily as "Gygwin package".

The documentation at https://cygwin.com/install.html says that you can

Run setup-x86_64.exe any time you want to update or install a Cygwin package.

Then from the installer, look for and select the entries:

  • openblas-0.2.16-1
  • lapack-3.6.0r1730-2

Do not forget to install

  • python-numpy-1.9.2-1

The installer will also add more package that are essential for those you selected. After that, you should be able to use Pymc from within the Cygwin terminal.

You do not need the Intel compiler and MS Visual Studio at all (and the link that you posted refers to something rather different than using Cygwin).

Upvotes: 3

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