[SciPy-user] Can't find atlas for scipy install

[Pearu Peterson]

On Sun, 13 Oct 2002, Skip Montanaro wrote:

> Did you set the ATLAS environment variable (I don't know if it looks
> in common places or if it always requires ATLAS to be set)?

(
scipy/system_info.py looks ATLAS libraries in all common places such as
/usr/lib,/usr/local/lib,/opt/lib,/usr/lib/atlas,<sys.prefix>/lib,
etc etc (but not necessary in the given order) and setting ATLAS
environment variable is *not* an requirement.

ATLAS environment variable can be useful only if
1) ATLAS is installed in a rather uncommon place,
2) or if one has different ATLAS libraries in the system and then ATLAS
environment variable can be used to specify which one scipy should use.

However, scipy/system_info.py refuses to find ATLAS libraries that are
incomplete. The definition of completness is as follows:

  The following four files

    liblapack.a, libf77blas.a, libcblas.a, libatlas.a

  must exist in the *same* directory and the size of liblapack.a should be 
  around 6MB (that is, the instructions in
    http://math-atlas.sourceforge.net/errata.html#completelp
  are succesfully applied).

If any of these conditions is unsatisfied, expect problems when importing
scipy.
)

Pearu