[Numpy-discussion] Have a problem: what is attribute 'compress'
jmiller at stsci.edu
Thu Dec 19 05:54:03 CST 2002
Sebastian Haase wrote:
>Somehow I have a problem with numarray. Please take a look at this:
I've don't recall seeing anything like this, nor can I reproduce it
now. If you've been following numarray for a while now, I can say
that it is important to remove the old version of numarray before
installing the new version. I recommend deleting your current
installation and reinstalling numarray.
compress() is a ufunc, much like add() or put(). It is defined in
ndarray.py, right after the import of the modules ufunc and _ufunc.
_ufunc in particular is a problematic module, because it has followed
the atypical development path of moving from C-code to Python code.
Because of this, and the fact that a .so or .dll overrides a .py,
older installations interfere with newer ones. The atypical path was
required because the original _ufuncmodule.c was so large that it could
not be compiled on some systems; as a result, I split _ufuncmodule.c
into pieces by data type and now use _ufunc.py to glue the pieces together.
Good luck! Please let me know if reinstalling doesn't clear up the
>>>>import numarray as na
>Traceback (most recent call last):
> File "<input>", line 1, in ?
> File "C:\Python22\Lib\site-packages\numarray\numarray.py", line 581, in
> MAX_LINE_WIDTH, PRECISION, SUPPRESS_SMALL, ', ', 1)
> File "C:\Python22\Lib\site-packages\numarray\arrayprint.py", line 163, in
> separator, array_output)
> File "C:\Python22\Lib\site-packages\numarray\arrayprint.py", line 125, in
> format, item_length = _floatFormat(data, precision, suppress_small)
> File "C:\Python22\Lib\site-packages\numarray\arrayprint.py", line 246, in
> non_zero = numarray.abs(numarray.compress(numarray.not_equal(data, 0),
>AttributeError: 'module' object has no attribute 'compress'
>The same workes fine with Numeric. But I would prefer numarray because I'm
>writing C++-extensions and I need "unsigned shorts".
>What is this error about?
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