[SciPy-user] Newbie question about boolean condition argument
Giorgio Luciano
giorgio.luciano at chimica.unige.it
Wed Dec 6 04:31:14 CST 2006
Sorry for the newbie question, but I'm struggling with the las lines of
my matlab code for a regression methods (99% finished) to convert then
it in numpy/scipy
here they are (matlab code)
s2=find(sig(:,in:c)>0.001&sig(:,in:c)<=0.01)
if s2~=[]; % for Matlab 7 use if not(isempty(s2));
the first problem is that the command find (and also where) does not
support a logicla operator as condition :(
because
s2=find(sig(:,in:c)>0.001) works..
but s2=find(sig(:,in:c)>0.001&sig(:,in:c)<=0.01)
give me an error like this
Traceback (most recent call last):
File "<pyshell#66>", line 1, in -toplevel-
s3=find(sig1[:,arange(ini,c)]>0.001 and sig1[:,arange(ini,c)]<=0.00 )
ValueError: The truth value of an array with more than one element is
ambiguous. Use a.any() or a.all()
I've read all the manual about difference in logical and bitwise
operation... tried with different parenthese, using AND or logical_and,
& etc. but I didn' manage to do it.
The second question is...(already solve) does it exist a command like
(isempty) in scipy/numpy
I used if s2 !=[] ant it worked perfectly, I was just curious to know
if the command existed :)
Thanks to all and sorry for the easy question (I've searched in the faq,
and manual before posting but found nothing)
Giorgio
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