[Numpy-discussion] equivalent to isempty command in matlab (newbie question)

Robert Kern robert.kern at gmail.com
Wed Dec 6 11:01:00 CST 2006

Giorgio Luciano wrote:
> Today  I've also posted a question to scipy groups because I've thought 
> I've found a solution but
> this work good
> bar(N, b1[:,0], width, color='r', yerr=binterv)
>  ############
>  s3=find(sig1[:,arange(ini,c)]<=0.001)
>  b1=b.flatten()
>  #if s3!=[]:
>  for i3 in arange(len(s3)):
>   text(s3[i3], b1[s3[i3]+ini],'***')
>  s2=find(logical_and(sig1[:,arange(ini,c)]>0.001,sig1[:,arange(ini,c)]<=0.01))
>  for i2 in arange(len(s2)):
>   text(s2[i2], b1[s2[i2]+ini],'**')
>  s1=find(logical_and(sig1[:,arange(ini,c)]>0.01,sig1[:,arange(ini,c)]<=0.05))
>  for i1 in arange(len(s1)):
>   text(s1[i1], b1[s1[i1]+ini],'*')
>  title('Plot of the coefficients of the model')
> and when i uncomment the ifs3!=[] part it does not...
> so in this case I've solve the problem.. but is there an equivalent for 
> isempty matlab command in numpy ?

Use (len(s3) != 0) instead of (s3 != []).

Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
 that is made terrible by our own mad attempt to interpret it as though it had
 an underlying truth."
  -- Umberto Eco

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