Re: removing columns

[Francesco Potortì]

>              I have a matrix of which all elements in some columns are
>zeroes.  Is there any trick to remove this columns
>and form a new matrix

octave> a=rand(5)>0.8
a =

   0   0   0   0   0
   0   0   1   0   0
   1   1   0   1   0
   0   0   1   1   0
   0   0   0   0   0

octave> a(:,!any(a))=[]
a =

   0   0   0   0
   0   0   1   0
   1   1   0   1
   0   0   1   1
   0   0   0   0

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