hi, i want to find in a binary random matrice position of columns full of zeros (a column of zeros)..

is there any function in matlab which retur the position of a column ??

Answer 1

[Stephen23]

You can use all and find to locate columns containing only zeros:

>> X = randi(2,3,23)-1
X =
   0   0   0   0   1   1   1   0   1   1   0   0   1   1   1   1   1   1   1   1   1   0   0
   1   0   0   0   0   0   1   0   1   1   0   0   0   1   1   0   0   1   0   0   1   0   0
   0   1   0   1   0   0   1   1   1   1   0   0   0   0   1   1   0   1   0   1   1   1   0
>> find(all(X==0,1))
ans =
    3   11   12   23

[loukil sana]

hi thanks for your answer.. i have an other question please. why i can't find the boucle do...while(cond) in matlab? is there any other function to replace it?

[Stephen23]

MATLAB does not have do ... while. Use this:

while cond
    ....
end