location of non zeros

Hi there if I have a 100x1 matrix which has some zeros in it, how can i find the corresponding matrix of "locations" for all the cells which are non-zero.

Eg, 1, 3, 2, 0 , 2, 4, 1, 0 , 0

Output:

1, 2, 3, 5, 6, 7, ......

Answer 1

[Matt J]

     >> A=[ 1, 3, 2, 0 , 2, 4, 1, 0 , 0];

     >> locations = find(A)

    locations =

         1     2     3     5     6     7

Answer 2

[Dan Seal]

Use the logical ~= (not equal). This is not an assignment, but rather a test to see where two things are not equal to each other.

>> a = [1, 3, 2, 0 , 2, 4, 1, 0 , 0]
a =
     1     3     2     0     2     4     1     0     0
>> loc = a ~= 0
loc =
     1     1     1     0     1     1     1     0     0

http://www.mathworks.com/help/releases/R2013a/matlab/ref/ne.html http://www.mathworks.com/help/releases/R2013a/matlab/ref/relationaloperators.html