location of non zeros

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Mate 2u
Mate 2u 2013 年 7 月 9 日
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, ......

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Matt J
Matt J 2013 年 7 月 9 日
編集済み: Matt J 2013 年 7 月 9 日
>> A=[ 1, 3, 2, 0 , 2, 4, 1, 0 , 0];
>> locations = find(A)
locations =
1 2 3 5 6 7

その他の回答 (1 件)

Dan Seal
Dan Seal 2013 年 7 月 9 日
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

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