matrix
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if i want to find the index of certain value in 2D matrix, how can I find that? e.g: I have a 300x300 matrix. There is a value 90096 in that matriz. I want to find its index. Please show me the code.
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Accepted Answer
Andrei Bobrov
on 20 Dec 2011
A =[ 191 23 37 34 154
212 66 228 99 9
30 128 224 215 199
214 225 114 186 219
148 226 188 225 159];
a = 224;
[i1,j1] = find(abs(A-a) < 100*eps);
2 Comments
Walter Roberson
on 20 Dec 2011
Yes! If you do not know for sure that the values are integral, then using exact comparisons will often fail.
More Answers (2)
C.J. Harris
on 20 Dec 2011
Using find with two return parameters might make it easier.
[row, col] = find(matrix == 90096);
3 Comments
Walter Roberson
on 20 Dec 2011
Probably the value in the matrix was not _exactly_ 90096
http://matlab.wikia.com/wiki/FAQ#Why_is_0.3_-_0.2_-_0.1_.28or_similar.29_not_equal_to_zero.3F
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