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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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Andrei Bobrov
am 20 Dez. 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);
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Walter Roberson
am 20 Dez. 2011
Yes! If you do not know for sure that the values are integral, then using exact comparisons will often fail.
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C.J. Harris
am 20 Dez. 2011
Using find with two return parameters might make it easier.
[row, col] = find(matrix == 90096);
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Walter Roberson
am 20 Dez. 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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