How could I recreate the find function

2016 10 30
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更新时间：2016 10 30
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I need to find values in a matrix that equal a given value (10), but I need to know their index/position in the matrix (won't use find function).
so if the matrix a = [2 10 10 5 7 4 10] I want to run my function and get ans = [2 3 7] to find where the 10's are in the first function

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回答（1 个）

Star Strider
Star Strider 2016-10-30

0 个投票

One approach:
a = [2 10 10 5 7 4 10];
idx = ((a == 10).*[1:numel(a)]);
idx(idx > 0)
If you want to use this with a matrix, you will need to use the reshape function to convert it to a linear vector, and then the ind2sub function to get the row and column indices.

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