The Code to replace non-threshold indexes in Array

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DB 2024-10-14
回答： Steven Lord 2024-10-14
Hello,
A = randi(5,5);
idx = find(A > 3);
A(idx) = log10(A(idx));
After running the above lines of code, what's the easiest(fastest) way to replace the non idx index in A with a certain value(100 for example)?
A(~idx) = 100; doesn't work the way I intended to.
Thanks!

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采纳的回答

Steven Lord
Steven Lord 2024-10-14
Ran in:
Get rid of the find call.
A = randi(5,5)
A = 5×5
5 3 2 2 5 1 1 4 5 3 1 4 2 5 2 1 2 3 2 2 1 1 2 5 3
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idx = (A > 3) % Make a logical mask
idx = 5x5 logical array
1 0 0 0 1 0 0 1 1 0 0 1 0 1 0 0 0 0 0 0 0 0 0 1 0
A(idx) = log10(A(idx)) % Use the logical mask to identify locations to change
A = 5×5
0.6990 3.0000 2.0000 2.0000 0.6990 1.0000 1.0000 0.6021 0.6990 3.0000 1.0000 0.6021 2.0000 0.6990 2.0000 1.0000 2.0000 3.0000 2.0000 2.0000 1.0000 1.0000 2.0000 0.6990 3.0000
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A(~idx) = 100 % Use the negation of the logical mask to identify locations to change
A = 5×5
0.6990 100.0000 100.0000 100.0000 0.6990 100.0000 100.0000 0.6021 0.6990 100.0000 100.0000 0.6021 100.0000 0.6990 100.0000 100.0000 100.0000 100.0000 100.0000 100.0000 100.0000 100.0000 100.0000 0.6990 100.0000
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