tmp_1(tmp_2 > 0) What does this command mean in Matlab?

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Bidisha Das
Bidisha Das 2018-7-20
回答： Image Analyst 2018-7-27
I have been given a set of matlab codes presently and asked to write them in some other language. But I cannot figure out what this statement means in matlab. To provide context, tmp_1 and tmp_2 are 2 local variables.
Thanks in advance!

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回答（2 个）

Adam
Adam 2018-7-20
tmp_2 > 0
is a logical result of the same size as tmp_2 which is true where tmp_2 is greater than 0 and false otherwise.
tmp_1(tmp_2 > 0)
uses this as a mask into tmp_1 which must be the same size and returns only those elements of tmp_1 for which tmp_2 is greater than 0.
Image Analyst
Image Analyst 2018-7-27
In another non-vectorized language, try a for loop, something like
for k = 1 : length(tmp_2)
if tmp_2(k) > 0
tmp_1(k) = whatever....
end
end
Adapt slightly for the specific language you're using.

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