Display only positive values

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Kat
Kat on 28 Sep 2019
Commented: Star Strider on 28 Sep 2019
Hello. I am trying to display only the positive values of a vector by using the find function to find where the negative values are first and then displaying only the positive values. I have tried using i = find(vector<0) but I don't know how to only delete the negative values using the find function to display only the positive values. Thanks.

Accepted Answer

Star Strider
Star Strider on 28 Sep 2019
Yolu can simply use logical indexing for this, find is not absolutely necessary.
However, if you want to use find, assign its output to a variable:
idx = find(vector>0);
PosVals = vector(idx);
Testing for the negative values and then eliminating them requires an extra step:
idx = find(vector<0);
posidx = setdiff((1:numel(vector)), idx);
PosVals = vector(posidx)
Experiment to get different results.
  2 Comments
Kat
Kat on 28 Sep 2019
Is there a way to do that without using any other built-in functions? Thanks.
Star Strider
Star Strider on 28 Sep 2019
Yes. Just test for positive values and return those indices. If you want to test for negative velues, use logical indexing and the logical negation (~) operator:
Lneg = vector < 0; % Logical Vector Of Elements < 0
Lpos = ~Lneg; % Logical Vector Of Elements >= 0
Then use find with those if you want to.

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