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How to save value of find function?

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laith Farhan
laith Farhan 2018-8-3
评论： laith Farhan 2018-8-3
Dear all, How to save the value of x vector in de vector based on find function?
expected results is : de = [1 4 7 3 10 6 90 1.1 80];
x=[ 1 4 7 3 10 6 0 90 1.1 80]; for i=1:10 de = find(x > 0); end
Many thanks...

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Stephen23
Stephen23 2018-8-3
编辑：Stephen23 2018-8-3
Your loop is superfluous, get rid of it. Simpler with logical indexing:
>> x = [1,4,7,3,10,6,0,90,1.1,80];
>> de = x(x>0)
de =
1 4 7 3 10 6 90 1.1 80
https://www.mathworks.com/help/matlab/math/matrix-indexing.html
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Stephen23
Stephen23 2018-8-3
编辑：Stephen23 2018-8-3
"expected results is: [ 0 0 0 4 0 0 7 8 0 10];"
With two vectors and a times operation:
>> x = [1,4,7,3,10,6,0,90,1.1,80];
>> (1:numel(x)) .* (x<=0)
ans =
0 0 0 4 0 0 7 8 0 10
If your professor insists that you use a pointless find, then something like this perhaps:
>> idx = find(x<=0);
>> vec = zeros(size(x));
>> vec(idx) = idx
vec =
0 0 0 4 0 0 7 8 0 10

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