# Finding whether the element of the array is present in the other array and finding the index value

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Ganesh Kini on 26 May 2020
Edited: Akira Agata on 27 May 2020
i have 2 arrays
p = -0.20000 -1.80000
v = 0.9000 0.30000 1.20000 1.50000 -1.80000
I have to compare both the array and finding the whether the element present in p is equal to the element present in v. It has to check each value ( negetive values also included )
if its a success then print the value and the index along it.
how to do it ?
i should get answer as -1.80000 and its index in both arrays
##### 2 CommentsShowHide 1 older comment
Ganesh Kini on 27 May 2020
Thanks

Akira Agata on 27 May 2020
Edited: Akira Agata on 27 May 2020
Just in case, let me post an example.
If you don't need to think about tolerance, intersect function also works.
% Example (desired output: [-1.8 1.2])
p = [-0.2 -1.8 1.2];
v = [0.9 0.3 1.2 1.5 -1.8];
% Soution1:
[idx,loc] = ismember(p,v); % or ismembertol, if assuming tolerance
out = p(idx);
idx_v = loc(idx);
idx_p = find(idx);
% Solution2:
[out,idx_p,idx_v] = intersect(p,v);