Extracting Non-Zero Values From Array and Applying to a Different Matrix

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Samrita Dhindsa
Samrita Dhindsa 2018-7-10
编辑： Matt J 2018-7-10
I have two 1 x n arrays, call them p = [p_1,..., p_n] and phi = [phi_1,...,phi_n]. It is possible that p will have zero values, and I would like to extract the nonzero values into a separate array, call it workingP. At the same time, for each nonzero value p_k, I would like to include phi_k in a second new array, workingPhi.
So ultimately, I will end up with workingP = {[p_k] : p_k ~= 0} and workingPhi = {[phi_k] : p_k ~= 0} where k ranges from 1 to n.
I'm not sure how to go about this without reallocating memory over and over again.

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采纳的回答

Guillaume
Guillaume 2018-7-10
tokeep = p ~= 0; %logical array indicating which elements to keep
workingP = p(tokeep);
workingPhi = phi(tokeep);

更多回答（1 个）

Matt J
Matt J 2018-7-10
编辑：Matt J 2018-7-10
[~,idx,workingP] = find(p);
workingPhi = phi(idx);

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