how to find n values that are closest to zero

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studentambitious
studentambitious 2016-4-26
评论： studentambitious 2016-4-27
I have a matrix of 50 x 50 with floating point values both positive and negative signs...i want to find n values lying on both sides that are closest to zero along with their indices ... please help

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Azzi Abdelmalek
Azzi Abdelmalek 2016-4-26
编辑：Azzi Abdelmalek 2016-4-26
Look at this example: A is a matrix 5x5 and n=2
A=rand(5)-0.5
n=2
[~,idx]=sort(abs(A(:)))
B=A(idx)
[ii,jj]=ind2sub(size(A),idx(1:n))
out=[B(1:n) ii jj]
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studentambitious
studentambitious 2016-4-27
can we replace ~ in line [~, idx]=sort(abs(A(:))) with some other name???? how this NOT (~) symbol works here

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