showing all the elements of the answer matrix for specific result

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In my codes I have a variable (K) which is a function of 4 other variables (K(a,b,c,d)=0) which vary in defined ranges. As a result the K will be a 4 dimensional matrix.For some values k become negative,My question is how can I write a command that shows the values of the variables which make k negative.

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Walter Roberson
Walter Roberson am 21 Nov. 2016
[A, B, C, D] = ind2sub( size(K), find(K < 0) );
ABCD = [A, B, C, D];
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