showing all the elements of the answer matrix for specific result

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.

Answer 1

[Walter Roberson]

[A, B, C, D] = ind2sub( size(K), find(K < 0) );
ABCD = [A, B, C, D];
disp(ABCD)

[mehra]

Thanks for your answer. I got this Error in this command: Error using horzcat Dimensions of matrices being concatenated are not consistent. Error in Parameters1511 (line 66) ABCD = [Fr0, B, f0, B_h0];

[Walter Roberson]

One or more of your values Fr0, B, f0, B_h0 is not being drawn from the ind2sub() output.

[Walter Roberson]

You have

ABCD = [Fr0, B, f0, B_h0];

but you did not get B from the ind2sub() output. You should have used

ABCD = [Fr0, dq_q0, f0, B_h0];

[mehra]

Thanks a lot.