MATLAB: How to scale/normalize values in a matrix to be between -1 and 1

Question

I found the script that scale/normalize values in a matrix to be between 0 and 1

I = [ 1 2 3; 4 5 6]; % Some n x m matrix I that contains unscaled values.

scaledI = (I-min(I(:))) ./ (max(I(:)-min(I(:))));

min(scaledI(:)) % the min is 0

max(scaledI(:)) % the max 1

Was wondering if anyone could help me normalize values in matrix between -1 and +1 Thanks

Answer 1

Once you have your result:

 scaledl = scaledl.*2 - 1;

Or directly:

 result = -1 + 2.*(data - min(data))./(max(data) - min(data));