Is there any way to normalize any matrix values to be between (-1) and (1)?

Hello,

Is there any way to normalize any matrix values to be exactly between (-1) and (1)? I attached the matrix.

regards,

Answer 1

[Image Analyst]

You can use mat2gray(), which normalizes data from 0-1 then just scale and subtract 1 to get into the range -1 to +1:

M = 2*mat2gray(M)-1;

A nice single-line solution.

[Sarah A]

Thank you for your answer but I meant the value x should be (-1<x<1 ) not (-1<=x<=1).

[Walter Roberson]

M = (2*mat2gray(M)-1) * (1-eps);

the 1-eps contracts from [-1 1] to [-(1-eps) +(1-eps)] which is (-1, 1) to within double precision.

[Sarah A]

No it is still between -1.0000 and 1.0000, is there any way to fix that ?

[Walter Roberson]

They would display as -1.0000 and 1.0000 especially with short format in effect, but if you take 1-max(M(:)) and min(M(:))+1 then you will see non-zero residues.

Answer 2

[madhan ravi]

a=-1;
b=1;
N=100; % number of points
A=(b-a).*rand(N,1)+a; % creates numbers inbetween -1 and 1

https://www.mathworks.com/matlabcentral/answers/196798-how-to-normalize-values-in-a-matrix-to-be-between-0-and-1#answer_174487

[Sarah A]

Thank you for your answer. I tried all of them but it doesnt work.

Answer 3

[Steven Lord]

Use the normalize function with the 'range' method if you're using release R2018a or later.