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how to scale the array type double of range [-1,1] to [0,1] and [0,360] to[0,1]

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preet
preet on 16 Aug 2013
Commented: Walter Roberson on 28 Feb 2021
i want to scale my values which are in range of [0,360], [-1,1]to [0,1]

Answers (5)

Jan
Jan on 28 Aug 2017
Edited: Jan on 28 Aug 2017
The general method to scale any input array (vector, matrix, multi-dim array) to the range [0, 1] is:
maxV = max(V(:));
minV = min(V(:));
Vs = (V - minV) / (maxV - minV);

Jan
Jan on 16 Aug 2013
The following scales array x from any range to [0, 1]
scaled = x - min(x);
scaled = scaled / max(scaled);

Alireza Ahani
Alireza Ahani on 28 Feb 2021
check out this function. you can specify also the boundaries.
  1 Comment
Walter Roberson
Walter Roberson on 28 Feb 2021
Correct.
This function did not exist back when the question was asked, but is a useful function to know now.
In older days, the deceptively named mat2gray() function was the one to call to do the rescaling.

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Azzi Abdelmalek
Azzi Abdelmalek on 16 Aug 2013
a=-1:0.1:1
b=a-min(a)
e=max(a)-min(a)
out=b/e
% you can use the same code for all cases

Abdullah Caliskan
Abdullah Caliskan on 14 Aug 2017
Edited: Walter Roberson on 28 Feb 2021
if input is matrix, you can use this. upper, bottom
xmax =max(input);
xmin =min(input);
A=bsxfun(@minus,input,xmin);
B=bsxfun(@rdivide,A,(xmax-xmin));
cikis=B*(upper-bottom)+bottom;
  1 Comment
Jan
Jan on 28 Aug 2017
This works columnwise. I assume the min and max values should concern the complete matrix.

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