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Normalize/scale in range

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Pete
Pete 2019-10-16
回答： Kaashyap Pappu 2019-10-21
hi all,
I would like to normalize values in a 18x17 matrix to have values between -1 and 1.
I would also like to be able to say that 0 = 76 mm, -1 = 71 mm, 1 = 81 mm for example instead of just using the min and max values in the array.
Any help would be greatly appreciated!
  1 个评论
dpb
dpb 2019-10-16
You can't do both unless the min/max are <= the chosen min/max.
NB: if you do choose the above three points the scaling between negative and positive results will be skewed by a significant amount -- double, in fact.
But, it's simply solving for the linear coefficients between the two...or you could use interp1

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Kaashyap Pappu
Kaashyap Pappu 2019-10-21
The code below can help perform matrix normalization where you have to specify the appropriate -1, 0 and 1 values in variables "pointZero", "pointPositive" and "pointNegative". Any value lower than -1 is set to -1 and any value greater than one is set to 1.
Assuming "a" is your matrix,
a = (a - pointZero)/(pointPositive-pointNegative);
a(a<-1)=-1;
a(a>1)=1;
Note that the points raised by dpb are valid and could affect the properties of the values in the matrix.
Hope this helps!

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