Normalizing data

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John
John 2011-12-21
评论： Nikhil Jahagirdar 2019-4-10
Hi there,
How would you normalize a column of data in matlab between 0 and 1 using the formula, z = (x-mean)/standard deviation. Is there a built in function to do this?
Many thanks
John
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Merhan Ahmed
Merhan Ahmed 2017-1-25
zscore function could be used as Z = zscore(X)

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采纳的回答

Junaid
Junaid 2011-12-21
Dear John,
Lets say you have matrix D and you want to normalize each value of Column to unit length (between 0-1). One possible way is :
D = bsxfun(@rdivide,D,sum(D));
each column will be unit normalized. If you take the sum of each column it will be one.
sum(D)
Do let me know if I understand you correct.
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bym
bym 2011-12-23
zscore from the statistics toolbox does (x-mean)/standard deviation

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更多回答（3 个）

Jurgen
Jurgen 2012-11-18
Dividing by the maximum does not correct for offset. So only ranges 0-X go to 0-1. If his column has a negative or nonzero minimum it won't normalize to 0-1.
While the formula for correcting this is simple, mat2gray will normalize to 0-1 for you:
for i = 1:ncol
D(:,i) = mat2gray(D(:,i))
end
You have to decide if you need to normalize before or after your calculation.
VoyageR
VoyageR 2016-11-3
Also don't forget to set your data as double otherwise you will only have 1 or 0 in your normalized vector ; )
double(vectorOfIntergers)
marwa el-hossary
marwa el-hossary 2018-5-7
plz, how can I normalize data of matrix 1x256000 between -0.5 and +0.5 by matlab code
  2 个评论
Steven Lord
Steven Lord 2018-5-7
Use the normalize function with the 'range' method and a methodtype input.
Nikhil Jahagirdar
Nikhil Jahagirdar 2019-4-10
Does it support MAtlab R2016b?

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