How to normalize 60x3 vector to zero mean and unit variance

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krishnasri
krishnasri 2015-6-16
评论： Luis 2016-8-15
I have vector size of 60x3 in an excel sheet, I need to find the zero mean and unit variance of all the values in that sheet and write back the result into another excel sheet. Can u please help me in writing the code.

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Walter Roberson
Walter Roberson 2015-6-16
New_Array = (The_Array - mean(The_Array(:))) . / var(The_Array(:));
This assumes that the array as a whole is to have zero mean and unit variance, rather than each row or column to independently have zero mean and unit variance. If you want the columns done independently:
(The_Array - repmat(mean(The_Array), size(The_Array,1), 1)) ./ repmat(var(The_array), size(The_Array,1), 1);
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Luis
Luis 2016-8-15
Actually you should divide by the standard deviation (std), not the variance (var)
(The_Array - repmat(mean(The_Array), size(The_Array,1), 1)) ./ repmat(std(The_array), size(The_Array,1), 1);

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