# How to calculate zero mean and unit variance for entire vectors in a folder?

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krishnasri el 29 de Jun. de 2015
Comentada: Image Analyst el 29 de Jun. de 2015
I am supposed to calculate zero mean and unit variance for a vector.These vector values are present in excel sheet.There are many such excel sheets in a folder, for all these excel sheets containing data for which I need to find out zero mean and unit variance are present in a folder. How can I write the code to calculate zero mean and unit variance for all these vectors in a folder at a time. Can u please help me with the code
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### Respuestas (1)

Thorsten el 29 de Jun. de 2015
1. Determine all excelfiles in the folder (hint: d = dir(',', '*.xls'))
2. loop over all these files and
4. compute mean and variance (hint: m = mean(D(:)), v = var(D(:));
5. exit loop if m == 0 && v == 1, in this case disp('found') (hint: break)
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Greg Heath el 29 de Jun. de 2015
help zscore
doc zscore
help mapstd
doc mapstd
Hope this helps.
Thank you for formally accepting my answer
Greg
Image Analyst el 29 de Jun. de 2015
Greg, you put this in a comment, not an Answer so it can't be accepted. You should move it to an Answer.
krishnasri, you might find these entries in the FAQ helpful:

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