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Normalize specific data in a table

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Joe Sun
Joe Sun 2017-5-22
评论： atiqah ghaffar 2018-12-5
I have a set of data (call it 'dataset') which is 20*20 table(actually it is very large). I have converted the table to be matrix and used 'normc' function to do the normalization (preprocessing). My question is normc change all the value of the whole dataset, but the first and the last column is the ID and predict output of the dataset, they should not be change. How can I normalize data without changing the first and last column?(I'm a matlab beginner)

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Guillaume
Guillaume 2017-5-22
You can work directly on the table using, for example, varfun:
yourtable(:, 2:end) = varfun(@normc, yourtable, 'InputVariables', 2:width(yourtable)) %normalise every column but first.
Or using simple indexing, convert only the portion you want to a matrix and store back into the table:
yourtable{:, 2:end} = normc(yourtable{:, 2:end}) %normalise everything but 1st column
  2 个评论
Joe Sun
Joe Sun 2017-5-22
Thank you very much! It is great! I can continue my working now, thank you again
atiqah ghaffar
atiqah ghaffar 2018-12-5
Thank you! i've been working this for too long now i can proceed to the next step. Thank you :')

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