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add columns (as operations of original colms) at specific intervals in array w'out overwriting original colms

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prerna kaul
prerna kaul on 21 Mar 2014
Closed: MATLAB Answer Bot on 20 Aug 2021
Hello,
i am a new student in matlab , i need a help
i have a array named " train_data " of size m x n (having m attributes and n examples)
i want to add "two" corresponding columns to each n columns of train_data
just for example:
0.0937 -0.0227 -0.0904 -0.0852 -0.0887
0.1397 -0.0505 0.0211 0.0095 -0.0267
0.0627 -0.0356 0.2087 -0.0134 0.0020
5 columns here , and i want 15 columns
no change in 1st col , multiply it with 2 ,multiply it with 4 and add them in next two columns respectively
do same for all the columns
how this can be done with m x n array ??

Answers (1)

Chandrasekhar
Chandrasekhar on 21 Mar 2014
A = [0.0937 -0.0227 -0.0904 -0.0852 -0.0887
0.1397 -0.0505 0.0211 0.0095 -0.0267
0.0627 -0.0356 0.2087 -0.0134 0.0020]
then
A = [A(:,1) A(:,1)*2 A(:,1)*4 A(:,2) A(:,2)*2 A(:,2)*4 ....... A(:,5) A(:,5)*2 A(:,5)*4]

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