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

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 ??

Answer 1

[Chandrasekhar]

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]