Extract column 1, 4-6, 8 of an 8x8 matrix

Hello everyone, I have an 8x8 matrix and and I need to extract columns 1,4-6,8 as in the matrix below:

     1     2     3     4     5     6     3     1
     1     3     5     6     8     7     1     0
     5     3     1     7     9     2     9     2
    10    61    32    45    12    62    40    51
     1     2     3     4     5     6     3     1
     1     3     5     6     8     7     1     0
     5     3     1     7     9     2     9     2
    10    61    32    45    12    62    40    51

I don't really know how to. I have being on it for a while. Please any assistance will be appreciated. Thanks

Answer 1

[Azzi Abdelmalek]

A(:,[1 4:6 8])

[VicPeters]

Azzi just so fast? Knowledge past power my brother. I have being on it for close to 5 hours now.

Many thanks once again...

[VicPeters]

Hello there I was thinking if there is a way I can randomly select columns 5 and 6 but on any row. What it means is: if for instance, column5 element is selected on a particular row, column6 element of the same row will be selected together in the 8x8 matrix above. It must be random selection. I will appreciate any assistance rendered. Thanks...

[Azzi Abdelmalek]

n=size(A,1)
out=A(randi(n),[5 6])

[VicPeters]

Thanks Azzi, I really appreciate your assistance. Its working as expected, but if I want the output to be the size of n, how can I update the code?

Many thanks, VicPeters

[Azzi Abdelmalek]

n=size(A,1)
out=A(randperm(n),[5 6])

[VicPeters]

Thanks Azzi, I don't really know how to thank you enough, you made my day! It is my prayer for you that you'll get help anytime you need one.

Thanks once again!