Command Line statements for a matrix

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I'm having trouble setting up this code.
My goal is to set up a 3x3 Matrix A. Then write command line statements to perform the following operations.
a) Interchange columns 2 and 3
b) add a fourth column of zeros
c) insert a row of 1's as the new second row. ( move current 2nd and 3rd rows down)
d) remove the second column
Any help would be greatly appreciated, Thanks
  3 Comments
Joseph
Joseph on 20 Mar 2014
It is hw But we are allowed to use the Matlab Forum for help as long as it is cited.
Joseph
Joseph on 20 Mar 2014
I have b) and d) completed. the other 2 are giving me problems. thanks

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Accepted Answer

per isakson
per isakson on 20 Mar 2014
Edited: per isakson on 20 Mar 2014
Ok, here is one way of doing a)
>> m = magic( 3 )
m =
8 1 6
3 5 7
4 9 2
>> m( :, [1,3,2] )
ans =
8 6 1
3 7 5
4 2 9
>>
Why don't you try to do it with the function, cat( 2, m(:,1), ... )
.
Continue:
Does "command line statements" say that each task shall be done with one function call? If two are allowed
>> m1 = m( [1,1,2,3], : )
m1 =
8 1 6
8 1 6
3 5 7
4 9 2
>> m1(2,:) = 1
m1 =
8 1 6
1 1 1
3 5 7
4 9 2
otherwise
>> cat( 1, m(1,:), ones(size(m(1,:))), m([2,3],:) )
ans =
8 1 6
1 1 1
3 5 7
4 9 2
  1 Comment
Joseph
Joseph on 20 Mar 2014
That helps a lot. Now for c), I have no problem replacing a row with 1's, but inserting and moving other rows down is giving me peroblems

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