how to substitute a row vector to a column of a matrix

Hi, I have

 a=[1 2 3 4; 
    5 6 7 8;
   9 10 3 4]

 b=[4 5 7]

I want to substitute b to my second column of a to become

 c=[1 4 3 4;
    5 5 7 8;
    9 7 3 4]

what can I do?

Thanks.

Answer 1

[Jos (10584)]

   a = [1 2 3 4; 
        5 6 7 8;
        9 10 3 4]
   b = [4 5 7]

   c = a % copy a

   c(:,2) = b(:) % transform b into a column vector and replace the 2nd column of c with it

[Grace]

Hi Jos, what if i want to substitute b to second and third column of a to get

 c=[1 4 4 4;
    5 5 5 8;
    9 7 7 4]

How am I going to get that?

[Samuel Akpobome]

You can do this as follows;

c(:,2:3)=[b(:) b(:)] %this substitutes b(as a column matrix) into columns 2 and 3 (or 2 to 3) in the matrix c