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

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Grace
Grace 2014-6-12
评论： Samuel Akpobome 2018-1-25
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.

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Jos (10584)
Jos (10584) 2014-6-12
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
  2 个评论
Grace
Grace 2014-6-12
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
Samuel Akpobome 2018-1-25
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

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