how to fill matrix without using for loop?

a=zeros(24,4); b=ones(24,1);

Why does not this work?

a(:,1:end)=b(:)

Subscripted assignment dimension mismatch.

Does anyone know where I am going wrong? bold

Answer 1

[Dale]

Are you trying to replicate b through A? In which case use the repmat function:

A = repmat(b,24,1)

Edit: Just realised that b is a column, so it should be A = repmat(b,1,4)

Answer 2

[Wayne King]

because b isn't the right size. b is 24x1 but you are trying to fill all 4 columns of a

How about just

a = ones(24,4);

or if you really want to "fill" starting with zeros.

 a = zeros(24,4);
 b = ones(24,1);
 b = repmat(b,1,4);
 a = b;

Answer 3

[Carlos Oliveira]

Thank you Dale. :)