how to fill matrix without using for loop?

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Carlos Oliveira
Carlos Oliveira 2013-11-11
回答： Carlos Oliveira 2013-11-11
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

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采纳的回答

Dale
Dale 2013-11-11
编辑：Dale 2013-11-11
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)

更多回答（2 个）

Wayne King
Wayne King 2013-11-11
编辑：Wayne King 2013-11-11
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;
Carlos Oliveira
Carlos Oliveira 2013-11-11
Thank you Dale. :)

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