Squeezing a two-dimensional array into a one-dimensional array without using a FOR loop

Hi,

I would like to be able to squeeze a two-dimensional array into a one-dimensional array. Basically, I would like to be able to "erase" the rows of a two-dimensional array. Is there a straight forward way to do this?

As a simple example, suppose that I have an two-dimensional array A:

A=[1 2 3 4; 5 6 7 8; 9 10 11 12];

I would like to have a function that will produce the following one-dimensional array B:

B=[1 2 3 4 5 6 7 8 9 10 11 12];

I can do the following:

A=[1 2 3 4; 5 6 7 8; 9 10 11 12];
B=zeros(1,size(A,1)*size(A,2));
k=1;
for i=1:size(A,1)
    for j=1:size(A,2)
        B(k)=A(i,j);
        k=k+1;
    end
end

which I think is a correct algorithm. But, is there a better way to do this, perhaps without using a FOR loop?

Thank you very much for your time.

Andrew DeYoung

Carnegie Mellon University

Answer 1

[Paulo Silva]

doc reshape

A=[1 2 3 4; 5 6 7 8; 9 10 11 12]
reshape(A',1,numel(A))

Answer 2

[Viraj]

A=[1 2 3 4; 5 6 7 8; 9 10 11 12];

B=zeros(1,size(A,1)*size(A,2));

k=1;

for i=1:size(A,1)

for j=1:size(A,2)

B(k)=A(i,j);

k=k+1;

end

end