Matrix in matlab equation

A = 1*1000 matrix

I need another matrix Y which has all the rows as A

Y = 1000*1000 matrix

How to do that??

Answer 1

[Torsten]

Y = repmat(A,1000,1)

[Amy Topaz]

Thank you

What about when Y has all columns as A?

[Torsten]

My guess is that you mean

Y = repmat(A.',1,1000)

Since the columns of A have 1 element and those of Y have 1000 elements, Y cannot have all its columns as A.

Answer 2

[John D'Errico]

An alternative to repmat is to use a dot product (if you are an old APL person like me, then the phrase "outer product" will come to mind.) Thus, if A is a 1x1000 vector, then

B = ones(1000,1)*A;

B will be a matrix that has rows identical to A, with 1000 copies thereof.

Similarly, if you instead want columns that are copies of the row vector A, you can do this:

C= A.'*ones(1,1000);

C will be a 1000x1000 matrix, with columns given as A, and 1000 such columns.

Note my use of the .' operator there, since if you use the ' operator instead, then it will form the conjugate transpose if A had any complex or purely imaginary elements.

[Amy Topaz]

Thank you