create a matrix with existing matrix

i have a matrix with dimension

 A = M * 361

i wanted to create a matrix with size

 B = M * 3600

with this matrix A

how to do it??

also a matrix with dimension

 C = N * 900

i wanted to create a matrix with size

 D = N * 3600

how to do it?? please do reply...

with this matrix A

[ES]

say M is 10, then A has 361*10=3610 elements. and B has 3600*10=36000 elements. B has about 32000 extra spots. what do you want to but in the extra spots. If you want to pad them with zeros, use

zeros,

if you want to make B as a 'collage' of A, use

repmat.

[Elysi Cochin]

i want to use repmat... but i dont know how to do it when M value varies as you said M can be 10 or 20 or 61 and so..... please can you show me how to do it....

[ES]

C to D is straightforward since number of rows in C and D are equal, and D has 4 times the columns in C.

D=repmat(C,1,4)

[ES]

and for A to B you can use this workaround.

B=repmat(A,1,10)
B=B(:,1:3600);

I hope someone gives a straighter solution.

Answer 1

[ES]

C and D have same number of rows. Similarly A and B have same number of rows. So C to D is straightforward since number of rows in C and D are equal, and D has 4 times the columns in C.

D=repmat(C,1,4)

and for A to B you can use this workaround.

B=repmat(A,1,10)
B=B(:,1:3600);

I hope someone gives a straighter solution.

[Elysi Cochin]

thank you all for the reply....

Answer 2

[Andrei Bobrov]

One way:

newsize2 = 3600;
[i0,j0] = ndgrid(1:size(A,1),1:size(A,2));
F = griddedInterpolant(i0,j0);
[io,jo] = ndgrid(i0(:,1),linspace(1,j0(end),newsize2));
B = F(io,jo);

or

B = zeros(M,3600);
B = A(:,rem((1:size(B,2))-1,size(A,2))+1);