How to change matrix dimensions?

Hi,

I have a question regarding a 3D matrix with portfolio returns.

I have a 10000x35x12, which is 10000 simulated return paths for 35 years and 12 months in each year. Now I want to make this a 2D matrix with dimensions 10000x420 (35x12) such that the 420 months of return are in the right order. Can somebody help me with that?

Thanks in advance!

Greetz

Answer 1

[Andrei Bobrov]

M - your 3D array with size < 10000,35,12 >

out = reshape(permute(M, [1 3 2]),size(M,1),[]);

Answer 2

[Muruganandham Subramanian]

try this:

a=zeros(1000,35,12);
b=reshape(a,[1000 420]);

Answer 3

[Azzi Abdelmalek]

[n,m,p]=size(A)
b=reshape(A,n,p*m)
idx=reshape(1:p*m,m,p)'
out=b(:,idx(:))

Answer 4

[Rens]

Thanks guys! Appreciate it! All the different codes give the same return matrix so it should be alright!