reshaping matrix with odd number of total elements

how can I reshape a 63X5 matrix (315 elements) into a mX2 , and a mX4 matrix?

[Walter Roberson]

If the data were in the order

A1 B1 C1 D1 E1
A2 B2 C2 D2 E2
A3 B3 C3 D3 E3

and so on, then what would be the desired output order?

[klb]

The 65X5 matrix is all combinations of the vector [1 2 3] with replacement, which I wanted to reshape to m X 2 and m x 4 matrix and eliminate duplicates.

Another way to state problem is how would I reshape [1 2 3] in to a m X 2 and m X 4 matrix. With repetition.

 [1 2 3]
 1 1
 1 2
 1 3
 2 1
 2 2
 2 3
 3 1
 3 2
 3 3

 and 1 3 not = 3 1 etc.

Answer 1

[Walter Roberson]

https://www.mathworks.com/matlabcentral/fileexchange/7147-permn-v-n-k

[klb]

Thank you! I will come back to reshaping matrix with odd no. of elements, another time.

Answer 2

[Bruno Luong]

You can't

[Walter Roberson]

At least not without either discarding elements or padding with something.