Convert a vector into a matrix (row wise)

49 views (last 30 days)
Let us assume vector A as follows:
A = [1 2 3 4; 5 6 7 8; 9 10 11 12];
I create two vectors (row wise) from this matrix as follows:
CP = randi([1 numel(A)]-1);
B = transpose(A);
C = B(1:CP);
D = B(CP+1:end);
Now, when I use reshpe function to construct a matrix as the same as A, the result is something else.
reshape([C D], 3, 4)
It seems that I need to make reshape to construct the matrix in row wise. Could you please help me?
  1 Comment
James Tursa
James Tursa on 2 Jul 2020
Can you explain what you want to get as output? I.e., show us the actual numeric output you want.

Sign in to comment.

Accepted Answer

Tommy on 2 Jul 2020
Edited: Tommy on 2 Jul 2020
From the reshape() docs, for the syntax
B = reshape(A,sz)
"The elements in B preserve their columnwise ordering from A."
If you want to "reshape" a vector so that the output matrix is filled along the rows first, you could reverse the requested dimensions in your call to reshape() and then transpose the result:
A2 = reshape([C D], 4, 3)';
I believe this could be generalized to any number of dimensions with a combination of reshape() and permute().

More Answers (0)


Find more on Matrices and Arrays in Help Center and File Exchange


Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!