Convert a vector into a matrix (row wise)

116 Ansichten (letzte 30 Tage)
Amirhossein Moosavi
Amirhossein Moosavi am 2 Jul. 2020
Bearbeitet: Tommy am 2 Jul. 2020
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 Kommentar
James Tursa
James Tursa am 2 Jul. 2020
Can you explain what you want to get as output? I.e., show us the actual numeric output you want.

Melden Sie sich an, um zu kommentieren.

Akzeptierte Antwort

Tommy
Tommy am 2 Jul. 2020
Bearbeitet: Tommy am 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().

Weitere Antworten (0)

Kategorien

Mehr zu Matrices and Arrays finden Sie in Help Center und File Exchange

Tags

Community Treasure Hunt

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

Start Hunting!

Translated by