MATLAB: How to repeat columns in matrix in matlab R2014b

columnsMATLABrepeat

I want to make copies for the columns for example i want to repeat the columns 4 times

    A=[0 1 2
       0 1 2
       0 1 2]
      A_new= [0 0 0 0 1 1 1 1 2 2 2 2
              0 0 0 0 1 1 1 1 2 2 2 2 
              0 0 0 0 0 0 0 0 2 2 2 2 ]

Best Answer

A_new=kron(A,[1,1,1,1])

Related Solutions

MATLAB: Rotating contourf in r2014b

Sean's right. The rotate command only works on a few types of objects, and you probably want to try hgtransform instead.

That would look something like this:

g = hgtransform
contourf(peaks,'Parent',g)
set(g,'Matrix',makehgtform('zrotate',pi/3))

MATLAB: Duplicating rows in a matrix

Try this:

M = [0 1 0 0
     0 2 0 0];
M2 = repmat(M, 1, 2);
M2 = reshape(M2', [], 4)'

producing:

M2 =
     0     1     0     0
     0     1     0     0
     0     2     0     0
     0     2     0     0

You could combine both calculations into a one-line calcualtion if you want to.

EDIT —

Generally, for ‘N’ repitions, the code becomes:

N = 4;                                  % Number Of Repititions
Mn = repmat(M, 1, N)
Mn = reshape(Mn', [], 2*N)'
producing: 
Mn =
     0     1     0     0
     0     1     0     0
     0     1     0     0
     0     1     0     0
     0     2     0     0
     0     2     0     0
     0     2     0     0
     0     2     0     0

Best Answer

Related Solutions

MATLAB: Rotating contourf in r2014b

MATLAB: Duplicating rows in a matrix

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