array to matrix

Hi all,

I have an array like a:

 a=[10  20 30 40];

I want to convert it to the matrix below, without using any for loop just by one command.

 b=[ 10  10 20 20 30 30 40 40
     10  10 20 20 30 30 40 40
     10  10 20 20 30 30 40 40];

How can I do it. Thank you,

Answer 1

[Andrei Bobrov]

a = [10  20 30 40]; 
b = kron(a,ones(3,2))

Answer 2

[Titus Edelhofer]

Hi Som,

the function you are looking for is named

repmat

Titus

[Andrei Bobrov]

and 'reshape'

[Titus Edelhofer]

Hi Andrei, thanks! I admit I did not see the repetitions in the rows, so my solution would be repmat + reshape. Using kron is in this case the more elegant solution.