kleurbleur

As the title says, I need to duplicate values within a 1 char matrix itself. 

I'm now doing it via [join] but it feels a bit of abusing the object plus I have to convert to a list and then fill a matrix before doing this.

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join

As the title says, I need to duplicate values within a 1 char matrix itself. 
So [1 2 3] to [1 2 3 1 2 3 1 2 3] etc. 

I'm now doing it via [join] but it feels a bit of abusing the object plus I have to convert to a list and then fill a matrix before doing this.

Any other methods?

As the title says, I need to duplicate values within a 1 char matrix itself. 
So [1 2 3] to [1 2 3 1 2 3 1 2 3] etc. 
I'm now doing it via [

duplicate-values-within-a-list-or-matrix

Got a tip for swapping values in a matrix as well? 

Got a tip for swapping values in a matrix as well? 
[1 2 3] -> [1 3 2]

Duplicate values within a list or matrix