Hi everyone,

I was wondering if there is a function in Mata that does the opposite of

You can see that neither

But I was wondering if there was direct way. If not, this workaround could be the base for a built-in method

I was wondering if there is a function in Mata that does the opposite of

**vec()**, taking the number of columns as an argument. Consider the following exampleCode:

: A = 1 , 4 \ 2 , 5 \ 3 , 6 : A 1 2 +---------+ 1 | 1 4 | 2 | 2 5 | 3 | 3 6 | +---------+ : vec(A) 1 +-----+ 1 | 1 | 2 | 2 | 3 | 3 | 4 | 4 | 5 | 5 | 6 | 6 | +-----+ : colshape(vec(A),2) 1 2 +---------+ 1 | 1 2 | 2 | 3 4 | 3 | 5 6 | +---------+ : rowshape(vec(A),3) 1 2 +---------+ 1 | 1 2 | 2 | 3 4 | 3 | 5 6 | +---------+

**colshape()**nor**rowshape()**return the original matrix. I have found the following workaround by transposing the vector into a row one and using rowshape:Code:

: a = vec(A)' : rowshape(a,2)' 1 2 +---------+ 1 | 1 4 | 2 | 2 5 | 3 | 3 6 | +---------+

**invvec()**, please?
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