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RE: st: variable names in matrix


From   Stefan Pichler <stefan__pichler@hotmail.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: variable names in matrix
Date   Tue, 10 May 2011 11:19:04 +0200

Thanks for your answers. Problem solved






----------------------------------------
> Date: Tue, 10 May 2011 00:53:27 +0200
> Subject: Re: st: variable names in matrix
> From: klein.daniel.81@googlemail.com
> To: statalist@hsphsun2.harvard.edu
>
> Stefan,
>
> there are several problems with your code. Firstly,
>
> "mat A=J(1,2,.)"
>
> will not work, because in your example your matrix A has 3 rows, not
> only 1. Secondly you do not need 2 colums, because, as you have
> already pointed out, a matrix may not conatin strings. But see -help
> mat rownames- for an alternative.
>
> "scalar aaa=sum(`var')
> mat A=(A \ ??? , aaa)"
>
> will also not do what you probably expect it to do. Firstly -sum()-
> returns the runnig sum of a variable. You are probably looking for
> -total()-, an -egen- function. Secondly, within a loop you want to
> code something like
> . mat A[`i', 1] = x
>
> Please see -help matrix-.
>
> Here are two rather ad hoc solutions:
>
> /*---example 1---*/
> tempvar s
> unab vars : *
> mat A = J(`: word count `vars'', 1, .)
> mat rownames A = `vars'
> loc i 0
> foreach v in `vars' {
> qui g `s' = sum(`v')
> mat A[`++i', 1] = `s'[_N]
> drop `s'
> }
>
> matlist A
> /*---end---*/
>
> /*---example 2---*/
> mata :
> A = .
> st_view(A, ., .)
> st_matrix("A", colsum(A)')
> end
> unab nams : *
> mat rownames A = `nams'
>
> matlist A
> /*---end---*/
> *
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