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Re: st: question: mata compilation line skip rules


From   László Sándor <sandorl@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: question: mata compilation line skip rules
Date   Thu, 29 Mar 2012 16:27:12 -0400

Thanks, Maarten, this is great.

Would the lines below mean that the source I copied from Ben's
-moremata- does not compile for me for some reason?

: real colvector _mm_panels(transmorphic vector X, | real scalar np)
> {
>         real scalar i, j, r
>         real colvector res
>
>         r = length(X)
>         if (r<1) return(J(0,1,.))
>         if (args()<2) np = r
>         res = J(np, 1, 1)
>         j = 1
>         for (i=2; i<=r; i++) {
>                 if (X[i]==X[i-1]) res[j] = res[j] + 1
>                 else j++
>         }
>         if (j==r) return(res)
>         return(res[|1 \ j|])
> }

:
: *!
nothing found where subexp expected
(131 lines skipped)
-------------------------------------------------------------------------------------------------------------------------------------------------
r(3000);

What comes after this part of my code (if what crashed is already omitted) is:

*!
*! mm_callf.mata
*! version 1.0.1, Ben Jann, 16jun2006
version 9.2

local o1 "o1"
local po1 "*p.o1"
forv i=2/10 {
        local o`i' "`o`=`i'-1'', o`i'"
        local po`i' "`po`=`i'-1'', *p.o`i'"
}


On Thu, Mar 29, 2012 at 4:03 PM, Maarten Buis <maartenlbuis@gmail.com> wrote:
> 2012/3/29 László Sándor :
>> One of the biggest hints one gets when Mata does not compile is how
>> many lines were skipped. (I cannot get myself a line number with -set
>> matalnum- or -set matadebug-.)
>>
>> I could not find the documentation on the rules how this is done. How
>> could I reverse engineer which piece of my code did not compile?
>>
>> I have an ado file with multiple Mata function definitions at the end,
>> also cross-referencing to one another.
>
> One way is to open the ado file in the do-file editor and do that .ado
> file. This in essence treats the .ado file as a .do file that creates
> a (set of) program(s) and Mata functions. You usually have to first
> type -clear all- to make sure none of these aren't already in memory.
> What you are looking for are the first error messages in the Mata
> section. These are usually a pretty good indicator of where the
> problem is. The later error messages are usually just the results of
> the earlier errors and not very informative.
>
> Hope this helps,
> Maarten
>
> --------------------------
> Maarten L. Buis
> Institut fuer Soziologie
> Universitaet Tuebingen
> Wilhelmstrasse 36
> 72074 Tuebingen
> Germany
>
>
> http://www.maartenbuis.nl
> --------------------------
>
> *
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