Brendan Halpin sent in one guess. I have another.
Here is your code again, set out according to my own
style prejudices:
forval svc_year = 2003/2006 {
forval svc_month = 1/12 {
foreach column in "en_clm_pay_amt pay_amt age" {
if (`svc_year' != 2003 | `svc_month' != 1) {
mat `column' = ///
(`column', `column'_`svc_year'_`svc_month')
}
}
}
}
What catches my eye are the " " in
foreach column in "en_clm_pay_amt pay_amt age"
which are not just decorative, but have syntactic
significance.
Stata has a rule: " " bind together more strongly than
spaces separate. Thus, from Stata's point of view,
"en_clm_pay_amt pay_amt age"
is _one_ word, or token, not two. So, remove the " "
and see whether the code then works.
Nick
[email protected]
Gao Liu
> I tried to join by columns some matrix stored from previous tabstat
> results using the following codes:
>
>
> forval svc_year=2003/2006 {
> forval svc_month=1/12 {
>
> foreach column in "en_clm_pay_amt
> pay_amt age" {
>
> if
> (`svc_year'!=2003|`svc_month'!=1) {
>
> mat
> `column'=(`column', `column'_`svc_year'_`svc_month')
>
> }
>
> }
>
> }
>
> }
>
> where `column' and `column'_`svc_year'_`svc_month' are matrix and have
> been given a value earlier. But when running, an error message pops
> up, indicating that " matrix operation not found, r(501); ". Can
> anybody tell me what is the wrong with the code ?
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