Thank you, Brendan and Nick,
It turned out that I had a typo with the name of one matrix. Thus, not
all the matrices in the local macro `column' were defined.
Thank you.
Gao
On 10/10/07, Nick Cox <[email protected]> wrote:
> 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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