Hi, Statalist:
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 ?
Thank you
Gao
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