profile.do文件如下：
set memory 50m
set matsize 2000
cd "D:\stata11\data"
adopath ++ "D:\stata11\ado\personal\base"
adopath ++ "D:\stata11\ado\personal\analysis"
local fn = subinstr("`c(current_time)'",":","",2)
local fn1 = subinstr("`c(current_date)'"," ","",3)
log using    d:\stata11\do\s`fn1'`fn'.log, text replace
cmdlog using d:\stata11\do\c`fn1'`fn'.log, replace

sysdir set PLUS     "D:\stata11\ado\plus"
sysdir set PERSONAL "D:\stata11\ado\personal"
sysdir set OLDPLACE "D:\stata11\ado"

运行adopath和di "$S_ADO"

. adopath
  [1]              "D:\stata11\ado\personal\analysis"
  [2]              "D:\stata11\ado\personal\base"
  [3]  (UPDATES)   "C:\Program Files\Stata11\ado\updates/"
  [4]  (BASE)      "C:\Program Files\Stata11\ado\base/"
  [5]  (SITE)      "C:\Program Files\Stata11\ado\site/"
  [6]              "."
  [7]  (PERSONAL)  "D:\stata11\ado\personal/"
  [8]  (PLUS)      "D:\stata11\ado\plus/"
  [9]  (OLDPLACE)  "D:\stata11\ado/"

. di "$S_ADO"
`D:\stata11\ado\personal\analysis"';`"D:\stata11\ado\personal\base"';UPDATES;BASE;SITE;
operator invalid

结果di "$S_ADO"显示有误，为什么？ 谢谢！