John Antonakis <John.Antonakis@unil.ch>:
You might also want to step through various conditions and then issue
a more informative error message at the end, e.g. consider adapting
this approach:
cap prog drop john
prog john, rclass
version 12
loc err 0
args no_vars df N chi
loc w: word count `no_vars' `df' `N' `chi'
if `w'>4 {
loc err 1
di in red "More than 4 arguments given"
}
foreach v in no_vars df N chi {
cap confirm integer number `=``v'''
if _rc!=0 {
loc err 1
di in red "Arguments must be integers."
}
else if ``v''<0 {
loc err 1
di in red "Arguments must be positive integers."
}
}
if `err'==1 {
di in red "Please enter data after the command" _c
di in red " john as follows: vars df N chi"
exit 198
}
end
On Thu, Mar 21, 2013 at 5:49 PM, daniel klein <klein.daniel.81@gmail.com> wrote:
John,
I think I would address this with something like this
cap pr drop john
pr john
vers 12.1
args a b c d
if !inrange(`: word count `0'', 1, 4) {
di as err "Please enter data after " ///
"the command john as follows: vars df N chi"
e 198
}
numlist "`0'" ,int r(>0)
end
Best
Daniel
--
Hi:
I am writing a program and would like Stata to return an error if an
argument is missing or there are too many of them.
For example, if an argument is not an integer, the below will return an error:
program define john, rclass
version 12
args no_vars df N chi
if `no_vars'<0 | `df'<0 | `N'<0 | `chi'<0 {
di in red "You have to use integers."
exit 498
}
end
Now, how do I make Stata display:
di in red "Please enter data after the command john as follows: vars df N chi"
.....in cases where (a) there is a missing value (i.e., the user
missed putting 4 numbers) and (b) if the user provides too many
numbers (i.e., 5 instead of 4).
*
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