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Re: st: -syntax , option(varlist min=0)-?
Even spiffier:
program twoopts
syntax varlist , [ MYOPTion1 MYOPTion2(varlist) ]
di "varlist: [`varlist']"
di "myoption1: [`myoption1']"
di "myoption2: [`myoption2']"
if "`myoption1'"!="" local myoption `varlist'
else if "`myoption2'"!="" local myoption `myoption2'
di "myoption: [`myoption']"
end
This gives:
. twoopts mpg price
varlist: [mpg price]
myoption1: []
myoption2: []
myoption: []
. twoopts mpg price , myopt(mpg)
varlist: [mpg price]
myoption1: []
myoption2: [mpg]
myoption: [mpg]
. twoopts mpg price , myopt
varlist: [mpg price]
myoption1: [myoption1]
myoption2: []
myoption: [mpg price]
This is documented somewhere, i think....
Nick Winter
Jeph Herrin wrote:
Thanks for the tip. I knew there must be a trick somewhere.
I can even do this, no?
capture syntax varlist, myoption(varname)
if _rc {
syntax varlist, myoption
}
cheers,
J
Sergiy Radyakin wrote:
Dear Jeph,
try:
capture syntax varlist, myoption(varname)
if !_rc {
//program implementation for syntax1
....
exit
}
syntax varlist, myoption
// program implementation for syntax2
this is often used when there are several distinct syntaxes possible
for a command.
See for example the implementation of -test- in test.ado.
Best regards, Sergiy Radyakin
On Thu, Oct 8, 2009 at 2:13 PM, Jeph Herrin <[email protected]> wrote:
I would like a program to take an option which contains
either a varlist or nothing. Something like
syntax varlist..., myoption(varlist min=0)
which Stata doesn't like. The idea is that -myoption-
only applies to the listed variables in the primary varlist;
unless -myoption()- is specified, then it applies to all
variables in the primary varlist. This sounds confusing
even to me, so in pseudo code, I would like to have
myprogram var1-var10, myoption(var1)
apply the option to only -var1-, but
myprogram var1-var10, myoption
apply the option to var1-var10. Seems like I have done this
before, but it escapes me now. Any ideas?
thanks,
Jeph
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--------------------------------------------------------------
Nicholas Winter 434.924.6994 t
Assistant Professor 434.924.3359 f
Department of Politics [email protected] e
University of Virginia faculty.virginia.edu/nwinter w
PO Box 400787, 100 Cabell Hall
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