st: RE: Integer program arguments not interpreted as integers (macro expansion question)

[Joe Canner <jcanner1@jhmi.edu>]

Ryan,

When you call your program you should not use parentheses:

. timer_start  99

When you call your program with parentheses, your program interprets the first argument as "(99)" and that doesn't work with -timer on-.  (You can do -set trace on- to see this.)  In the macro assignment the parenthesis are dropped in the interpretation of the argument as a number. You can remove the "macro insanity" line if you call it without the parentheses.

You call Mata functions with arguments in parentheses, which may be what you were thinking of.

Regards,
Joe Canner
Johns Hopkins University School of Medicine

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Ryan Turner
Sent: Friday, September 13, 2013 11:47 AM
To: statalist@hsphsun2.harvard.edu
Subject: st: Integer program arguments not interpreted as integers (macro expansion question)

Dear Statalist:

I avoid asking beginner questions on the list because I don't want to waste people's time (and I, ahem, don't consider myself a beginner); but can somebody explain this macro insanity below?  I know _what_ I did (used an equal sign to force an arithmetic reassignment to the first program argument), but I do not understand _why_ it is necessary (why a macro, not being in double quotes, is not interpreted as an integer when clearly an integer is the only thing that makes sense here).

The purpose of this program is to quietly get timer parameters into the return variables (e.g., for -display r(t1) r(nt1)-).  Admittedly it only saves one line of code (I don't need to call -timer list- after -timer on #-) but it is (severally) in the middle of a large program.

Best,
Ryan


capture program drop timer_start
program timer_start
    quietly {
        local 1 = `1' // macro insanity
        timer on `1'
        timer list
    }
end

capture program drop timer_stop
program timer_stop
    quietly {
        local 1 = `1' // macro insanity
        timer off `1'
        timer list
    }
end

// Call it with:
timer clear
timer_start(99)
return list

sleep 2000
timer_stop(99)
return list


--
Ryan J. Turner <rjturner@cmu.edu>
Engineering and Public Policy
Carnegie Mellon University
+1-412-304-5014 (C) | +1-484-483-3244 (GV)


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