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re: Re: st: Code from Stata Journal


From   Christopher Baum <kit.baum@bc.edu>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   re: Re: st: Code from Stata Journal
Date   Sun, 30 Oct 2011 10:17:54 -0400

<>
There is indeed a typographical error in the rendering of compound double quotes on pp. 613, repeated on p. 615, of the Gould "Mata matters: file processing" article in the SJ 9:4 PDF. The original code works, no doubt (although annoyingly it is not downloadable from the SJ site), but in typesetting a couple of characters were mangled.

The issue here is that the sprintf function needs to put quotes around the string scalars in its output, but not quote the real scalars (numbers). The typo is that the first character of the first argument should be the `, which you usually use on the left side of a local macro dereference, and the last character should be the ', usually ending a local macro dereference.  The digraphs `" and "' (accent grave - quotation) and (quotation - apostrophe) are known as compound double quotes, and are needed to quote a string that itself contains quotes.

This code works:

clear all
mata:
void function pp(
        string scalar sname,
        string scalar date,
        string scalar time,
        real scalar temp,
        string scalar wind,
        real scalar speed
)
{

st_local("line", sprintf(`""%s" "%s %s" %g "%s" %g"' , sname, date, time, temp, wind, speed))
}
end

mata: pp("brighton","20111030","1009",42,"ne",5)
di `"`line'"'

Kit Baum   |   Boston College Economics & DIW Berlin   |   http://ideas.repec.org/e/pba1.html
                             An Introduction to Stata Programming  |   http://www.stata-press.com/books/isp.html
  An Introduction to Modern Econometrics Using Stata  |   http://www.stata-press.com/books/imeus.html


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