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From |
Eva Poen <eva.poen@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Maximum length of a string expression in a program |

Date |
Mon, 16 Mar 2009 09:08:08 +0000 |

Davide, the problem is in a part of your code that you are not showing. Your program, so far, does not use evaluation (the evaluating equal sign). See also here: http://statajournal.com/article.html?article=pr0045 . As soon as you manipulate `regressors' with an equal sign, the limit bites. Without it, you should be fine, as the following example shows. Eva ************************************************ capture program drop mycommand program mycommand syntax namelist [if] [in] [aweight fweight pweight] [, *] gettoken command 0 : namelist gettoken depvar regressors : 0 `command' `depvar' `regressors' `if' [`weight' `exp'] , `options' end * create 150 regressors clear set obs 5000 set seed 123 forvalues x = 1/150 { gen x`x' = invnorm(uniform()) } gen eps = invnorm(uniform()) gen y = 5 forvalues x = 1/150 { replace y = y + `x'*x`x' } replace y = y + eps * use regress regress y x* * use mycommand qui ds x* mycommand regress y `r(varlist)' ************************************************ 2009/3/16 Davide Cantoni <davide.cantoni@gmail.com>: > Dear statalisters, > > I have a question related to programming a new program/ado file. I am > encountering the problem that one of the arguments of my program might > be too long as a string, going beyond the limit of 244 characters. > Specifically, my code looks like this > > *** begin code > > program mycommand > syntax namelist [if] [in] [aweight fweight pweight], ... > > gettoken command 0 : namelist > gettoken depvar regressors : 0 > > `command' `depvar' `regressors' `if' [`weight' `exp'], ... > > ... > > end > > *** end code > > (to explain: the idea is to have a two-word command, where the second > word is a regression command built-in in Stata. So, for example, one > would run "mycommand areg y x1 x2 x3..." and then -mycommand- would > use -areg- within its routine) > > I am encountering problems when running -mycommand- with a list of > regressors that is longer than 244 characters. Then, the list is > arbitrarily truncated after that limit, which of course can create > problems. What would a savvy programmer to do avoid this problem? I > cannot imagine that any list of regressors has to be shorter than 244. > > Thanks for your help and suggestions, > > Davide * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st: Maximum length of a string expression in a program***From:*Davide Cantoni <davide.cantoni@gmail.com>

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