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From |
Akshay SHanker <ashanker@optusnet.com.au> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: STATA loop terminating over missing variables |

Date |
Thu, 04 Dec 2008 12:24:50 +1100 |

Thanks for this, this seems to work. I have an extension to the question, suppose i have the following loop: forvalues i =1/49{ forvalues j=1/13{ forvalues k=1/49{ forvalues m =1/13{ capture gen mindiff`i'_`j'__x_`k' = min(capture diff`i'_`j'__`m'_`k') } } } } I am trying to get the min of diff for a particular i,j and k over a list of m. Now again not all diff`i'_`j'__`m'_`k' exist, so while the capture allows the loop to keep running, the min function does not work unless all the specified variables exist. Is there any way around this? I could just generate missing vars for every diff`i'_`j'__`m'_`k' but that would be about .5. million vars - not possible. Thanks again, this is very helpful! Akshay On 2/12/08 1:15 AM, "Nick Cox" <n.j.cox@durham.ac.uk> wrote: > The original question seems backwards. The purpose of the loop as > written is to create (e.g.) mindiff1_2 from mindiff1 and mindiff_2, so > that far from being a problem, the prior non-existence of mindiff1_2 is > expected. Perhaps the questioner meant that some of the > mindiff1-mindiff15 may not exist, in which case a better syntax is (as > indicated by Maarten) > > forval i = 1/15 { > forval j = 1/15 { > capture gen mindiff`i'_`j' = mindiff`i' - mindiff`j' > } > } > > Note correction of typo ``i' to `i'. > > Nick > n.j.cox@durham.ac.uk > > Maarten buis > > --- Akshay SHanker <ashanker@optusnet.com.au> wrote: >> I am running the following simple loop which i need some help with: >> >> forvalues i =1/15 { >> forvalues j=1/15{ >> gen mindiff`i'_`j' = mindiff``i' - mindiff`j' >> } >> } >> >> The problem is that not all combinations of i and j exist , so for >> example mindiff1_2 may not exist. Everytime the loop goes over such a >> variable, the loop terminates and thus stops running the loop over >> all consecutive variables which may exist. How do i stop the loop >> from terminating? > > see: -help capture- > > > * > * 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/ * * 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/

**Follow-Ups**:**RE: st: STATA loop terminating over missing variables***From:*"Kieran McCaul" <kamccaul@meddent.uwa.edu.au>

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