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From |
"Kartick Gupta" <KARTICK@mngt.waikato.ac.nz> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
Re: st: How to append a dataset using one observation only |

Date |
Fri, 16 Nov 2007 16:13:22 +1300 |

Hello Tiago, I had a same memory problem. To solve this problem, I installed -savesome- command. It is very useful when you want to save data only for a particular variable or within some observations. Once you save the relevant data in different files, you can finally recall all the files into one file by using -joinby- function. It saved a lot of memory space for me. For example savesome variable in 1/5 using xyz1 savesome variable in 1/5 using xyz2... and finally clear .... forvalues z=1/.. { joinby variable using xyz`z', unmatched(both) drop _merge } Hope it helps you. Regards Kartick >>> <tiago.pereira@incor.usp.br> 16/11/2007 3:51 p.m. >>> Dear Statalisters, Due to problems with memory, I would like to know if it is possible to append a dataset only using a specific observation. For example, suppose we have the following datasets: DATASET 01 variable1 1 2 3 4 5 6 DATASET 02 variable1 4 45 12 56 28 The objective is to add to dataset 01 only one out of 5 observations of dataset 02 without creating a tempfile. I am trying to implement tests used in genetics, in which each column is a sequence of DNA, coded as 0,1,2 and 3. It seems that Stata cannot handle well with such tests, since all memmory is rapidly consumed (~1 GB for a relatively short segment of DNA analyzed for 10 or more subjects). Why does Stata load everything into memory? All the best, Tiago * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**RE: st: How to append a dataset using one observation only***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

**st: A stata question***From:*"Leonidas Murembya" <murembya@msu.edu>

**References**:**st: How to append a dataset using one observation only***From:*tiago.pereira@incor.usp.br

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