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From |
"Martin Weiss" <martin.weiss1@gmx.de> |

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

Subject |
AW: st: Extracting scalar from a vector |

Date |
Wed, 7 Oct 2009 20:31:05 +0200 |

<> The -local- is redundant, then (as is the stepsize "(1)" ): ************* forval i = `=x[1]'/16 { ************* Just out of curiosity, John: You -keep- observations for state 6 first time through the loop. In the second round, you tell Stata to -keep- observations for state 8. How is that possible without somehow restoring the original data? HTH Martin -----Ursprüngliche Nachricht----- Von: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von John Pfaff Gesendet: Mittwoch, 7. Oktober 2009 18:35 An: statalist@hsphsun2.harvard.edu Betreff: Re: st: Extracting scalar from a vector Thanks--that worked perfectly! >>> Jeph Herrin <junk@spandrel.net> 10/07/09 12:21 PM >>> If I understand correctly, -x- is a variable that is constant across each value of -state-. In that case foreach s in 6 8 17 21 { keep if state == `s' local start=x[1] forval i = `start' (1) 16 { .... } } should do it. hth, Jeph John Pfaff wrote: > Thanks to those who helped me with my question yesterday. One more quick question after that. > > I'm trying to extract a scalar value from a vector and use it in a forval loop. The code I have is this: > > foreach s in 6 8 17 21 { > keep if state == `s' > forval i = XXX (1) 16 { > .... > } > } > > It's the XXX that is the problem. I have a vector x that takes on different values for each state s, and I want the forval loop to run from that value to 16. In other words, x == 14 when s == 6, x == 10 when s == 8, and so on. But I have a lot of observations per state, so while x is constant for each state it is still a vector. How do I extract its scalar value to insert where the big XXX is in my code? This seems like it should be simple, but I've been thwarted for a while now. > > Thanks so much! > > All the best, > > John Pfaff > > * > * 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/ * * 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/

**References**:**Re: st: Extracting scalar from a vector***From:*"John Pfaff" <jpfaff@law.fordham.edu>

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