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From |
Klaus Pforr <klaus.pforr@mzes.uni-mannheim.de> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: RE: strange foreach loop result |

Date |
Wed, 15 Dec 2010 18:04:42 +0100 |

<> David, I guess what you want to do is something like this: use result_pilot.dta, clear keep slope lower upper ed50 foreach var of varlist slope lower upper ed50 { if "`var'" == "slope" local myvar 1 if "`var'" == "lower" local myvar 2 if "`var'" == "upper" local myvar 3 if "`var'" == "ed50" local myvar 4 display "`var'", "`myvar'" }

You can verify this easily di slope di ed50 which is equivalent to di slope[1] di ed50[1] best Klaus Am 15.12.2010 17:53, schrieb Matthew Watt:

David, Do you get the same results if you use an "if/else if" structure instead of a pure if structure? As you have it now, each of your loop's tests is independent of the previous tests, meaning that even if `var' == slope, you test to see if `var' also equals lower, upper, and ed50. The result of this is that if `var' equals both slope and ed50, you will assign a value of 4 to slope. If you use an if/else structure, the else clause will only be tested if the "if" clause is false. Of course, you may end up with ed50 having a value of 1 if ed50 and slope are equal, should you use if/else. --Matt -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Airey, David C Sent: Wednesday, December 15, 2010 11:40 AM To: statalist@hsphsun2.harvard.edu Subject: st: strange foreach loop result . I'm getting a really strange foreach loop result I don't understand. In the first code snippet on fictitious data, I get what I want. In the second code snippit on the real data I get a strange result for when the condition: if `var' == slope local myvar 1 is evaluated when `var' is slope. It produces the result myvar==4, when it should return myvar==1. Anyone have a clue where my error is? clear set obs 10 gen a = 1 gen b = 2 gen c = 3 gen d = 4 foreach var of varlist a b c d { if `var' == a local myvar 1 if `var' == b local myvar 2 if `var' == c local myvar 3 if `var' == d local myvar 4 display "`var'", "`myvar'" } produces: a 1 b 2 c 3 d 4 use result_pilot.dta, clear keep slope lower upper ed50 foreach var of varlist slope lower upper ed50 { if `var' == slope local myvar 1 if `var' == lower local myvar 2 if `var' == upper local myvar 3 if `var' == ed50 local myvar 4 display "`var'", "`myvar'" } produces: slope 4<--weird, should be slope 1 lower 2 upper 3 ed50 4 * * 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/ This email message and any attachments are for the sole use of the intended recipients and may contain proprietary and/or confidential information which may be privileged or otherwise protected from disclosure. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not an intended recipient, please contact the sender by reply email and destroy the original message and any copies of the message as well as any attachments to the original message. http://www.mscibarra.com/legal/local_registered_entities.html * * 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/

-- __________________________________ Klaus Pforr MZES AB - A Universität Mannheim D - 68131 Mannheim Tel: +49-621-181 2801 (nachmittags) fax: +49-621-181 2803 URL: http://www.mzes.uni-mannheim.de Besucheranschrift: A5, Raum A312 __________________________________ * * 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: strange foreach loop result***From:*"Airey, David C" <david.airey@vanderbilt.edu>

**st: RE: strange foreach loop result***From:*Matthew Watt <matthew.watt@msci.com>

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