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Re: st: programming help


From   Seb Buechte <sfbuechte@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: programming help
Date   Tue, 22 Feb 2005 15:07:33 +0100

So would this work out to look like the following, correct?

1) attach rank vector to X an Y
2) sort X descending
3) sort Y ascending
4) Loop over the elements while Yi is greater than Xi and save the
larger values including its rank to a result matrix
5) sort the result matrix according to the ranks of its elements


On Tue, 22 Feb 2005 14:55:54 +0100, Alexandru Voicu <voicu@iza.org> wrote:
> Not really. If the ordering is important, you can attach a rank vector
> to result matrix result = rank~X, sort it according to the elements of
> x, then do the whole thing for the second column of the result matrix,
> then resort it with respect to its first column.
> 
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Seb Buechte
> Sent: Tuesday, February 22, 2005 2:51 PM
> To: statalist@hsphsun2.harvard.edu
> Subject: Re: st: programming help
> 
> I am wondering: do you need to preserve the order of elements in your
> vector(s)? In that case sorting etc. will not help and the whole problem
> remains more complex...
> 
> seb
> 
> On Tue, 22 Feb 2005 07:58:17 -0500, MITRA PINAKI  (MAR1PXM)
> <mar1pxm@ups.com> wrote:
> > Dear all,
> >
> >     I am struggling with the following problem and wondering if I can
> > get any help on this. I have two row vectors, X=(x11, x21, x31, ...,
> > xn1)' and Y=(y11, y21, y31, ..., yn1)' where n=300 (I have 300
> > elements in each of the row vectors). My problem is the following: 1)
> > I need to calculate the largest value of Y and the smallest value of
> > X. 2) If the largest value of Y is grater than the smallest value of
> > X, replace the smallest value of X by the largest value of Y. 3) At
> > the next step, ignore the previous largest value of Y and find the
> > largest from the rest of the 299 elements of Y. Also for X, find the
> > smallest value of X from the rest of the 299 elements of X and if the
> > largest value of Y is grater than the smallest value of X, replace the
> 
> > smallest value of X by the largest value of Y. 4) The loop stops when
> > the largest value of Y from the rest of Y elements is less than equal
> > to the smallest value of X from the rest of X elements. 5) Construct
> > the new X vector (X_NEW) with the new elements of Y after replacement
> > keeping the unchanged elements of X.
> >
> > My problem is that I am not able to construct the loop correctly and
> > getting no where. Thank you for your help.
> >
> > Pinaki
> >
> > _____________________________
> > Pinaki Mitra
> > UPS Capital
> > 35 Glenlake Parkway, NE
> > Atlanta, GA 30345
> > Office: (404) 828-6759; 5-490-6759 (UPS Atlas)
> > Fax:    (404) 828-6660
> > Cell:   (404) 668-6575
> > Web:   www.upscapital.com
> >
> > *
> > *   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/
> >
> 
> --
> - Seb F Buechte
> -
> - Stay in touch!
> *
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> 
> *
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> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/
> 


-- 
- Seb F Buechte
-
- Stay tuned!
*
*   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/



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