Dear Indranil,
As far as I know, there is no easy way to do this in Stata. You will probably need at least 1 loop to do this:
mat mat2=J(260,1,0)
local rows=0
forvalues i=1/260 {
if mat1[`i',1]==999999 {
local nrows=`nrows'+1
mat mat2[`nrows',1]=mat1[`i',2]
}
}
di "`nrows' rows updated in mat2"
- Paul
Sociology
University of Calgary
----- Original Message -----
From: Indranil Majumdar <[email protected]>
Date: Thursday, March 24, 2005 10:34 am
Subject: st: matrix question
> Hi,
>
> I have a matrix (mat1) with the following data (extract).
>
> . matrix list mat1
>
> mat1[260,2]
> ratsect cutoff
> r1 999999 3.435e-06
> r2 999999 4.572e-06
> r3 999999 6.596e-06
> r4 999999 9.606e-06
> r5 999999 .00001548
> r22 999998 5.470e-06
> r23 999998 .0000119
> r24 999998 .0000177
> r25 999998 .0000295
> r26 999998 .0000439
>
> I want to create another matrix (say mat2) with only those rows
> that have a
> particular 'ratsect' e.g. 999999
>
> I guess the command will look something like the following.
> matrix mat2 = mat1["some expression ???",2]
> I am not sure how to filter rows based on a criterion.
> Any help will be appreciated.
>
> Thanks,
> Indranil
> CreditSights. Inc,
> (212) 340-3820
>
> *
> * 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/
