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st: mata: Colon operators result in matrix output to screen?

From   Thomas Masterson <[email protected]>
To   [email protected]
Subject   st: mata: Colon operators result in matrix output to screen?
Date   Mon, 03 Dec 2007 11:03:35 -0800

A mata question: when I use the function affinity() [code below]
I get the results I expect, but the colon comparison operations
result in the resulting matrix being written to the Stata results
window [quite a nuisance for logging purposes]. Any thoughts why
this happens?


real colvector affinity(real rowvector ai, real matrix aj, real 
rowvector sd) {
   real matrix aij, upper, lower

   aij = J(rows(aj), 1, 0)
   upper = J(rows(aj), cols(aj), 0)
   lower = J(rows(aj), cols(aj), 0)

   upper = aj
   printf("upper has %4.0g columns and %9.0g rows\n", cols(upper), 

   lower = aj

   // These two operations print out the entire resulting matrix to the 
   upper:<= ai+sqrt(sd)
   lower:>= ai-sqrt(sd)

   upper:& lower

   aij = rowsum(upper)
   printf("aij has %4.0g columns and %9.0g rows\n", cols(aij), rows(aij))

   Thomas Masterson
   Research Scholar
   Distribution of Income and Wealth Project
   Levy Economics Institute of Bard College
   Annandale-on-Hudson, NY  12504
   (845) 758-7715

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