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

[Phil Schumm <pschumm@uchicago.edu>]

On Dec 3, 2007, at 1:03 PM, Thomas Masterson wrote:
> 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?

You need to assign the result to something -- otherwise (like other  
Mata operators) the result is printed to the screen:


: foo = (1,2,3)

: foo :<= 2
       1   2   3
    +-------------+
  1 |  1   1   0  |
    +-------------+

: foo = (foo :<= 2)

: foo
       1   2   3
    +-------------+
  1 |  1   1   0  |
    +-------------+


Also, be aware of the order of operations.  The operators :<= and :>=  
both have higher precedence than either + or -, which means that you  
may need to use parentheses.


-- Phil

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