if/endif use with defined variables

[Arlindo da Silva]

On Fri, Apr 2, 2010 at 8:29 AM, Davide Sacchetti <davide.sacchetti at arpal.org
> wrote:

> operators like '>' work for just numbers, not for fields ...
> I mean: 5>4 is correct, while vmerId >= 5.0 (pay attention to the
> missing 'I' in your script) is not correct: if you want to compare
> fields to numbers use maskout function.
>
>
There is a if() function in the opengrads extensions that allow you to write
an if conditional for fields. Take a look at:

             http://opengrads.org/doc/udxt/libbjt/

Sure, you can accomplish the same with the maskout function but the if()
function is somewhat easier to read.

    Arlindo

-- 
Arlindo da Silva
dasilva at alum.mit.edu
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