David,
"include" takes a copy of the specified file and makes it a part of the
current file, regardless of any surrounding conditional statements. (It's
like a "macro" in programming languages.)
To get the effect you want, write
if (time >= 2) then {
commands process.run;
}
"commands" is an ordinary command that causes all of the statements in the
specified file to be executed, and then returns control to the current file.
Bob Fourer
4er@...
> -----Original Message-----
> From:
ampl@... [mailto:
ampl@...] On Behalf Of
> David Veerasingam
> Sent: Thursday, June 12, 2008 2:40 PM
> To: AMPL Modeling Language
> Subject: [AMPL 1826] Seemingly incorrect behavior: AMPL if block
> evaluation
>
>
> Hello all,
>
> It seems to me that AMPL is evaluating `if' blocks even when the
> condition is false.
>
> Example:
> 1) I have an `if' block that looks like this
>
> if (time >= 2) then {
> include process.run;
> }
>
> 2) However, I've found that even when time = 0, the block still
> executes and AMPL quits on this error:
>
> Can't find file "process.run"
> context: include >>> process.run; <<<
>
> Well, the process.run file isn't generated at the conditions time = 0
> or time = 1. The `if' statement is supposed to prevent that block from
> executing.
>
> Therefore my question is: How can I force AMPL to avoid throwing an
> error?
>
> Thanks for your help!
>
> David
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