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Re: Defining structuretype during runtime?? QUESTION!! (no reply) [message #10045 is a reply to message #4955]

Mon, 06 October 1997 00:00

R. Bauer
Messages: 137
Registered: November 1996

Senior Member

Norbert Hahn wrote:
>
> Juergen Paff <paff@paff.slip.ethz.ch> wrote:
> [...snip...]
>> 2) As you learn (name and) type only at run time, you might want to use the
>> command
>
>> return_status=execute(string_argument)
>
>> string_argument has to be a string that conains a command that is valid at
>> run time. Consider the following situation:
> [...snip...]
> Ahem, but look at this warning included in the help for execute:
> *** begin of quote ***
> "Warning
>
> "Do not use EXECUTE to create new variables inside procedures or functions. All
> variables used by the string that is executed should be
> referenced or defined when the program unit is originally compiled. New
> variables cannot be created after a procedure or function is
> compiled. Attempts to create new variables result in the error "Program data
> area full".
> *** end of quote ***

That's true, but you can undefine variables before whith
a=n_elements(unknown)

help,unknown
UNKOWN UNDEFINED = <Undefined>

Undefined variables could be used by execute, since idl3.6.1 !

--
R.Bauer

Institut fuer Stratosphaerische Chemie (ICG-1)
Forschungszentrum Juelich
email: R.Bauer@fz-juelich.de

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[Message index]

		Defining structuretype during runtime?? QUESTION!! (no reply) By: Christian Oehreneder on Thu, 07 September 1995 00:00
		Re: Defining structuretype during runtime?? QUESTION!! (no reply) By: Thomas A McGlynn on Mon, 11 September 1995 00:00
		Re: Defining structuretype during runtime?? QUESTION!! By: Juergen Paff on Fri, 08 September 1995 00:00
		Re: Defining structuretype during runtime?? QUESTION!! (no reply) By: sjt on Fri, 08 September 1995 00:00
		Re: Defining structuretype during runtime?? QUESTION!! (no reply) By: Jackel on Fri, 08 September 1995 00:00
		Re: Defining structuretype during runtime?? QUESTION!! (no reply) By: Juergen Paff on Thu, 07 September 1995 00:00
		Re: Defining structuretype during runtime?? QUESTION!! (no reply) By: R. Bauer on Mon, 06 October 1997 00:00
		Re: Defining structuretype during runtime?? QUESTION!! (no reply) By: mgs on Mon, 06 October 1997 00:00
		Re: Defining structuretype during runtime?? QUESTION!! (no reply) By: hahn on Sun, 05 October 1997 00:00

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