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Re: Can an object's structure be redifined without restarting IDL [message #16134]

Fri, 02 July 1999 00:00

Liam Gumley
Messages: 473
Registered: November 1994

Senior Member

Frank Morgan wrote:
> If you're working interactively at top-level you can delete the structure
> and recreate it from scratch with new fields - like:
>
> x = {a:0, b:2.0}
> delvar, x
> x = {a:0, b:2.0, c:5.2}
>
> This avoids the data structure conflict. You can't use delvar in procedures
> though.

Because X is an anonymous structure,

x = {a:0, b:2.0}
x = {a:0, b:2.0, c:5.2}

will work just as well, and does not require DELVAR. You can redefine an
anonymous structure on the command line, or in a procedure, function, or
script.

Named structures however cannot be redefined; their definition is fixed
until the end of the IDL session. For example, the second statement
below is not allowed:

y = {TEST, a:0, b:2.0}
y = {TEST, a:0, b:2.0, c:5.2}

Cheers,
Liam.

--
Liam E. Gumley
Space Science and Engineering Center, UW-Madison
http://cimss.ssec.wisc.edu/~gumley

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[Message index]

		Re: Can an object's structure be redifined without restarting IDL By: Liam Gumley on Fri, 02 July 1999 00:00
		Re: Can an object's structure be redifined without restarting IDL By: Frank Morgan on Fri, 02 July 1999 00:00
		Re: Can an object's structure be redifined without restarting IDL By: davidf on Fri, 02 July 1999 00:00

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