Re: keyword issue (top 10 IDL request?)

[Andy Loughe <loughe(at)fsl.noaa.gov>]

Kenneth Mankoff wrote:
> 
> Hi all,
> 
> here is another thing with current versions of IDL that causes problems
> and confuses me:
> 
> a keyword set to 0 should not be undefined, it should be defined as zero.
> For example:
> 
> IDL> create_globe, lat=90, long=0, ...
> I want create_globe to put longitude 0 at the center of the image (i.e.
> pass "0" to map_set). But if i don't use long= at all, then it should be
> undefined, and the following code should run (inside create_globe)
> IF ( NOT KEYWORD_SET( long ) ) THEN long = 277.5  ;;; geomagnetic pole '98
> 
> However, the above line of code runs even if i set long to "0". I have
> been using long=0.1 as a work-around, but this is an ugly hack that others
> might not think to use.
> 
> any ideas to fix this are welcome, and if no one has any good ideas, then
> please add this to your top ten list, David Fanning.
> 
> Thanks,
>   ken.


if ( N_elements(long) eq 0 ) then long = 277.5


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