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Pass-By-Reference question. [message #38510]

Wed, 10 March 2004 01:19

timrobishaw
Messages: 16
Registered: June 2003

Junior Member

Hi there,

I've been using _REF_EXTRA for a long time now and have come to
appreciate that values of keywords sent to a module with the
_REF_EXTRA mechanism will override any keywords that are set inside
the module. Here is a great example:

pro whaddup, _REF_EXTRA=_extra
plot, [0], [0], /NODATA, XRANGE=[-5,5], YRANGE=[-5,5], PSYM=4,
_EXTRA=_extra
end

IDL> whaddup

I see what the module asked for: axes from -5 to 5 with no datum
plotted.

Now I can override the XRANGE and YRANGE keyword values by passing
them by reference...

IDL> whaddup, XRANGE=[-1,1], YRANGE=[-1,1]

I see what I asked for: axes from -1 to 1.

However, if I send NODATA set to ZERO, i.e., I'd really like to see my
datum this time...

IDL> whaddup, XRANGE=[-1,1], YRANGE=[-1,1], NODATA=0

I don't get what I asked for. The value for NODATA sent by reference
does not override the value set inside the module. This is also true
for the /NOERASE keyword.

IDL newsgroup: whaddup?

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[Message index]

		Pass-By-Reference question. By: timrobishaw on Wed, 10 March 2004 01:19
		Re: Pass-By-Reference question. By: JD Smith on Fri, 12 March 2004 13:57
		Re: Pass-By-Reference question. By: timrobishaw on Thu, 18 March 2004 17:50
		Re: Pass-By-Reference question. By: Mark Hadfield on Wed, 17 March 2004 14:25

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