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keyword params in HISTOGRAM [message #7546]

Wed, 20 November 1996 00:00

Mark Fardal
Messages: 51
Registered: October 1995

Member

Hi,

I'm sure this is a stupid question, but I can't figure it out.
Normally when you pass keyword parameters, you can pass something
that's undefined, right? As in this example

pro junk1, a, test=test
help,test,t
;junk2, a, test=test ; either one of
junk2, a, test=t ; these works
return
end

pro junk2, a, test=test

a = 3.
return
end

IDL> junk1, a
TEST UNDEFINED = <Undefined>
T UNDEFINED = <Undefined>
IDL>

However, when I try to pass HISTOGRAM a keyword parameter that's
undefined, I get an error message. The routine here is just a
wrapper function for HISTOGRAM, so I want to pass a number of
keyword parameters through to it.

function histomake, array, binsize=binsize, xpoints=xpoints, $
input=input, min=min, max=max, omin=omin, omax=omax, reverse=reverse
[...stuff deleted...]

n = histogram(array, binsize=binsize, min=min, max=max, $
omin=omin, omax=omax, reverse=reverse)

[...stuff deleted...]
return
end

IDL> h = histomake(array, bins=10, xpoints=xpoints)
% HISTOGRAM: Variable is undefined: MAX.
% Execution halted at: HISTOMAKE 52
/users1/casa/fardal/comp/idl/histomake.pro
% $MAIN$

Why is the behavior different here?

Thanks,
Mark

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[Message index]

		keyword params in HISTOGRAM By: Mark Fardal on Wed, 20 November 1996 00:00
		Re: keyword params in HISTOGRAM By: thompson on Tue, 03 December 1996 00:00
		Re: keyword params in HISTOGRAM By: Robert Moss on Tue, 03 December 1996 00:00

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