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Bug in N_PARAMS? [message #64011]

Mon, 24 November 2008 11:31

Kenneth P. Bowman
Messages: 585
Registered: May 2000

Senior Member

I have been having some very odd problems with the N_PARAMS function lately.

Here is a simple example with a main program and a function.

PRO N_PARAMS_MAIN, a, b
COMPILE_OPT IDL2
PRINT, 'N_PARAMS_MAIN - Number of parameters : ', N_PARAMS()
HELP, a, b
value = N_PARAMS_BUG(a, b)
END

FUNCTION N_PARAMS_BUG, a, b
COMPILE_OPT IDL2
PRINT, 'N_PARAMS_BUG - Number of parameters : ', N_PARAMS()
HELP, a, b
RETURN, 0
END

Here is the output from a new IDL session:

stretch> idl
IDL Version 6.4.1, Mac OS X (darwin i386 m32). (c) 2007, ITT Visual Information Solutions

IDL> N_PARAMS_MAIN, 13
% Compiled module: N_PARAMS_MAIN.
N_PARAMS_MAIN - Number of parameters : 1
A LONG = 13
B UNDEFINED = <Undefined>
% Compiled module: N_PARAMS_BUG.
N_PARAMS_BUG - Number of parameters : 2 <-- returns 2, but b is undefined
A LONG = 13
B UNDEFINED = <Undefined>

In the main program N_PARAMS_MAIN, N_PARAMS correctly returns the number of defined arguments (one).

In the function N_PARAMS_BUG, the argument count is incorrectly given as two.

If I call the function N_PARAMS_BUG from the command line, it works correctly.

IDL> PRINT, N_PARAMS_BUG(10)
N_PARAMS_BUG - Number of parameters : 1
A LONG = 10
B UNDEFINED = <Undefined>
0

Am I missing something obvious here?

Ken

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[Message index]

		Bug in N_PARAMS? By: Kenneth P. Bowman on Mon, 24 November 2008 11:31
		Re: Bug in N_PARAMS? By: David Fanning on Tue, 02 December 2008 07:10
		Re: Bug in N_PARAMS? By: Mark[1] on Mon, 01 December 2008 14:55
		Re: Bug in N_PARAMS? By: Jeremy Bailin on Mon, 01 December 2008 06:11
		Re: Bug in N_PARAMS? By: Mark[1] on Sun, 30 November 2008 14:06
		Re: Bug in N_PARAMS? By: R.Bauer on Fri, 28 November 2008 02:02
		Re: Bug in N_PARAMS? By: pgrigis on Wed, 03 December 2008 11:15
		Re: Bug in N_PARAMS? By: David Fanning on Wed, 03 December 2008 10:49
		Re: Bug in N_PARAMS? By: R.Bauer on Wed, 03 December 2008 09:59

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