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Re: scopes [message #86165 is a reply to message #85951]

Tue, 15 October 2013 08:23

Matthew Argall
Messages: 286
Registered: October 2011

Senior Member

Variables are passed by reference in IDL. If two output positional parameters reference the same variable name, you are going to have a bad time.

Try this

-----------------------------------
pro test_input_params, a, b
a = 5
b = 4
help, a, b
end

test_input_params, null, null
----------------------------------

It shows that a = a = 4 and that b = a = 4 inside the test program. If I were to later do something with a and b independently, the results would not be independent. I assume that CalDat uses the "month" and "day" parameters when calculating "year", which is why your output is funky.

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[Message index]

		scopes By: spluque on Fri, 20 September 2013 14:28
		Re: scopes By: David Fanning on Fri, 20 September 2013 14:44
		Re: scopes By: spluque on Fri, 20 September 2013 15:00
		Re: scopes By: SonicKenking on Sun, 13 October 2013 20:20
		Re: scopes By: spluque on Fri, 20 September 2013 14:52
		Re: scopes By: Matthew Argall on Tue, 15 October 2013 08:23
		Re: scopes By: Matthew Argall on Tue, 15 October 2013 08:41

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