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Re: Most Common IDL Programming Errors [message #59811 is a reply to message #59761]

Wed, 09 April 2008 19:18

Tom McGlynn
Messages: 13
Registered: January 2008

Junior Member

One problem that I used to make all the time was to assume that WHERE
returned a match, e.g.,

w = where(x gt 0)
x[w] = alog10(x[w])

neglecting the case where the x are all negative. My programs would
always work when I tested them, and then I'd find they failed when I
tried them in the real world. The need to check finally got beaten
into me.

Another is fogetting the inherently parallel nature of array
operations, e.g., something like expecting

x=[0,1,1,2,2,2]
y=indgen(3)

y[x] = y[x]+1

to give something other than 1,1,1.

Regards,
Tom McGlynn

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[Message index]

		Most Common IDL Programming Errors By: David Fanning on Tue, 08 April 2008 17:13
		Re: Most Common IDL Programming Errors By: Tom McGlynn on Fri, 11 April 2008 05:55
		Re: Most Common IDL Programming Errors By: R.G. Stockwell on Fri, 11 April 2008 09:02
		Re: Most Common IDL Programming Errors By: David Fanning on Fri, 11 April 2008 05:58
		Re: Most Common IDL Programming Errors By: R.G. Stockwell on Thu, 10 April 2008 11:16
		Re: Most Common IDL Programming Errors By: Vince Hradil on Thu, 10 April 2008 07:31
		Re: Most Common IDL Programming Errors By: Vince Hradil on Thu, 10 April 2008 07:29
		Re: Most Common IDL Programming Errors By: mmiller3 on Thu, 10 April 2008 06:22
		Re: Most Common IDL Programming Errors By: Maarten[1] on Thu, 10 April 2008 04:35
		Re: Most Common IDL Programming Errors By: Erik[1] on Thu, 10 April 2008 02:29
		Re: Most Common IDL Programming Errors By: izimine on Thu, 10 April 2008 01:51
		Re: Most Common IDL Programming Errors By: Gaurav on Thu, 10 April 2008 00:01
		Re: Most Common IDL Programming Errors By: David Fanning on Wed, 09 April 2008 22:29
		Re: Most Common IDL Programming Errors By: Tom McGlynn on Wed, 09 April 2008 19:18
		Re: Most Common IDL Programming Errors By: Doug on Wed, 09 April 2008 14:33
		Re: Most Common IDL Programming Errors By: David Klassen on Wed, 09 April 2008 11:10
		Re: Most Common IDL Programming Errors By: rlayberry on Thu, 17 April 2008 08:52
		Re: Most Common IDL Programming Errors By: pgrigis on Wed, 16 April 2008 14:39
		Re: Most Common IDL Programming Errors By: R.Bauer on Sun, 13 April 2008 10:28
		Re: Most Common IDL Programming Errors By: David Fanning on Sat, 12 April 2008 11:59
		Re: Most Common IDL Programming Errors By: Vince Hradil on Fri, 11 April 2008 14:23
		Re: Most Common IDL Programming Errors By: Kenneth P. Bowman on Fri, 11 April 2008 11:37
		Re: Most Common IDL Programming Errors By: R.G. Stockwell on Fri, 11 April 2008 13:52
		Re: Most Common IDL Programming Errors By: Vince Hradil on Fri, 11 April 2008 10:54
		Re: Most Common IDL Programming Errors By: R.G. Stockwell on Fri, 11 April 2008 10:41
		Re: Most Common IDL Programming Errors By: Matt[2] on Fri, 11 April 2008 09:30
		Re: Most Common IDL Programming Errors By: David Fanning on Tue, 10 July 2012 05:50
		Re: Most Common IDL Programming Errors By: gerapagi on Tue, 10 July 2012 01:33

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