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Re: Can somebody explain this? [message #41028 is a reply to message #41027]

Thu, 16 September 2004 07:42

K. Bowman
Messages: 330
Registered: May 2000

Senior Member

In article <41499b92$1@x-privat.org>,
"sandrokan" <mura@remove.ifsi.rm.cnr.it> wrote:

> Thank you. At least, it is reported somewhere; anyway, I find it quite
> dangerous to introduce
> such a feature for array subscripting and not for scalars.

Well, like a number of IDL features, it is handy if you know about it,
dangerous if you don't. ;-)

> It is similar to
> permit "for" loops for
> not-integer values without accuracy....
> for i=0., 10, .1 do print, i
>
> ............
>
> 7.70000
>
> 7.79999

My advice to students is simple: understand roundoff error and don't
index loops with FLOATs unless you know *exactly* what you are doing.

Ken

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[Message index]

		Re: Can somebody explain this? By: sandrokan on Thu, 16 September 2004 23:06
		Re: Can somebody explain this? By: sandrokan on Thu, 16 September 2004 22:57
		Re: Can somebody explain this? By: Mark Hadfield on Thu, 16 September 2004 17:04
		Re: Can somebody explain this? By: K. Bowman on Thu, 16 September 2004 12:36
		Re: Can somebody explain this? By: James Kuyper on Thu, 16 September 2004 11:32
		Re: Can somebody explain this? By: sandrokan on Thu, 16 September 2004 11:09
		Re: Can somebody explain this? By: Craig Markwardt on Thu, 16 September 2004 07:46
		Re: Can somebody explain this? By: K. Bowman on Thu, 16 September 2004 07:42
		Re: Can somebody explain this? By: Matt Feinstein on Thu, 16 September 2004 06:57
		Re: Can somebody explain this? By: sandrokan on Thu, 16 September 2004 06:43
		Re: Can somebody explain this? By: K. Bowman on Thu, 16 September 2004 06:16

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