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Re: LEGENDRE problem [message #62539]

Tue, 16 September 2008 05:42

Jeremy Bailin
Messages: 618
Registered: April 2008

Senior Member

>> What arguments are you giving it? Do you expect it to underflow? If
>> so, that's fine (although you may want to suppress it for speed
>> purposes - seehttp://www.dfanning.com/math_tips/underflow.htmland
>> http://www.dfanning.com/code_tips/underflow.html).
>
> Uh, I think the word was "OVERflow". :-(

Clearly I need to move my reading-IDL-newsgroup part of the day to
after my first coffee. ;-)

-Jeremy.

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Re: LEGENDRE problem [message #62556 is a reply to message #62539]

Mon, 15 September 2008 07:06

pgrigis
Messages: 436
Registered: September 2007

Senior Member

xiao wrote:
> Hi~ everyone~ I want to use this function in IDL. But it always
> reminds me
>
> Program caused arithmetic error: Floating overflow

Could you give us an example of input value that cause
the overflow? Seems strange to me...

Paolo

>
> I have already use the DOUBLE key words, What should i do now?
>
> Thank you

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Re: LEGENDRE problem [message #62557 is a reply to message #62556]

Mon, 15 September 2008 06:42

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Jeremy Bailin writes:

> What arguments are you giving it? Do you expect it to underflow? If
> so, that's fine (although you may want to suppress it for speed
> purposes - see http://www.dfanning.com/math_tips/underflow.html and
> http://www.dfanning.com/code_tips/underflow.html).

Uh, I think the word was "OVERflow". :-(

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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Re: LEGENDRE problem [message #62560 is a reply to message #62557]

Mon, 15 September 2008 05:49

Jeremy Bailin
Messages: 618
Registered: April 2008

Senior Member

On Sep 14, 9:09 pm, xiao <littledd...@gmail.com> wrote:
> Hi~ everyone~ I want to use this function in IDL. But it always
> reminds me
>
> Program caused arithmetic error: Floating overflow
>
> I have already use the DOUBLE key words, What should i do now?
>
> Thank you

What arguments are you giving it? Do you expect it to underflow? If
so, that's fine (although you may want to suppress it for speed
purposes - see http://www.dfanning.com/math_tips/underflow.html and
http://www.dfanning.com/code_tips/underflow.html).

-Jeremy.

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