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Re: exp() infinity [message #61834]

Fri, 08 August 2008 09:52

mankoff
Messages: 131
Registered: March 2004

Senior Member

On Aug 8, 12:07 pm, maffie <matthias.demuz...@geo.kuleuven.be> wrote:
> Hi,
>
> Thank you!
> I the meanwhile I found this link, with the exact same question (and
> answer):http://www.dfanning.com/math_tips/underflow.html
>
> Is there also a possibility to add double precision (with this "d") to
> an array? And it seems that I have many more problems with my
> calculations, because I get some more messages about underflow and
> overflow.
>
> Thereby 2 more questions:
> - Would there be a solution to solve all these in ones? Like adding a
> statement somewhere to work in double precision in any of the
> calculations?
> - Is there an easy way to see where exactly (in a sequence of
> calculations) where it all goes wrong?
>
> Thank you!
> Matthias

To convert an array to double you can do
IDL> dbl = arr*1.0d
or slighly faster
IDL> dbl = DOUBLE(arr)

To find out where the problems are happening, you can use ON_ERROR or !
EXCEPT and CHECK_MATH

-k.

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[Message index]

		Re: exp() infinity By: mankoff on Fri, 08 August 2008 09:52
		Re: exp() infinity By: Jean H. on Fri, 08 August 2008 09:06
		Re: exp() infinity By: matthias.demuzere on Fri, 08 August 2008 09:07
		Re: exp() infinity By: Foldy Lajos on Fri, 08 August 2008 08:57

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