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Re: exp() infinity [message #61836 is a reply to message #61834]

Fri, 08 August 2008 09:06

Jean H.
Messages: 472
Registered: July 2006

Senior Member

maffie wrote:
> Hi all,
>
> I have a small question concerning the exponential function exp():
> For values above around 89, IDL returns exp(89) = Infinity.
>
> Is there any way to get the mathematical solution??
> e.g. exp(89) = 4.4896128e38
>
> Thank you!
> Matthias

the help file says:
"The expression to be evaluated. If Expression is double-precision
floating or complex, the result is of the same type. All other types are
converted to single-precision floating-point and yield floating-point
results."

so try
IDL> print,exp(89.0D)
4.4896128e+038

Jean

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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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