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Re: Problem with variable declaration [message #70522 is a reply to message #70521]

Wed, 21 April 2010 10:34

bala murugan
Messages: 23
Registered: April 2010

Junior Member

On Apr 21, 11:31 am, jeanh
<jghasb...@DELETETHIS.environmentalmodelers.ANDTHIS.com> wrote:
> On 21/04/2010 1:24 PM, bala murugan wrote:
>
>> Hi guys,
>
>> IDL> print,((10^5)/(exp(10)*factorial(5)))
>
>> The actual result of the above line is 0.0378332748
>
>> But when we run it in IDL we get the result as -0.011755556
>
>> What should be done to rectify this?
>
>> Thanks,
>> B
>
> be careful of your data type.
> 10^5 will not work, as the result is an integer... but its intended
> value is too big for an integer!
>
> IDL> help,(10^5)
> <Expression> INT = -31072
>
> So you can compute this with double precision
>
> IDL> help,(10D^5)
> <Expression> DOUBLE = 100000.00
>
> IDL> print,((10^5)/(exp(10)*factorial(5)))
> -0.011755555
> IDL> print,((10D^5)/(exp(10)*factorial(5)))
> 0.037833276
>
> Jean

Thanks a lot Jean. But when I am using an expression like the
following,

a = (u^x)/(exp(u)*factorial(x))

where u=10 & x = 5

What do I do in this case?

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[Message index]

		Re: Problem with variable declaration By: bala murugan on Wed, 21 April 2010 10:55
		Re: Problem with variable declaration By: bala murugan on Wed, 21 April 2010 10:53
		Re: Problem with variable declaration By: penteado on Wed, 21 April 2010 10:47
		Re: Problem with variable declaration By: bala murugan on Wed, 21 April 2010 10:36
		Re: Problem with variable declaration By: bala murugan on Wed, 21 April 2010 10:34
		Re: Problem with variable declaration By: Bruce Bowler on Wed, 21 April 2010 10:33
		Re: Problem with variable declaration By: jeanh on Wed, 21 April 2010 10:31
		Re: Problem with variable declaration By: penteado on Wed, 21 April 2010 10:59

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