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Re: Could you explain why this happen? [message #70708 is a reply to message #70707]

Wed, 28 April 2010 10:01

jeanh
Messages: 79
Registered: November 2009

Member

On 28/04/2010 12:46 PM, Bryan wrote:
> This may be a stupid question, but I really want to know why.
> Please, see below and explain. Thanks.
>
> IDL> print, 132*30
> 3960
> IDL> print, 132*30*10
> -25936
> IDL> print, 132*300
> -25936
> IDL> data1 = 132
> IDL> data2 = 300
> IDL> data3 = data1*data2
> IDL> print, data3
> -25936

Hi,

you are working with integers, the maximum value being 32 767. When you
go over this limit, IDL goes back to the minimum value (-32 768). So 32
767 + 1 = -32 768
Use long integers instead, and you will have the value you are expecting!

Jean

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[Message index]

		Re: Could you explain why this happen? By: Carsten Lechte on Thu, 29 April 2010 03:57
		Re: Could you explain why this happen? By: David Fanning on Wed, 28 April 2010 12:26
		Re: Could you explain why this happen? By: bryan.s.hong on Wed, 28 April 2010 10:54
		Re: Could you explain why this happen? By: David Fanning on Wed, 28 April 2010 10:06
		Re: Could you explain why this happen? By: Michael Galloy on Wed, 28 April 2010 10:04
		Re: Could you explain why this happen? By: jeanh on Wed, 28 April 2010 10:01

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