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Re: Math Question [message #51100 is a reply to message #51099]

Mon, 30 October 2006 12:35

Jean H.
Messages: 472
Registered: July 2006

Senior Member

Jean H. wrote:
> Jo Klein wrote:
>
>>> Just out of curiosity, has anyone tried this on Matlab? I'd expect the
>>> same (or similar) results, but it'd be interesting if they weren't.
>>
>>
>> Matlab returns the real part of the argument if it's a real number you
>> put in:
>>>> -0.1^2.0
>>
>> ans =
>> -0.0100
>>
>>>> -0.1^2.01
>> ans =
>> -0.0098
>>
>>>> complex(-0.1,0)^2.01
>> ans =
>> 0.0098 + 0.0003i
>> Hmm - I don't know if this is more desirable than IDL's behaviour, I
>> think it's fair enough to warn people who try to do something like
>> that with their data. In Matlab, try and invert the second operation
>> ... this can't be good. Suppose there are arguments for both approaches.
>> Jo
>
>
> It depends indeed...
>
>>> -0.1^2.1
> ans =
> -0.0079
>
>>> (-0.1)^2.1
> ans =
> 0.0076 + 0.0025i
>
> You don't have to specify the complex() statement!
>
> Jean

for clarity:
>> a=-0.1
a =
-0.1000

>> a^2
ans =
0.0100

>> a^2.1
ans =
0.0076 + 0.0025i

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[Message index]

		Re: Math Question By: rkombiyil on Wed, 01 November 2006 04:51
		Re: Math Question By: Jo Klein on Tue, 31 October 2006 04:33
		Re: Math Question By: news.qwest.net on Mon, 30 October 2006 13:07
		Re: Math Question By: Jean H. on Mon, 30 October 2006 12:32
		Re: Math Question By: Jean H. on Mon, 30 October 2006 12:35
		Re: Math Question By: Jo Klein on Mon, 30 October 2006 12:17
		Re: Math Question By: Braedley on Mon, 30 October 2006 10:22
		Re: Math Question By: James Kuyper on Mon, 30 October 2006 10:15
		Re: Math Question By: David Fanning on Mon, 30 October 2006 09:19
		Re: Math Question By: James Kuyper on Mon, 30 October 2006 09:04
		Re: Math Question By: news.qwest.net on Mon, 30 October 2006 08:54
		Re: Math Question By: Foldy Lajos on Mon, 30 October 2006 07:29
		Re: Math Question By: edward.s.meinel@aero. on Mon, 30 October 2006 07:19
		Re: Math Question By: Rob Dimeo on Sun, 29 October 2006 16:15
		Re: Math Question By: Robbie on Sun, 29 October 2006 15:40
		Re: Math Question By: Robbie on Sun, 29 October 2006 15:01
		Re: Math Question By: Foldy Lajos on Sun, 29 October 2006 09:59

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