comp.lang.idl-pvwave archive: archive

Home » Public Forums » archive » Re: Math Question

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: Math Question [message #51099 is a reply to message #51098]

Mon, 30 October 2006 12:32

Jean H.
Messages: 472
Registered: July 2006

Senior Member

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

Report message to a moderator

[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

Previous Topic:	Re: Determining a safe variable name from a string
Next Topic:	overlaying arrow plots

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Thu Oct 09 21:56:37 PDT 2025

Total time taken to generate the page: 1.43853 seconds