|
From: | Benjamin Lindner |
Subject: | Re: 3.0.2 release (mingw32 check) |
Date: | Tue, 26 Aug 2008 17:26:36 +0200 |
User-agent: | Thunderbird 2.0.0.14 (Windows/20080421) |
John W. Eaton wrote:
On 26-Aug-2008, Benjamin Lindner wrote: | John W. Eaton wrote: | > On 26-Aug-2008, Benjamin Lindner wrote:| > | > | I can follow your argumentation, but why does (-i) have a real part of | > | (-0) and simultaneously (-1) has a imaginary part of (0) (without the | > | sign) ? | > | > -1 is stored as a real number only. There is no imaginary part. | > | > | The above test expects mat2str([-1/3]) to result in "-0.3333+0i".| > | Isn't this inconsistent?| > | > Yes. | | Considered a bug?I would guess most people would say no.
I'd agree. Good :)
| > | 1/3 is represented as (1/3,0) and negating it should then yield | > | (-1/3,-0). This is what puzzled me about this test. | > | > We do have pure real numbers. 1/3 is not stored as (1/3, 0). It has| > no imaginary part.| | This I know, but obviously -1/3 is expanded to a complex number,I don't follow. When are you thinking it is "epxanded to a complex number"?
Sorry, I didn't make it clear enough. I assumed it, because the output is printed as a complex number: octave:1> mat2str([-1/3]) ans = -0.33333333333333331 octave:2> mat2str([-1/3,i]) ans = [-0.33333333333333331+0i;0+1i]In the second case, -1/3 is printed as a complex number, thus I assumed it must be expanded. I guess [-1/3,i] is internally stored as a complex 2x1 matrix, so every element is "expanded" to a complex number. "expand" might be the wrong terminus here, "convert" would be more appropriate, sorry.
benjamin
[Prev in Thread] | Current Thread | [Next in Thread] |