Thread Subject: solve in R2008b; bug or feature?

In R2008b, solve seems to return strange results:

>> solve ('x^(5/2) + x^(1/2) = 42')

ans =

0

Joerg J. Buchholz wrote:
> In R2008b, solve seems to return strange results:

>>> solve ('x^(5/2) + x^(1/2) = 42')
>
> ans =
>
> 0

Gotta be a bug :(

In article <7ilNk.27346$bK.21604@newsfe04.iad>, roberson@hushmail.com
says...
> Joerg J. Buchholz wrote:
> > In R2008b, solve seems to return strange results:
>
> >>> solve ('x^(5/2) + x^(1/2) = 42')
> >
> > ans =
> >
> > 0
>
> Gotta be a bug :(
>

Yes, and I've added to our system so it can be fixed.


--
Loren
http://blogs.mathworks.com/loren

On Oct 26, 3:21=A0pm, "Joerg J. Buchholz" <jjbuchh...@gmail.com> wrote:
> In R2008b, solve seems to return strange results:
>
> >> solve ('x^(5/2) + x^(1/2) =3D 42')
>
> ans =3D
>
> 0

We also acquired MATLAB 2008b + Symbolic Toolbox.

Your example is just a specific case of the hundreds MATLAB 2008b
bugs discovered by our VM machine without any human intervention.
But this is just the beginning of the story.

To make a long story short, on Oct 15, 2008 we sent a message to
the MathWorks owners but had a communication problem; Mr. Lord
kindly promised "to determine the correct course of action for
the issue" we raised.

So, hopefully, thanks to Mr. Lord's effort, soon we will be able
to sent an email message to Mr. Little and Dr. Moler in the way
it reaches them.

Best wishes,

Vladimir Bondarenko

Co-founder, CEO, Mathematical Director

http://www.cybertester.com/ Cyber Tester Ltd.

-----------------------------------------------------------------

"We must understand that technologies
like these are the way of the future."

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Vladimir Bondarenko <vb@cybertester.com> wrote in message <d3846338-a3ef-4b62-8646-cbe21de1f8a9@d10g2000pra.googlegroups.com>...
> On Oct 26, 3:21=A0pm, "Joerg J. Buchholz" <jjbuchh...@gmail.com> wrote:
> > In R2008b, solve seems to return strange results:
> >
> > >> solve ('x^(5/2) + x^(1/2) =3D 42')
> >
> > ans =3D
> >
> > 0
>
> We also acquired MATLAB 2008b + Symbolic Toolbox.
>
> Your example is just a specific case of the hundreds MATLAB 2008b
> bugs discovered by our VM machine without any human intervention.
> But this is just the beginning of the story.
>
> To make a long story short, on Oct 15, 2008 we sent a message to
> the MathWorks owners but had a communication problem; Mr. Lord
> kindly promised "to determine the correct course of action for
> the issue" we raised.
>
> So, hopefully, thanks to Mr. Lord's effort, soon we will be able
> to sent an email message to Mr. Little and Dr. Moler in the way
> it reaches them.
>
> Best wishes,
>
> Vladimir Bondarenko
>
> Co-founder, CEO, Mathematical Director
>
> http://www.cybertester.com/ Cyber Tester Ltd.
>
> -----------------------------------------------------------------
>
> "We must understand that technologies
> like these are the way of the future."
>
> -----------------------------------------------------------------

"Mr. Lord kindly promised "to determine the correct
course of action for the issue" we raised."

Mr. Lord contacted me today, after 10 days I sent him letter,
and reported that he "contacted the appropriate staff here
at The MathWorks"