Re: Re: NSolve fails where Solve succeeds!
- To: mathgroup at smc.vnet.net
- Subject: [mg43530] Re: [mg43478] Re: NSolve fails where Solve succeeds!
- From: Murray Eisenberg <murray at math.umass.edu>
- Date: Fri, 19 Sep 2003 03:41:53 -0400 (EDT)
- Organization: Mathematics & Statistics, Univ. of Mass./Amherst
- References: <bk9jer$t8t$1@smc.vnet.net> <200309180938.FAA10468@smc.vnet.net>
- Reply-to: murray at math.umass.edu
- Sender: owner-wri-mathgroup at wolfram.com
Are you objecting to the absence of a (vector) variable on the left-hand
side of the equation, or just to an equation with a matrix (list of
equal-length lists) on the left-hand side and a scalar on the right-hand
side?
If the latter: Why should Mathematica NOT like {{a,b}, {c,d}} == 0 ?
After all, it has no trouble returning a reasonable result for:
((a, b}, {c, d}} + 0
I'm not talking about the way the language IS, but rather the way it
OUGHT to be designed!
Jens-Peer Kuska wrote:
> Hi,
>
> you say that the matrix {{a,b}
> {c,d}}
>
> should be equal to a scalar 0 and you wonder
> why Mathematica dont' like it ...
>
> I wonder why Solve[] gives a solution at all
> and *this* seems to be the bug. You mean
>
> NSolve[Flatten[Thread /@ Thread[{{a, b}, {c, d}} == 0]]]
>
> you you should tell Mathematica *what* you mean.
>
> Regards
> Jens
>
>
> Pavel Pokorny wrote:
>
>> Dear Mathematica friends
>>
>> Solve[{{a,b},{c,d}}==0]
>>
>>gives the correct solution in Mathematica 5.0 while
>>
>> NSolve[{{a,b},{c,d}}==0]
>>
>>fails.
>>
>>Is it a bug or an intention?
>>
>>It would be nice to have Solve and NSolve giving
>>as close results as possible.
>>
>>--
>>Pavel Pokorny
>>Math Dept, Prague Institute of Chemical Technology
>>http://www.vscht.cz/mat/Pavel.Pokorny
>
>
>
--
Murray Eisenberg murray at math.umass.edu
Mathematics & Statistics Dept.
Lederle Graduate Research Tower phone 413 549-1020 (H)
University of Massachusetts 413 545-2859 (W)
710 North Pleasant Street fax 413 545-1801
Amherst, MA 01003-9305
- References:
- Re: NSolve fails where Solve succeeds!
- From: Jens-Peer Kuska <kuska@informatik.uni-leipzig.de>
- Re: NSolve fails where Solve succeeds!