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Re: Symbolic Math Package 2.5.0


From: Oliver Heimlich
Subject: Re: Symbolic Math Package 2.5.0
Date: Sun, 23 Apr 2017 09:50:15 +0200
User-agent: K-9 Mail for Android

Am 23. April 2017 00:42:12 MESZ schrieb evansste <address@hidden>:
>I've recently learned that the "solve" function has been fixed in
>Octave's
>latest symbolic math package; package 2.5.0.  This is according to the
>following link:
>
>https://octave.sourceforge.io/symbolic/NEWS.html
>
>It's mentioned in the sixth bullet that "solve" now works with
>inequalities.
>
>I tried using the solve function in order to solve an equation (not an
>inequality), but it didn't work.  Before giving up, I wanted to verify
>if
>it's everyone's current understanding that the symbolic package doesn't
>solve equations.
>
>When I type the following command, I get an error message stating that
>the
>equals sign is an invalid constant.  Here's the command that I type:
>
>solve(2 = x + 1,x)
>
>The error message reads:
>   invalid constant left hand side of assignment
>>>> solve(2 = x +1,x)
>                   ^
>
>Am I doing something wrong, or is this function still broken?
>
>According to the above link, I'm using the latest package.  If I type
>"pkg
>list", it shows that symbolic 2.5.0 is installed.  Has anyone gotten
>the new
>symbolic package to solve an equation?  All of the posts that I've been
>able
>to find are old.  Just wanted to confirm before giving up.  Thanks.
>
>
>
>--
>View this message in context:
>http://octave.1599824.n4.nabble.com/Symbolic-Math-Package-2-5-0-tp4682975.html
>Sent from the Octave - Maintainers mailing list archive at Nabble.com.

Hi,

you have to use the equal operator == instead of the assignment operator = to 
make it work.

See here for some examples on how to use the solve function or use 'help 
@sym/solve' in Octave.

https://octave.sourceforge.io/symbolic/function/@sym/solve.html

Oliver



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