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Problem with Solve command

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Dani D
Dani D 2016-3-6
回答： John BG 2016-3-8
Hello my friends, With matlab 2010 , we can't use this m file , but the same program is fine in matlab 2015.

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回答（2 个）

John D'Errico
John D'Errico 2016-3-6
编辑：John D'Errico 2016-3-6
Solve does not come with EVERY copy of MATLAB, but only if you have the symbolic toolbox installed.
Apparently you don't have the symbolic toolbox on that older release, but you do on the new one.
On the command line of your older release, try the ver command. It will tell you which toolboxes are installed.
ver
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John D'Errico
John D'Errico 2016-3-8
编辑：John D'Errico 2016-3-8
Your second answer, also moved into a comment:
"I type 'ver' and i see sybmolic math toolbox version 5."
Please stop thinking of Answers as a threaded thing, where you add a new answer every time you want to make a comment.
John D'Errico
John D'Errico 2016-3-8
So you do have the symbolic toolbox. A careful blowup of the image you posted shows that solve is indeed there. Apparently solve has changed in capability over the years. What you are trying to do is quite difficult to read. Why not post actual text, instead of a fuzzy, unclear, barely readable picture of tiny text?

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John BG
John BG 2016-3-8
Hi Dani
I try this
syms x y z
eq3=7*x-8*y-351
eq1=x+2*y+3*z-366
eq2=4*x+5*y+6*z-804
[x0,y0,z0]=solve(eq1,eq2,eq3)
and it gets solved
x0 =
927/23
y0 =
-198/23
z0 =
2629/23
first, really, stop taking screen shots of code with your mobile or camera, and either
  • simply copy and paste code
  • or hit prtcsn button on your keyboard, and crop the image accordingly
second, perhaps it's time to consider upgrading to R2016 or nearby
If you find this answer of any help solving your question, please click on the thumbs-up vote link,
thanks in advance
John
jgb2012@sky.com

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