Problem with Solve command

Hello my friends, With matlab 2010 , we can't use this m file , but the same program is fine in matlab 2015.

Answer 1

[John D'Errico]

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

[John D'Errico]

Please, if you have a comment, use the comment ability rather than adding an answer. I've moved your followup comment into a comment for you:

"Thanks, How can install symbolic math toolbox?"

[John D'Errico]

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]

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?

Answer 2

[John BG]

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

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