ans = 
Strange "solve" error and undefined "vpasolve"
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Hi,
When trying to use the "solve" function for one of the doc examples it only returns the sym variable. It doesn't even solve the equation x+1==0, when using the syntax:
syms x
solvex=solve(x+1==0,x)
it only returns solvex=x. Even worse, it does not even recognize vpasolve as a function and gives the error: "Undefined function or variable 'vpasolve'". Any help would be greatly appreciated.
/Philip
2 个评论
Walter Roberson
2018-11-3
Is it possible that at some point you installed the Maplesoft MATLAB Connector, which is an interface that permits MATLAB to call into Maple ?
Philip Croné
2018-11-4
采纳的回答
Star Strider
2018-11-3
This may be a path problem.
Try typing these either in your Command Window or a script:
restoredefaultpath
rehash toolboxcache
If that does not solve your problem, request Tech Support through the Contact Us link at the top right corner of this page.
4 个评论
Philip Croné
2018-11-3
Star Strider
2018-11-3
As always, my pleasure!
Francisco Lopes
2023-1-26
编辑：Francisco Lopes
2023-1-26
I solved this kind of problem using:
syms z
before the solver command.
Ex.:
syms z
Sol = solve(fA == 0, fB == 0);
Justifying: Matlab needs treat z symbolic in order to handle the different solutions.
Star Strider
2023-1-26
@Francisco Lopes — That wasn’t actually the original problem.
更多回答（1 个）
MohammadMahdi MovahedFar
2025-4-22
编辑：MohammadMahdi MovahedFar
2025-4-22
0 个投票
You should write:
S = vpasolve(...)
Without assignment it won't work.
2 个评论
Walter Roberson
2025-4-22
The original problem was that the user had installed the Maplesoft Maple symbolic interface, which does not define a function named vpasolve . Requiring output for an undefined function does not fix the problem that the function is undefined.
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