Strange "solve" error and undefined "vpasolve"

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Philip Croné
Philip Croné 2018-11-3
评论： Walter Roberson 2025-4-22
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
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 ?

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采纳的回答

Star Strider
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.
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Francisco Lopes
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.

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更多回答（1 个）

MohammadMahdi MovahedFar
编辑：MohammadMahdi MovahedFar 2025-4-22

You should write:

S = vpasolve(...)

Without assignment it won't work.

  2 个评论
Walter Roberson
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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