Converting 2 symbolic expressions into a function handle

Question

kalpana 2013-8-13

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/84636-converting-2-symbolic-expressions-into-a-function-handle

采纳的回答： Andrei Bobrov

在 MATLAB Online 中打开

I have to solve 2 symbolic expressions num1 = 0 & num2 = 0.

For this , i have given the code like the following ::

syms p q ;

num1 = 3* p^3 + 4*p*q + 5* p^2 + 1; num2 = 4* p^5 + 9*p^3*q + 2* p*q^2 + 2;

fh = matlabFunction(num1, num2)

[x] = fsolve( fh, [1,2] )

When i execute this code, i am getting the following error .

    " ??? Input argument "q" is undefined.
       Error in ==>
        sym.matlabFunction>makeFhandle/@(p,q)deal (p.*q.*4.0+p.^2.*5.0+p.^3.*3.0+1.0,p.*q.^2.*2.0+p.^3.*q.*9.0+p.^5.*4.0+2.0)
      Error in ==> fsolve at 248
            fuser = feval(funfcn{3},x,varargin{:});
     Caused by:
         Failure in initial user-supplied objective function evaluation.    FSOLVE cannot continue. "

I tried a lot to rectify this error. But, could not get any thing. Please help me if anyone knows how to solve this problem.

Thanks in advance.

--Kalpana

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Answer 1

Andrei Bobrov 2013-8-13

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/84636-converting-2-symbolic-expressions-into-a-function-handle#answer_94200

在 MATLAB Online 中打开

syms p q;
num1 = 3* p^3 + 4*p*q + 5* p^2 + 1; 
num2 = 4* p^5 + 9*p^3*q + 2* p*q^2 + 2;
f = matlabFunction([num1;num2],'vars',{[p,q]});
out = fsolve(f,[1,2]);