Why cannot I fully run this code in exe?

Question

DIJESH 2014-6-2

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/132046-why-cannot-i-fully-run-this-code-in-exe

回答： Niklas Nylén 2014-6-2

E = 1.5*(10.^9);
A = 0.00017;
prompt = {'Enter the value of  F1: '};
title = 'F1';
answer = inputdlg(prompt,title);
F1 = str2num(answer{1});
prompta = {'Enter the angle: '};
titlea = 'Angle';
answera = inputdlg(prompta,titlea);
theta = str2num(answera{1});
x = sym('x');
f1 = (4*E*A*sin(x)*tan(x)*cos(theta)-F1);
angdsp1 = vpasolve(f1,x,[0 45]);
a = double(angdsp1);
msgbox(['The value of a is: ',num2str(a)],'Results')

This code is working absilutely fine in matlab. I wrote the code mcc -m filename.m and converted into exe. But i cannot run it. it is showing undefined function 'sym' for input arguments of type 'char'. What to do? Please help.