MATLAB: Funcion “solve” version

solve optimizationproblem

Hi.

I have the 2017 version, I need to use the function solve like solve(prob) for solve a optimization problem but I think that it is possible only in 2019 version. It is correct?

Best Answer

No, Solve optimization problem Introduced in R2017b

Related Solutions

MATLAB: “solve” Function

Did you solve the license problem? Until you have the software installed and licensed, solve() isn't going to work.

The answer you are looking for is along these lines:

syms x y z
xin = input('x =');
yin = input('y =');
zsol = solve('z-y=x', z);
disp(['z = ' char(zsol)]);
znum = double(subs(zsol, {x, y}, {xin, yin}));
disp(['z = ' num2str(znum)]);

MATLAB: Solving trigonometric equation using “solve” function.

Whats the problem? There is no need to set any properties anyway on such a trivial problem.

syms x;
x = solve(230.769*cos(x)+153.846*sin(x) == 1.715, x);
vpa(x)
ans =
                                             2.1526153643152832650062014581097
 - 0.97661015722014818434287396730445 - 1.8367099231598242312011508394098e-40i

The second solution is real, it just has an infinitesimal imaginary part.

And of course, you can add any multiple of 2*pi to those solutions.

But even if you do as you did, then LOOK AT THE SOLUTION THAT YOU DID GET. THINK ABOUT IT!

xsol = solve(230.769*cos(x)+153.846*sin(x) == 1.715, x, 'IgnoreProperties',true, 'ReturnConditions', true)
xsol = 
  struct with fields:
             x: [2×1 sym]
    parameters: [1×1 sym]
    conditions: [2×1 sym]
>> vpa(xsol.x)
ans =
                                             6.283185307179586476925286766559*k + 2.1526153643152832650062014581097
 6.283185307179586476925286766559*k - (0.97661015722014818434287396730445 + 1.8367099231598242312011508394098e-40i)

Which says that for integer k, you can add any integer multiple of 2*pi to the solution. I'm pretty sure I said that initially.

xsol.conditions
ans =
 in(k, 'integer')
 in(k, 'integer')

Best Answer

Related Solutions

MATLAB: “solve” Function

MATLAB: Solving trigonometric equation using “solve” function.

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