Having trouble solving system of equations

Hello,

I am trying to have MATLAB solve the following equaitions for C1 and C2 - I thought i could simply use 'solve()' for this but i'm getting a structure response and i need actua results (i would hope real number response) how would it better done? Thanks!

Thanks:

code i'm using:

clear all
close all
clc

syms c1 c2
solve(c1==18*c1-1200+((4.8195*10^-8)*(((0.3*c1+c2)^4)-18^4)),c1==(20*c2-500)/-0.95,c1,c2)

Answer 1

[Star Strider]

Use the correct syntax for solve, and use the vpa function to get numeric results:

syms c1 c2
[C1,C2] = solve(c1==18*c1-1200+((4.8195*10^-8)*(((0.3*c1+c2)^4)-18^4)),c1==(20*c2-500)/-0.95, [c1,c2]);
C1v = vpa(C1, 7)
C2v = vpa(C2, 7)

producing:

C1v =
               70.579
 2057.393 - 3835.412i
 2057.393 + 3835.412i
            -4581.405
 
C2v =
                21.6475
 - 72.72618 + 182.1821i
 - 72.72617 - 182.1821i
               242.6167

The solved constants retain their full internal precision.

Answer 2

[Stephan]

Hi,

shorter:

syms c1 c2
[sol_c1, sol_c2] = vpasolve(c1==18*c1-1200+((4.8195*10^-8)*(((0.3*c1+c2)^4)-18^4)),c1==(20*c2-500)/-0.95,c1,c2)

Best regards

Stephan