Error using MATLAB fsolve function and not sure why.

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Hayden Herrick
Hayden Herrick 2022-4-23
回答： Walter Roberson 2022-4-23
Im having trouble with an error using the function fsolve for a system of equations.
f = @(x) [h*(Tinf-T1)+ep*sigma*Ts-ep*sigma*x(2)-x(1); x(1)*(1/rr+1/rc)-(x(2)-Ts); x(1)*r2-(x(3)-x(2)); x(1)*r3(x(4)-x(3))];
x = fsolve(f, [1 1 1 1]);
the error is
Error in Me603HW55 (line 43)
x = fsolve(f, [1 1 1 1]);
Caused by:
Failure in initial objective function evaluation. FSOLVE cannot continue.

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回答（1 个）

Walter Roberson
Walter Roberson 2022-4-23
x(1)*r3(x(4)-x(3)
That code tries to index r3 at location x(4)-x(3)
Remember, MATLAB has absolutely no implied multiplication. NAME(EXPRESSION) is always either array indexing or function invocation, and never means multiplication of the content of NAME by the EXPRESSION .

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