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1-AUG-2019 SolveSys - Equation Library and Nonlinear Systems Solver
03-09-2017, 05:04 AM
Post: #52
RE: 08-MAR-2017 SolveSys - Equation Library and Nonlinear Systems Solver
(03-09-2017 04:56 AM)math7 Wrote:  Thanks to Han for this important program !!! I was testing some equations and in the electricity section when I try to solve resistors in parallel, enter the values for r1 and r2 and when I try to solve Rp and Rs, the program shows me the message "Error evaluating F!".

\( \mathbf{F} \) here refers to the vector
\[ \mathbf{F} = \begin{bmatrix} f_1(x_1, x_2, \dotsm, x_m) \\ f_2(x_1, x_2, \dotsm, x_m) \\
\vdots \\ f_n(x_1, x_2, \dotsm, x_m) \\ \end{bmatrix} \]

where each \( f_i(x_1,x_2,\dotsm , x_m) \) corresponds to the \(i\)-th equation \( f_i(x_1,x_2, \dotsm, x_m) = 0 \). In other words, if your equation was \( x_1+x_2 = 5 \) then \( f(x_1,x_2) = x_1+x_2 - 5 \) is the function equivalent. So what does the message mean when there is an error evaluating \( \mathbf{F} \)? Look at your initial guess for \( R_p \) -- it's 0. This results in division by 0 in the equation involving \( R_p \). This just means you picked a poor initial guess -- try a value that does not lead to division by 0.

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RE: 08-MAR-2017 SolveSys - Equation Library and Nonlinear Systems Solver - Han - 03-09-2017 05:04 AM
Not able to solve a system - rrpalma - 05-05-2019, 08:10 PM



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