Newton's Method to Solve Equation

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Tyler Bodnarik
Tyler Bodnarik on 12 Sep 2021
Answered: Yongjian Feng on 12 Sep 2021
I trying to write a code to solve an equation using newton's method and given three inputs.
So far I have
syms L h T g
f_L = L-g*T*T/(2*pi)*tanh(2*pi*h/L)
Df = diff(f_L,L)
The variable Df is in symbolic form but I need to convert it to numeric. Any ideas how to do this?
Thank you

Answers (1)

Yongjian Feng
Yongjian Feng on 12 Sep 2021
You need to substitute symbols with values, right?
L = 1.0;
h = 2.0;
T = 3.0;
g = 9.8;
% substitute
ret = subs(Df);
% convert
res = double(ret);

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