Newton's Method to Solve Equation

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Tyler Bodnarik
Tyler Bodnarik 2021-9-12
回答： Yongjian Feng 2021-9-12
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

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回答（1 个）

Yongjian Feng
Yongjian Feng 2021-9-12
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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