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# Help me to write a programme

Help me to write a programme to solve mannings equation using
Newton-Raphson method.

Newton-Raphoson metod=
X^(m+1)= X^m - f(x^m)/[df(x^m)/dx]

mannings equation = V= (1/n)*r^(2/3)*s^(1/2)

Jul 23 '05 #1
1 2828
Dumidu wrote:
Help me to write a programme to solve mannings equation using
Newton-Raphson method.

Newton-Raphoson metod=
X^(m+1)= X^m - f(x^m)/[df(x^m)/dx]

mannings equation = V= (1/n)*r^(2/3)*s^(1/2)

Try searching the web, I'm sure there are plenty of
examples out there.

I'll assume double as the numeric base.

double V(double n, double r, double s)
{
return (1.0/n) * pow(r, 2.0/3.0) * pow(s, 0.5);
}

I leave the other equation for the O.P.
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Thomas Matthews

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Jul 23 '05 #2

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