Secant method Nan Error

hey,

I'm trying to learn how to code the Secant Method,

I think I am getting everything right but the values of my variables are 'NaN'... what does it mean and how can I change it ?

Thanks for the help !

R=3;

f= @(x) (pi.*(x.^2)).*(3.*R-x)-3.*48.25;

X0=2;

X1=3;

Y0= f(X0);

Y1= f(X1);

k=1;

error=1;

while k<10 && error>10^(-6)

X = X1 - (X0-X1).*Y1./(Y0-Y1) ;

Y = f(x);

X0=X1;

X1=X;

Y0=Y1;

Y1=Y;

k =k+1;

end

X

Y

Answer 1

[Alan Stevens]

You haven't updated error in your while loop. Try including something like

error = abs(X0-X1);

[Grégoire]

Perfect ! thanks for the help :)