Plotting points of intersection using Newton Raphson
16 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
Jane Smith
am 18 Apr. 2021
Kommentiert: Jane Smith
am 18 Apr. 2021
I am creating a raw code for the Newton raphson method using a while loop like so
x=1;
xold=0;
i=0;
format short
while abs(x-xold)>.01
f = sin(x)-cos(x);
f_1 =cos(x)+sin(x);
xnew = x - y/dy;
i = i+1;
xold = x;
end
plot([xnew], [0.719], '*r' )
plot([new], [-0.719], '*r' )
This is after plotting the 2 graphs before cos(x) and sin(x). Now i would like to plot the points of intersection that were found through the newton raphson's method.
The last 2 lines of the code are incorrect as when i tried some different values i was getting 2 points.
0 Kommentare
Akzeptierte Antwort
Thiago Henrique Gomes Lobato
am 18 Apr. 2021
Your last line use fixed values, so it will only work for one case. Additionally there was an error in the order of the variable assignment on the loop. Following code should work:
x=0;
xold=inf;
i=0;
format short
while abs(x-xold)>.01
xold = x; % This should be done before the calculation, otherwise you have only 1 iteration
f = sin(x)-cos(x);
f_1 =cos(x)+sin(x);
x = x - f/f_1; % Note f and f_1 instead of y and dy
i = i+1;
end
figure
xplot = linspace(-8,8,100);
plot(xplot,cos(xplot)),hold on
plot(xplot,sin(xplot))
plot([x], cos(x), '*r' )
plot([x], sin(x), '*r' )
Weitere Antworten (0)
Siehe auch
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!