Why does fzero returns initial guess.
1 view (last 30 days)
Show older comments
My script is below, whenever I enter this script into Matlab it returns to me my initial guess. I am curious Why? All help appreciated.
q = 10
theta = 135
Q = 600
z = 20
P = @(x,y) q*sin(theta)*x - q*cos(theta)*y - Q./(2*pi*z)*atan((x./y));
D = []
for x = -10:10;
for y = -10:10;
E= P(x,y);
D = [D;E,x,y];
end
end
%to check if the equation T (psi) works for root finding equation
T = @(x,y) q*sin(theta)*x - q*cos(theta)*y - Q./(2*pi*z)*atan((x./y))-P(x,y);
L = [];
for x = -10:10;
for y = -10:10;
Q=T(x,y);
L = [L;Q];
end
end
R=[]
x = [];
for y = -5:5;
[yi]= fzero(@(x) T(x,y),25);
x=[x;yi,y]
end
0 Comments
Accepted Answer
Star Strider
on 26 Sep 2016
Your ‘T’ function is for all intents and purposes ‘P(x,y)-P(x,y)’. The fzero function detects zero-crossings, and ‘T’ is zero everywhere:
P = @(x,y) q*sin(theta)*x - q*cos(theta)*y - Q./(2*pi*z)*atan((x./y));
T = @(x,y) q*sin(theta)*x - q*cos(theta)*y - Q./(2*pi*z)*atan((x./y))-P(x,y);
0 Comments
More Answers (0)
See Also
Categories
Find more on Function Creation in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!