How do I plot intersection point of a function and y axis in matlab

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Eymen Dogrusever
Eymen Dogrusever 2020-5-23
评论： Walter Roberson 2020-5-23
Sketch the graph of the function y = f(x) and the y-axis onto the same figure. What is the meaning of the point of intersection? Apply the Secant method to solve f(x) = 0 accurate to within 10^(-3) for the equation
A) f(x) = e^x + 2^(-x) + 2 cos(x) ) 6 for 1 ≤ x ≤ 2.
clc;
clear;
x=[1 2];
y=exp(x)+power(2,(-x))+2*cos(x)-6;
plot(x,y)
%Secant method;
f=@(x) exp(x)+power(2,(-x))+2*cos(x)-6;
x0=1;
x1=2;
epsilon=0.001;
err=abs(x1-x0);
if f(x0)*f(x1)>0
disp('enter valid interval!!!')
else
while err>epsilon
x2=(x0*f(x1)-x1*f(x0))/(f(x1)-f(x0));
x0=x1;
x1=x2;
err=abs(x1-x0);
root=x2;
end
fprintf('\n The root is %4.3f ',root)
end
I can solve the secant method part but I can't plot the intersection point of the function and y-axis.
I would appreciate if you can tell me or show me how can I plot?
  1 个评论
Walter Roberson
Walter Roberson 2020-5-23
The interesection point of the function and the y axis is just the point at which the function equals 0. You can plot a marker there or a line such as with xline()

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