How to Help Determine the Roots of X =Tan(X), Graph Y = X And Y = Tan(X), And also plot a red circle At The Intersection Points Of The Two Curves. Please help.

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juan sanchez
juan sanchez 2023-5-17
编辑： Nikhil Baishkiyar 2023-6-24
clear all
close all
clc
% %%To plot tan(theta), if you use usual plot function
% and linspace, you get a cntinuous function like this
% to use fplot, you have to initiate function
%%y=tan(x) function theta in radians=180 deg/Pi
f=@(theta) tan(theta) %@(theta) mean f is a function on theta
%%y=tan(x) function theta in degrees
%f2=@(theta) tand(theta); % tand(theta) theta is in degree
%%y=x straight line function theta in radians=180 deg/Pi
f3=@(theta) theta; %straight line y=x
%Plot the functions
figure
fplot(f,[-2*pi,2*pi]);
% figure
% fplot(f2,[-360,360]);
hold on
fplot(f3,f3)
ylim([0 6])
xlim([0 6])
%Note fplot have the same syntax as ezplot
%%FIND x VALUE IN THE FOLLOWING ITERATION%%%
tanxx = @(x) tan(x)-x
for a = 4:4.6
xs = fzero(tanxx, a)
end
%I've tried to use this function 'Intersections' but could not make it work. Detect Curve Intersections, Quickly and Easily » File Exchange Pick of the Week - MATLAB & Simulink (mathworks.com)
  2 个评论
Steven Lord
Steven Lord 2023-5-17
What does "could not make it work" mean in this context?
  • Do you receive warning and/or error messages? If so the full and exact text of those messages (all the text displayed in orange and/or red in the Command Window) may be useful in determining what's going on and how to avoid the warning and/or error.
  • Does it do something different than what you expected? If so, what did it do and what did you expect it to do?
  • Did MATLAB crash? If so please send the crash log file (with a description of what you were running or doing in MATLAB when the crash occured) to Technical Support so we can investigate.
juan sanchez
juan sanchez 2023-5-18
I meant that the 'intersections' function did not worked for my posted code. I wanted to know how to make this function 'intersections' work and then be able to plot the roots as red circle markers on the plot.

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Nikhil Baishkiyar
Nikhil Baishkiyar 2023-6-23
编辑：Nikhil Baishkiyar 2023-6-24
Have you seen the example given for the function intersections? It computes the intersection of two vectors, not two function handles. I have tried it and found the solution. You can use
x = 0:0.0001:5;
f = tan(x);
f3 = x;
I used these vectors in the same way as this example and got what you wanted.

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