Plotting help. No line or points appearing on plot
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So, im trying to write a script to plot x=x1 + tV1cos(theta). The figure will generate but no points. What can I do to fix this? Any help would be extremely appreciated. Thank you in advance
%% Get user input
launch_angle= input('Enter launch angle in degrees : ');
xo = input('Enter initial x position in meters: ');
xt = input('Enter target x position in meters: ');
yt = input('Enter target y position in meters: ');
tt = input('Enter target hitting time in seconds: ');
te = input('Enter end time in seconds: ');
g=9.8;
% Calculate Vo
vo = (xt-xo)/(tt*(cos(launch_angle * (pi/180))))
%% Display the result
disp(['Initial Velocity in metres per second is: ', num2str(vo)]);
%% Calculate yo
yo = yt - (tt*vo*(sin(launch_angle * (pi/180))))+(0.5*g*tt^2)
%% Display the result
disp(['Initial y positon in metres is: ', num2str(yo)]);
%% Equations to plot End pt
xe = xo + (te*vo*cos(launch_angle * (pi/180)))
ye = yo + (te*vo*(sin(launch_angle * (pi/180))))-(0.5*g*te^2)
%% Plot end point
figure
plot(xe',ye','-r');
1 个评论
Mathieu NOE
2020-10-22
Hi
I suspect you wanted to plot the full trajectory, but you're simply plotting one (the end) point
If you don't see it maybe it's because you have not choosen the right options : try : plot(xe',ye','*r');
nvertheless, you have to write the equation of the trajectory first before you can plot it
采纳的回答
You need to make time as vector. Then you can plot the trajectory, if i understand it right.
See the code below, it plots xe vs ye according to your prog
launch_angle= input('Enter launch angle in degrees : ');
xo = input('Enter initial x position in meters: ');
xt = input('Enter target x position in meters: ');
yt = input('Enter target y position in meters: ');
tt = input('Enter target hitting time in seconds: '); % total time to hit target in s
te = input('Enter end time in seconds: '); % end time at which target is destroyed
g=9.8;
te = tt:-0.1:te; % calculate the time vector
% Calculate Vo
vo = (xt-xo)/(tt*(cos(launch_angle * (pi/180))))
%% Display the result
disp(['Initial Velocity in metres per second is: ', num2str(vo)]);
%% Calculate yo
yo = yt - (tt*vo*(sin(launch_angle * (pi/180))))+(0.5*g*tt^2)
%% Display the result
disp(['Initial y positon in metres is: ', num2str(yo)]);
%% Equations to plot End pt
xe = xo + (te*vo*cos(launch_angle * (pi/180)))
ye = yo + (te*vo*(sin(launch_angle * (pi/180))))-(0.5*g*te.^2)
%% Plot end point
figure
plot(xe',ye','-r');
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