advance a vector coordinates in a loop

3 views (last 30 days)
Lama Hamadeh
Lama Hamadeh on 20 Mar 2021
Commented: KSSV on 20 Mar 2021
Hi all,
I'd like to advance an intial vector forward in something similar to this:
where the blue arrow is the initial one, and the the green is the next one, and so on so forth. The code I have at the moment is:
%angle of the norm
theta_norm = pi/2;
%length of the vector (radius)
r = 0.7071/2;
%Initialise the arrow on the xy grid
x0 = 0.5; %initial x position
y0 = 0; %initial y position
%looping
for i = 1:4
%the angle between the vector and the norm (orientation)
theta = i*theta_norm - theta_xaxis;
%find out the Cartesian coordinates
x = r*cos(theta);
y = r*sin(theta);
%draw an arrow in each loop
quiver(x0,y0,x,y,0,'b','LineWidth',3) %here is my problem!!
pause(0.1)
end
Any help would be appreictaed! Thanks.

Answers (1)

KSSV
KSSV on 20 Mar 2021
m = 25 ; n = 25 ;
x = linspace(0,1,m) ;
y = linspace(0,1,n) ;
dx = min(diff(x)) ;
dy = min(diff(y)) ;
dxy = sqrt(dx^2+dy^2) ;
[X,Y] = meshgrid(x,y) ;
%length of the vector (radius)
r = 0.7071/2;
theta = pi/4 ;
%Initialise the arrow on the xy grid
x0 = 0.5; %initial x position
y0 = 0; %initial y position
%looping
for i = 1:4
%the angle between the vector and the norm (orientation)
r = r+dxy ;
%find out the Cartesian coordinates
x = r*cos(theta);a = pi/4 ;
y = r*sin(theta);
%draw an arrow in each loop
plot(X,Y,'.r')
hold on
quiver(x0,y0,x,y,'b','LineWidth',3) %here is my problem!!
hold off
drawnow
pause(0.1)
end
  2 Comments
KSSV
KSSV on 20 Mar 2021
Include another loop for x0 and y0.

Sign in to comment.

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!