advance a vector coordinates in a loop

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.

Answer 1

[KSSV]

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

[Lama Hamadeh]

Thanks for your reply and attempt to help! But when running your code, the blue arrow is still in the (x0=0.5,y0=0) poistion, i.e., it hasn't moved/translated to the second poition (x0=1,y0=0.5), and next to the third (x0=0.5,y0=1), and so on to the fourth position (x0=0,y0=0.5), which was my main problem.

Thanks.

[KSSV]

Include another loop for x0 and y0.