No Arrows showing in plot When using quiver

I am unable to getting the arrows in the plot by using the quiver. Plot shows all the calculated data tip values but not showing the arrows.

Code as given below. Please help me for this problem.

[X,Y]=meshgrid(-2.5:0.1:2.5,-2.5:0.1:2.5);

Ur=(1+((Y-X)/2.5)-((X*Y)/(2.5^2)));

for i=1:size(X,1)

for j=1:size(X,2)

Uz1(i,j)=(3-(3.75/X(i,j)));

end

end

figure(1)

q=quiver(X,Y,Ur,Uz1,'ShowArrowHead','on','LineWidth',1,'MarkerSize',3);

q.Color = 'red';

q.AutoScaleFactor='1';

Answer 1

[VBBV]

[X,Y]=meshgrid(linspace(-2.5,2.5,10));
Ur=1+((Y-X)/2.5)-((X.*Y)/2.5^2);
for i=1:size(X,1)
    for j=1:size(X,1)
               Uz1(i,j)=(3-(3.75/X(i,j)));
    end
end
figure(1)
q=quiver(X,Y,Ur,Uz1,'LineWidth',1);
q.Color = 'red';

If you use autoscale factor along with arrowhead on it will distort the quiver diagram and misintrepret the plot.

[ASHISH CHAUDHARI]

Thank you very much for answer and prompt reply.

[VBBV]

The problem that quiver function may have is that when you specify an interval width(closely spaced)for an X or Y range , the resulting values produced by expressions for U or V may not appear due to grid mismatch and quiver plots are usually vectors with a specific direction. Its safer if you use default intervals produced by functions such as linspace or directly by a : operator available in Matlab.

If it solved your problem please accept the answer :)

[ASHISH CHAUDHARI]

Thank you sir for your responce. Similar problem is occuring when using closely spaced interval for meshgrid. I have one dought about, how to use the quiver function for different range for X and Y grid? as an example:

[X,Y]=meshgrid(-5:0.1:5,0:0.1:5);

[VBBV]

[X,Y]=meshgrid(-5:0.1:5,0:0.1:5);
U = sin(Y);
V = cos(X); %e.g from doc ref page 
quiver(X,Y,U,V)

[ASHISH CHAUDHARI]

Thank you sir.

[VBBV]

If it solved your problem, pls accept the answer

[ASHISH CHAUDHARI]

Thank you for your humble responce. It has been solved my problem with your solution.