Ploting Quarter Circle using for loop

I am supposed to plot the quarter circle below and call the instances from it.

for theta=0:-2.25:-90
 R=.25;
xed=R*cosd(theta)
yed=R*sind(theta)
end

This code gives me the correct values but I cannot call on an instance.

theta=0:-2.25:-90;
for ii=1:length(theta)
 R=.25;
xed(ii)=R*cosd(theta)
yed(ii)=R*sind(theta)
end

This code gives me incorrect values but I can call on an instance.

Answer 1

[David Hill]

t=linspace(0,-pi/2,1000);
[x,y]=pol2cart(t,.25);
plot(x,y);