for loop skipping an iteration

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Nushaer
Nushaer on 27 Oct 2022
Commented: Nushaer on 27 Oct 2022
My code is for simulating Buffon's Needle throwing experiment.
So I wanted to simulate the throwing needles part. The following code was supposed to create 3 figures each with 10, 100 and 1000 needles respectively.
fig=0;
n=[10 100 1000];
for n=n
fig=fig+1;
figure(fig)
hold on
for s=1:n
needle
end
hold off
end
function needle
mid_x=0.5+9*rand(1,1);
mid_y=0.5+9*rand(1,1);
slope=tan(2*pi*rand(1,1));
x1=mid_x+1/sqrt((1+slope^2));
y1=slope*(x1-mid_x)+mid_y;
x2=mid_x-1/sqrt((1+slope^2));
y2=slope*(x2-mid_x)+mid_y;
plot([x1 x2],[y1 y2])
end
however, it's showing two figures; one titled figure 1 but with 100 lines and the other figure 3 with 1000 lines. Can anyone tell me where the problem is?
  2 Comments
Nushaer
Nushaer on 27 Oct 2022
I'm just starting out. Thanks for the tip.

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Accepted Answer

Karim
Karim on 27 Oct 2022
I would use a separate variable for the for-loop. See below with the adjusmtents.
n = [10 100 1000];
for i = 1:numel(n)
figure(i)
hold on
for s = 1:n(i)
needle
end
hold off
grid on
title("Figure with "+num2str(n(i))+" needles")
end
function needle
mid_x=0.5+9*rand(1,1);
mid_y=0.5+9*rand(1,1);
slope=tan(2*pi*rand(1,1));
x1=mid_x+1/sqrt((1+slope^2));
y1=slope*(x1-mid_x)+mid_y;
x2=mid_x-1/sqrt((1+slope^2));
y2=slope*(x2-mid_x)+mid_y;
plot([x1 x2],[y1 y2])
end

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