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How to properly use nargin

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I'm trying to use nargin to set a default input for a function, should that default not be previously defined by the user. I'm setting up the nargin loop in the same format my teacher used, however, I'm getting an error saying N is undefined, which is technically the point. Irronically I ran my teachers function and it also had the same error... so I'm a little stuck at the moment.
This is my function at the moment.
function y = estimate_pi_Leibniz_Clark_Brendan(N)
if (nargin == 0)
N = 10;
end
p = 0 ;
for k = 0:N
p = p + 4*((-1)^(k)*(1/(2*k+1)));
end
y=p;
  2 Comments
Brendan Clark
Brendan Clark on 25 Apr 2021
I just attempted to run in by entering
y = estimate_pi_Leibniz_Clark_Brendan(N)
into the command window, when I preset N the function works exactly how its supposed to, it only kicks back an error when I attempt to run it without predetermining N.

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Accepted Answer

the cyclist
the cyclist on 25 Apr 2021
Edited: the cyclist on 25 Apr 2021
When you tried to call it like this:
y = estimate_pi_Leibniz_Clark_Brendan(N)
the problem is that in the calling workspace, the variable N does not exist, which is why you get that error. (The error is from the calling workspace, not from your function.)
Instead you could have called it as
y = estimate_pi_Leibniz_Clark_Brendan()
which would trigger your nargin statement.
  1 Comment
Brendan Clark
Brendan Clark on 25 Apr 2021
I appreciate the explanation, knowing about why those weird errors populate really helps me moving forward.

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