How to properly use nargin

16 views (last 30 days)
Brendan Clark
Brendan Clark on 25 Apr 2021
Commented: Brendan Clark on 25 Apr 2021
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
Jonas
Jonas on 25 Apr 2021
looks good, how did you run your function?
Brendan Clark
Brendan Clark on 25 Apr 2021
Edited: 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.

Sign in to comment.

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.

Sign in to comment.

More Answers (0)

Categories

Find more on Simulink Environment Customization in Help Center and File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!