You did not count the input t when using nargin. You can include the number of inputs before varargin in the logical comparisons:
if nargin < 2 % not 1 !!!!
V0 = -60;
else
V0 = varargin{1};
end
if nargin < 3 % not 2 !!!
I = 0;
else
I = varargin{2};
end
Or change the operator to <= (assuming exactly one input before varargin):
if nargin <= 1 % not <
V0 = -60;
else
V0 = varargin{1};
end
if nargin <= 2 % not <
I = 0;
else
I = varargin{2};
end
Another approach is to simply count the number of elements in varargin, which means that you can write code that is robust against future changes too, because you can change how many inputs there are before varargin.
if numel(varargin) < 1 % not NARGIN
V0 = -60;
else
V0 = varargin{1};
end
if numel(varargin) < 2 % not NARGIN
I = 0;
else
I = varargin{2};
end
