Function function/ passing function/ varargin help?

Develop a function function M-file that returns the difference between the passed function's maximum and minimum value given a range of the independent variable. In addition, have the function generate a plot of the function for the range. Test it for the following cases:

f(t) = a*exp^(-b*t)*sin(t-c) from t = 0 to 6*pi

1. a = 8, b = 0.25, c = 2 below is what I have so far. I keep getting an error. I don't know what I am doing wrong. .I would appreciate any help that you could provide. Thank you.

%input: 
%   a = lower bound of range
%   b = upper bound of range 
%   n = number of intervals 
%output: 
%   fdiff = difference between max and minimum of a function 
function fdiff = funcdiff(f, a, b, n, varargin)

x = linspace(a,b,n); 
y = f(x, varargin{:});
fdiff = max(y) - min(y); 
fplot(f, [a b], varargin{:})
end 

% clear clc
% diff = @(t) a*exp^(-b*t)*sin(t-c); 
% funcdiff(diff, 0, 6*pi, 180, 8, 0.25, 2)

[Stephen23]

https://web.archive.org/web/20201026060955/https://www.mathworks.com/matlabcentral/answers/624548-function-function-passing-function-varargin-help

Answer 1

[KSSV]

a = 8 ;
b = 0.25 ;
c = 2 ; 
n = 180 ; 
f = @(t) a*exp(-b*t).*sin(t-c);  


t = linspace(a,b,n); 
y = f(t);
fdiff = max(y) - min(y); 
plot(t,y)

[Gabrielle Bartolome]

I am not sure I really understand the code you placed. It seems to work by itself but not as a funciton function and it doesn't use varargin.

[Cole Fontana]

Don't worry I'm just as stuck as you are lol

Professor Huang said that we can't use fplot when using varagin.