Suppose we have a function defined as:
function(f, df, x0)
where f is a function, df is its derivative, and x0 is an initial point. How do we defined f on the command line? Do you use an inline definition? What about df and x0? What if df is a gradient? Also if x0 is an ordered pair, how do you define it in the command line?
To pass a function as a variable, you need to use a function handle. A simple way to demonstrate this is to use a function handle to an anonymous function. A simple anonymous function can be defined as follows:
handle = @(arglist)anonymous_function
So, to make an anonymous function that adds 2 numbers, you could do something like the following:
f = @(a,b)a+b;
You can use this like any other function
>> f(1,2)
ans =
3
If df is just a simple numeric value, it can be defined as follows:
df = 0.4
To define a pair of values, you could do it like so:
X0=[1 2]
Finally, you can put it all together with this example function (put this in a file called myfunc) . . .
function out = myfunc(f,df,x0)
out = df * f(x0(1), x0(end));
Is this what you want? I was slightly confused by "x0 is an ordered pair".
