taylor series for loops

not enough input arguments

the error is

coefficient (1) = (vpa(sub(f, x, a))); %storing f(a)

how can I fix this

Answer 1

[Walter Roberson]

coefficient(1) = vpa( subs( f, x, a) )

Notice subs not sub

But this assumes that f is a symbolic expression, or a symbolic function, or an anonymous function that has x as one of its variables. This subs() will not work if f is a direct function. For example,

subs(EXAMPLE, x, a)

function y = EXAMPLE(x)
   y = x^3-3;
end

will not work -- and neither will subs(@EXAMPLE, x, a) in that case.

You might also have recieved the message if that statement were inside a function and at leat one of f or x or a are named parameters to the function, but you called the function without passing in enough parameters.