MATLAB: How to write a function of x in a function

evaluatefunctionMATLAB

Im just getting started in Matlab and I cant figure this out

I want to write a function of x and then the value of x inside a function

For example a = Evaluate((x^2)+1, 2)

And I want it to give me the answer. Which should be 5.

function [a] = Evaluate(f(x),x)

end

Thanks!

function a = Evaluate(f, x)
  a = f(x);
end

Which might be called like

Evaluate(@(x) (x^2)+1, 2)

n=given;

i=1:2^(n-1); %gives you array of integers from 1,2,...2^(n-1)

% let's say your function is f=2i;

f=2*i;

yoursum=sum(f);

The Symbolic Math Toolbox has the finverse function:

syms x 
f(x) = (x^2 - 1);
finv = finverse(f)

producing:

finv(x) = 
(x + 1)^(1/2)

To do this numerically, use the fsolve function, for example:

x = fsolve(@(x)(x.^2-1) - y, x0)

where ‘y’ is the value to solve ‘x’ for, and ‘x0’ is the intial estimate.