Using An Equation As An Input Argument For A Function

Hello,

I am trying to write a function that takes an equation (fx) in as input argument and solves for it using two separate bounds (fl) (fu).

For example say the equation is: x^8-1.5=0

How would I go about getting the equation input as my fx value? Do I have to use f=@x somehow?

Thanks in advance for any help. ~Mike

Answer 1

[Mischa Kim]

Mike, check out the code below:

 function fun_test()
 f    = @(x) x^8 - 1.5;
 xl   = 0;
 xu   = 1;
 sol  = fun_solve(f, xl, xu);
 disp(sol)
 end

 function fsol = fun_solve(f,xl,xu)
 x    = (xu + xl)/2;
 fsol = f(x);
 end

Since I'm not quite sure what exactly you would like to solve for, I am simply evaluating the function at the midpoint.

[Mike]

Mischa,

My actual problem ended up just being that I was not using parenthesis for my variable.

ie @x instead of @(x)

Thanks for the response though.