Solve multivariate equation using fsolve()

Hi, i have written a multivariate function f(x, a, b, c). Holding a, b, c values fixed, i want to know for what value of x the function f() results in a value of 2. How do I use fsolve to solve this equation? Fsolve seems to be solving only equation f() = 0, so how do i change the objective value 0 to 2?

many thanks Steven

Answer 1

[Star Strider]

You are apparently starting with:

f = @(x, a, b, c) Something;

although I have no idea what ‘Something’ may be.

I would do this:

x0 = ...;                                   % Initial Estimate For ‘x’
Xval = fsolve(@(x) f(x,a,b,c) - 2, x0);     % Solve For ‘f(x) = 2’

You may be able to use fzero for this as well.