How I can minimize an objective function having five variables (one vector and four parameters)?

Dear all

I want minimize an objective function of following type:

fun = (@ (???)) (A*x - b)^2 + a*(exp(-b*z) - c*exp(-d*z))

where x is a vector (initial guess suposse zeros(29,1)), while a,b,c,d are parameters (initial guess suposse a =1 b = 2 c = 3 d = 4)--> I need find this 4 values and vector x.

A(matrix), b(vector) and z (vector) are given.

All my best

Blessings

[Walter Roberson]

You are asking to minimize a vector. What does that mean?

Did you want to minimize the sum of squares of the values?