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Undefined function or variable error even though function is saved

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Keep getting the message "undefined function or variable"..I'm trying to create this function to pass to a genetic algorithm to optimise for three variables (k1,k2,k3) but even when I test it I get an error. It saves as a .m file though. What's going wrong?
function y = newFitness(k)
% Define constants
AU = astroConstants(2);
mu = astroConstants(4);
% Define start and finish parameters for the exponential sinusoid.
r1 = AU; % Initial radius
psi = pi/2; % Final polar angle of Mars/finish transfer
phi = pi/2;
theta_dot = sqrt( mu/(((r1/exp(k(1)*sin(phi)))*exp((k(1)*sin(k(2)*(psi + 2*pi*k(3))+phi))))^3) * 1/(tan(atan(k(1)*k(2)*cos(k(2)*(psi + 2*pi*k(3))+phi)))^2 + k(1)*k(2)^2*sin(k(2)*(psi + 2*pi*k(3))+phi) +1) );
y = theta_dot - 94608000;
Edit: Following on from one of the suggestions below, there arises the following information : The function can be found apparently.
which newFitness
Y:\MATLAB\newFitness.m
So here is the genetic algorithm code that I am trying to pass it on to. I'm not sure why that is important, because before I even touch the GA code, I try and test my function by typing :
newFitness([1 2 3])
Which still gives me an error message of "Undefined function or variable 'newFitness'". But here's the GA code anyways.
clc;clear;
objective_function = @newFitness;
nvars = 3;
[k,fval]=ga(objective_function,nvars);
  6 Comments
Geoff Hayes
Geoff Hayes on 18 May 2018
Harvey - is the newFitness function in the MATLAB search path? In the command window, type
which newFitness
to see if the function can be found. If not, then add it to the search path. If it can be found, then there might be something wrong with the code that is trying to pass this function to the GA...so please copy and paste that code (which is throwing the error) to your question.

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Accepted Answer

Harvey Rael
Harvey Rael on 18 May 2018
*Update* : MATLAB is a cruel mistress. I turned off my computer last night after many attempts (and after asking this question) when nothing worked. Turned it on again this morning without touching any code at all.. it works enough to give me answers. I don't know why, all paths are the same. Now I just need to provided constraints..
Thanks for all your help!

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