global and workspace

%% Problem: pass variables efficiently to f2 without globals or workspace
% % uncomment and run this once: then comment it and run the code.
% % I saved the function under the name functiontester.m
% Aa1 = 1;
% Bb1 = 2;
% x0_001 = 0.1
% x0_002 = 0.2
% constant_1 = 0.3
% constant_2 = 0.4
% save ('w.mat')

function f1_v3 % parent function that does the solving

clc
clear all
tic

load w.mat;

A=rand(100,2)
% Ive got several loops before this function
for i=1:100 % with loops before this, I have to call it >10000 times
x0=[x0_001 * A(i,1), x0_002 * A(i,2)]
options = optimset('MaxFunEvals', 1000,'MaxIter', 1000, 'Display', 'on');
[x,fval,exitflag,output,jacobian] = fsolve(@f2v3,x0,options) % calling f2
end
toc
end


function F=f2v3(x) % almost all my variables are used here
% pick your poison - either comment load w or globals. I want neither.

% load w.mat;
global Aa1 Bb1 constant_1 constant_2

Aa1 = x(1)
Bb1 = x(2)

r_1 = constant_1*Aa1*Bb1
r_2 = constant_2*Aa1+Bb1

F = [Aa1 - Bb1
    r_1 - r_2];
end