matlab - How to load variables from a parent code? -

i have following "parent" code, call solve.m:

s1 = .01; v = 1; fun1 = @rootd; x0 =  [.2, .3, .4] options = optimset('maxfunevals',100000,'maxiter', 10000 ); x1 = fsolve(fun1,x0, options) 

i have following code function rootd.m

function d = rootd(x1) f = @(p) 1 - ((3.*x1(3).^2 - 7.*x1(3) + 6).*(x1(2)./p -1))./(2.*x1(3).*(1-x1(3))); h = @(p) (1 - ((3.*x1(3).^2 - 7.*x1(3) + 6).*(x1(2)./p -1))./(2.*x1(3).*(1-x1(3)))).^2;  f1 = @(p) 1 - ((6 - 7.*x1(3) + 3.*x1(3)^2).*(min(v,x1(2))./p - 1 ))./(2.*x1(3).*(1-x1(3)));  h1 = @(p) (1 - ((6 - 7.*x1(3) + 3.*x1(3)^2).*(min(v,x1(2))./p - 1))./(2.*x1(3).*(1-x1(3)))).^2;   g = @(p) integral(@(p) f(p), x1(1), x1(2));  f = @(p) integral(@(p) f1(p), x1(1), (min(v,x1(2))));   h = @(p) integral(@(p) h1(p), x1(1),(min(v,x1(2))));  d(1) = g(x1) - s1;  d(2) = x1(3).*(2-x1(3)).*(v - min(v, x1(2))) - (((x1(3)^2)/2).*h(x1)) + (2.*x1(3)...  - (1/2).*x1(3).^2).*f(x1) - ((v-min(v, x1(2))) + f(x1) -s1);  d(3) = (6 - 7.*x1(3) + 3.*x1(3)^2).*min(v, x1(2))./((2-x1(3)).*(3-x1(3))) - x1(1); end 

when run parent code, obtain:

undefined function or variable 's1'.

i understand need define variable s1 in rootd.m function. function automatically loads s1 solve.m.

unless make variable global can not access it. might not best idea in matlab.

you can pass variable in parameter function.

s1 = .01; fun1 = @(pars)rootd(s1,pars); 

this defines rootd single parameter function (something several of optimization function require), although can pass multiple one. rootd function can this:

function d = rootd(s1,x1)     ... end