Solving a system of two nonlinear equatios

Hello,

I'm new to MatLab and I'm trying to write a program that solves a system of two nonlinear equations in two variables, d and n. The parameters in the two equations are typed by the user with a GUI.

Ds=str2double(get(handles.edit_D,'String'));

P=str2double(get(handles.edit_P,'String'));

H1=str2double(get(handles.edit_H,'String'));

s=str2double(get(handles.edit_s,'String'));

G=81500;
E=206000;

%Now i need to do some operations first, with d and n, so I put syms

syms n d;

H2=H1-s;

sp=H1-Hp;

Di=Ds/0.96;

Dm=Di+d;

%the equations are

(G*d^4)/(8*Dm^3*n)-P/s==0

(G*d*sp)/(pi*n*Dm^2)-0.56*Rm==0

How can I obtain the values of n and d? I need to write an external .m file and use fsolve? In this case, how can I get in the function file the values of the parameters Dm, s, etc.?

Thanks,

Daniele