Implicit differentiation in matlab

[oby7842]

I have a implicit differential equation Re(u*ux-u^2)=0 ( It was larger equation but i simplified it here). I wrote down my function in m.file as follows:

function Z=fun_imp(x,u,ux);
Re=25;
Z=0;
Z=Re*(u*ux-2*u);

Before going to solving differential equation to find out consistent initial value i write following prog:

clc;
clear;
x0=0;
u0=-1.095;
ux0=0;

[u0,ux0]=decic('fun_imp',x0,u0,1,ux0,0);



but I am geting following error:


? Error using ==> initial
Not enough input arguments.

I will appreciate if anyone ans my question.

regards,
Omar

 

[NateD]

It looks like you are using the wrong function for solving the differential equation. The correct function for solving this kind of equation is ode45 or ode15s. These functions are part of the MATLAB ODE suite, and they are designed to solve initial value problems involving ordinary differential equations. You should use one of these functions instead of decic.