f

#### ??? Output argument "r" (and maybe others) not assigned during call to "/home/mat/nonlinear_g.m>nonlinear_g".

```Hi,

I have been writing a code to solve a nonlinear system of waves and I am using the Newton -Raphson method to solve the system. I have a main program which computes the Jacobian and solves the linar system and I have a function which I discretise my system of equations.

I get an odd error of:
??? Output argument "r" (and maybe others) not assigned during call to "/home/mat/nonlinear_g.m>nonlinear_g".
My function that I have written is:
function r=nonlinear_g(s,p,L,n,W)
X=W(1:L);
Y=W(L+1:2*L);
u=W(2*L+1:3*L);
v=W(3*L+1:4*L);
E_x=W(4*L+1:5*L);
E_y=W(5*L+1:6*L);
h=1;
B=0.2;
E_b=0.1;
E_0=0.3;
U=0.2;
ds=s(2)-s(1);
c=floor(n/L);
d=n-c*L;
if (d==0)
d=L;
end
%Prepare for the Calculation
s_half=zeros(1,L-1);
X_half=zeros(1,L-1);
Y_half=zeros(1,L-1);
u_half=zeros(1,L-1);
v_half=zeros(1,L-1);
E_x_half=zeros(1,L-1);
E_y_half=zeros(1,L-1);
for k=1:L-1
s_half(k)=0.5*(s(k)+s(k+1));
X_half(k)=0.5*(W(k)+W(k+1));
Y_half(k)=0.5*(W(k)+W(k+1));
u_half(k)=0.5*(W(k)+W(k+1));
v_half(k)=0.5*(W(k)+W(k+1));
E_x_half(k)=0.5*(W(k)+W(k+1));
E_y_half(k)=0.5*(W(k)+W(k+1));

end
switch c
case 0
%r=X_prime(d)^2+Y_prime(d)^2-1;
if (d==1)
r=((4*X(1)-X(2))/3)^2+((4*Y(1)-Y(2))/3)^2-1;
else
r=((X(d)-X(d-1))/ds)^2+((Y(d)-Y(d-1))/ds)^2-1;
end
case 1
a_1=0.5*(u(d)^2+v(d)^2)+p(d)+B*Y(d);
a_2=E_b/(1+(Y_prime(d)/X_prime(d))^2);
a_3=E_x(d)^2-E_y(d)^2;
a_4=(Y_prime(d)/X_prime(d))^2;
r=a_1+a_2*(0.5*a_4*a_3-2*E_x(d)*E_y(d)*sqrt(a_4)-0.5*a_3)-K(d)-0.5*E_b;
case 2
r=Y_prime(d)*u(d)-X_prime(d)*v(d);
case 3
r=X_prime(d)*E_x(d)+Y_prime(d)*E_y(d);
case 4
b_2=(X_half-X(d)).^2+(Y_half-Y(d)).^2;
b_5=(X_half-X(d)).^2+(Y_half-Y(d)+2*h).^2;
r=pi*v(d)-trapz(s_half,(b_1+b_3)./b_2)+trapz(s_half,(b_4+b_6)./b_5);
case 5
c_3=(X_half-X(d)).^2+(Y_half-Y(d)).^2;
r=pi*E_x(d)-trapz(s_half,(c_1+c_2)./c_3);
end

Can anyone suggest where I may have been going wrong?

Mat
``` 0  Mat
11/2/2010 11:03:04 AM comp.soft-sys.matlab  211264 articles. 26 followers. 2 Replies 2420 Views Similar Articles

[PageSpeed] 20

```It's odd, the function only bombs out when the maximum value for the row appears, when this happens, everything goes wrong.

Mat
``` 0  Mat
11/2/2010 12:46:03 PM
```
"Mat " <maff.hunt@googlemail.com> wrote in message
news:iaor58\$nil\$1@fred.mathworks.com...
> Hi,
>
> I have been writing a code to solve a nonlinear system of waves and I am
> using the Newton -Raphson method to solve the system. I have a main
> program which computes the Jacobian and solves the linar system and I have
> a function which I discretise my system of equations.
>
> I get an odd error of:
> ??? Output argument "r" (and maybe others) not assigned during call to
> "/home/mat/nonlinear_g.m>nonlinear_g".

That's correct -- and it only happens when floor(n/L) [aka c in your code]
is something other than 0, 1, 2, 3, 4, or 5, right?

If c is something other than one of those six values, NONE of the cases in
your SWITCH-CASE block will trigger and so you never assign a value to the
variable r.  Then when the function tries to exit, MATLAB tries to obtain
the value of r to return to the calling function, can't find such a
variable, and exits.

To fix this, either figure out why c takes on a value other than those six,
or add a DEFAULT case to your SWITCH-CASE statement that handles the
scenario where c is different appropriately.

*snip most of the code*

> switch c
>    case 0

*snip code that assigns to r*

>    case 1

*snip code that assigns to r*

>    case 2

*snip code that assigns to r*

>    case 3

*snip code that assigns to r*

>    case 4

*snip code that assigns to r*

>    case 5

*snip code that assigns to r*

> end

--
Steve Lord
slord@mathworks.com
comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ
http://www.mathworks.com

``` 1  Steven_Lord
11/2/2010 1:49:13 PM Similar Artilces:

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