Undefined function or variable

Hello All,

I get this error

Undefined function or variable "uw".

Error in myoz>elj (line 292)
ua=exp(-beta*(uw + cb));

Error in myoz (line 66)
U11=elj(r,sig11,eps11,beta,Lb,q1,q1);

How to solve it? Can anyone please help me to solve it?

This is my code

function [h,c]=myoz
global L U rho iopt 
iopt = 0; % Hyper-netted Chain
n=8193;
eps11=1.0; eps12=0.7; eps22=0.5;
sig11=10.0; sig12=6.0; sig22=1.0;
q1=-2.0;q2=+1.0;
rho1= 0.25*10^(-4);
rho2=(-rho1*q1)/q2;
beta=0.40093; 
Lb= 0.0036069; 
dx = sig11/300; L = (n-1)*dx; r=0:dx:L; r=r';
dt= pi./L;
rho=[rho1',rho2']';
%U=elj(r,sigma,epsilon,beta);
U11=elj(r,sig11,eps11,beta,Lb,q1,q1); 
U12=elj(r,sig12,eps12,beta,Lb,q1,q2); 
U22=elj(r,sig22,eps22,beta,Lb,q2,q2);
U=[U11',U12',U22']';
tol=[1.d-8,1.d-8];
x=zeros(6*n,1);
parms=[40,80,-0.9];
[sol, it_hist, ierr] = nsoli(x,'oz',tol);
%
%%Unpack h and c.
%
h11=sol(1:n);h12=sol(n+1:2*n); h22=sol(2*n+1:3*n);
c11=sol(3*n+1:4*n); c12=sol(4*n+1:5*n); c22=sol(5*n+1:6*n);
g11= h11+1; g12= h12+1; g22= h22+1;
cd=cdirect(c12,c22);
ceff=c11+cd;
if h11~=0.0
  veff = h11-ceff-log(1.0+h11);
else
  veff=0.0;
end
h111= (exp(-veff+h11-ceff))-1;

function u= elj(r,sigma,epsilon,beta,Lb,q1,q2)
n2=length(r);
ra=r(2:n2);
r12=(sigma./ra).^12; r6=(sigma./ra).^6;
%cb =((q1*q2)./(4*pi*epsilon0*ra*0.59616));
%u = uwca+cb;
cb = ((Lb*q1*q2)./(beta*ra));
uj= 4*epsilon*(r12-r6);
us=0.25*epsilon;
if ra <= 1.12246*sigma
  uw = uj+us;
else
  ua=exp(-beta*(uw + cb));
end
u=[0,ua']';

Answer 1

[Adam]

'uw' is defined in an if statement, but used in the else part of the same if statement where it is guaranteed not to be defined.

[Uday padidela]

Thank you Adam.. Yeah i solved it..Thank you for your time.

Answer 2

[dpb]

function u= elj(r,sigma,epsilon,beta,Lb,q1,q2)
...
if ra <= 1.12246*sigma
  uw = uj+us;
else
  ua=exp(-beta*(uw + cb));
end

There's no path to have uw defined in the function if the else clause is taken...only if the condition is true will there be a value for uw defined.

[Uday padidela]

Thank you.. I have solved it.