I was trying to solve this problem but it is showing error like??? "Attempt to reference field of non-structure array.."i am not able to find the erro ..please help

w = 4.7;
  E0=6.9;                                                                          
  l=8;                                                                           
  h=4;                                                                                     
  P1=1*10^10;                                                                     
  d0=0.4;                                                                        
  m1=15.6;                                                                         
  m2=2.65;                                                                        
  E1=8.85*10^-21;                                                                
  d=1:10:40;                                                                              
  A0=l.*h;                                                                           
  c=E1./d.^2;                                                                   
  B1=(d./d0).^(1/3);                                                              
  E2=E0.*(1./B1);                                                                
  V=d.*E2;                                                                   
  U0=0.5.*E1.*E2.^2.*(d0./d)^(2/3);                                             
  A1=A0.*U0./P1;
  U1=(U0.*d.A0)./((d+h).*(A0+A1));                                            
  M1=m1.*h.*A1.*10^-24;                                                          
  M2=m2.*(d+h).*A0.*10^-24;                                                       
  U2=(U1./(M1+M2))*10^27;                                                        
  x1=E2.*E1;
  X2=E1.*E2./(d+h);
  C1=c.*d./((d+h).*(1+A0/A1));                                                       
  R=d./x1.*A1;
  C=c.*d.*A1;
  T=R.*C;
  P=U2./T;
  plot(d,U2)
   "Attempt to reference field of non-structure array.."

Answer 1

[Walter Roberson]

Look at your line

U1=(U0.*d.A0)./((d+h).*(A0+A1));

you missed * between the d. and the A0

U1=(U0.*d.*A0)./((d+h).*(A0+A1));

[an]

Thanks a lot it workedd.