How to plot four variables in a line graph ?

I have one equation with 4 variables (x,y,z,d).I substitute the variable x in the equation and have 3 variables. I want to plot with 3 variables in a line graph.

How can I plot this graph? Thank you very much for your answer :)

[KSSV]

Show us the equation....I guess there would be some range to other variables as well i.e for (x,y,z)

[chayanon summueang]

I have 4 varaibles (x4,y4,z4,d) and substitute x4 in equation of volume numerical intergration (UU).I want to plot potential and range of varaible d in a line plot.Thank for help :)

[KSSV]

Copy the code....no image snippets.....

[chayanon summueang]

% range of varaibles (x4,y4,z4)

x4 = 2.1*(10^-9);      

y4 = -8*(10^-9):1*(10^-9):8*(10^-9); 

z4 = -8*(10^-9):1*(10^-9):8*(10^-9);

% range of varaible d

d =   2*(10^-9):1*(10^-9):5*(10^-9);

% Volume integration 

Vx3d = -2*(10^-9);

Vx3t =  2*(10^-9);

Vy3d = -2*(10^-9);

Vy3t =  2*(10^-9);

Vz3d =  0;

Vz3t =  4*(10^-9);

% Numerical integration

Potential = zeros(length(y4),length(z4),length(d));

   for i1 = 1:length(y4) 

      for j1 = 1:length(z4)  

          for k1 = 1:length(d)

          Potential(i1,j1,k1) = integral3(@(x1,y1,z1) UU(d(k1),x1,x4,y1,y4(j1),z1,z4(i1)),Vx3d,Vx3t,Vy3d,Vy3t,Vz3d,Vz3t) ;

          end

       end    

   end

[Jan]

@chayanon summueang: By the way, the code looks much nicer, if you replace the expensive power operation 1*(10^-9) by the fast constant 1e-9. In addition you can use the "{} Code" button instead of inserting a blank line after each line of code.

You forgot to mention the problem you have with this code.

[madhan ravi]

Btw no of elements of x4 y4 are not the same.