How to plot3 using 3 equations

[KALYAN ACHARJYA]

you can do that easily using plot3(X, Y, Z) here , implement Ei(x) first

[ANKUR KUMAR]

Please attach you codes and possible files (if any).

[KALYAN ACHARJYA]

It your code and you are not sure whether correct or not?

How do you know, it is not true?

Answer 1

[Torsten]

r0=10.0;
z0=1.0;
a=0.1;
nu=1.0;
Gamm_inf=1000;
t=0:0.05:10;
z=z0*exp(2*a*t);
r=r0*exp(-a*t);
w=a*r.^2/(2*nu)
w0=a*r0^2/(2*nu);
theta=-Gamm_inf/(8*pi*nu)*((1./w.*(1-exp(-w))-1/w0*(1-exp(-w0)))-expint(w)-expint(w0));
[x y]=pol2cart(theta,r);
plot3(x,y,z)