- #1

minger

Science Advisor

- 1,495

- 2

Code:

```
x0 = 0.0
y0 = 0.0
dx = x - x0
dy = y - y0
radius = sqrt(dx*dx + dy*dy)
theta = atan(dy/dx)
theta = theta + dtheta
x = radius*cos(theta)
y = radius*sin(theta)
```

My idea was to just write a function for the gridpoints as a function of time alone. I won't be able to store any additional information, such as original or previous position. I had an idea of some sort of phase angle, and I think that would require that.

Also, I cannot simply find the velocity, and then calculate the displacement, and therefore new position, because apparently there are numerical problems and the grid could start to "walk" away from each other.

Hopefully I've explained this well enough, I appreciate any help.