Topic: field line

How to draw a field line, ie, a line defined by its tangent at every point? I can compute the tangent slope at any point (x, y).

Re: field line

If you want a vector field like the following, then I am afraid Graph cannot do that:
http://upload.wikimedia.org/wikipedia/commons/thumb/b/b9/VectorField.svg/200px-VectorField.svg.png

Re: field line

thank you!