On Sat, 13 Oct 2007, marius schebella wrote:
I haven't heard it before, but tried to translate it from german (steigungswinkel) any line that is defined by f(x)=ax+b and where a!=0
That's called "linear" or "affine" equation.
In one terminology, "linear" is the general case, and "linear homogeneous" when b=0.
In another terminology, "affine" is the general case, and "linear" is when b=0.
But that's probably not all that you want to support: you want also to support f(x)=b and the non-function case of a vertical line. The thing is, functions of 1 variable to 1 variable are all that they teach people in high-school, but if you want to compute things in which y and x are considered of equal importance and not hierarchised, you have to stop considering one as the function of the other. You could, for example, use plain equations (not functions) for things that don't move, and consider y,x to be functions of t for things that move.
However, I don't remember anything about MSD, so I can't help you with that.
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