Colinear Points

[Terje Vallestad]

(12-25-2013 06:13 PM)debrouxl Wrote:  You can also use the (x3 - x1) * (y2 - y1) + (y3 - y1) * (x1 - x2) formula for computing collinearity without det() or even a matrix. 4 subtractions, 2 multiplications and 1 addition make this formula highly suitable to implementation on embedded platforms.

(just looked up the definition again on the Internet, I seldom use it and never remember it )

Thanks Debroux,

To me this was more about writing my first PPL programme rather than the maths. Given the speed of the Prime and the relative ease of entering a matrix I thought using a matrix was quite a quick way of entering the required input?

That said, how would you go about the programme using the formula? Using INPUT? I'm certainly here to learn.

Cheers, Terje