Hi, I am trying to draw a perpendicular line from a point to two points. Mathematically I know how to do it, but to program it, I encounter some problem and hope can get help. Thanks.
I have points, A, B and C. I calculate the slope and intercept for line drawn between A and B. I am trying to check whether I can draw a perpendicular line from C to line AB and get the x,y value for the point D at the intersection. Assume I get the slope of the perpendicular line, I will have my point (D) using variable x and y which is potentially on line AB. My idea was using |AC|*|AC| = |AD|*|AD|+ |CD|*|CD|. I don't know what function I may need to call to calculate the values for point D (uniroot?). Thank you. -- View this message in context: http://r.789695.n4.nabble.com/Draw-a-perpendicular-line-tp2335882p2335882.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
