Give the Quadrant Number of Planar Points
Determine the quadrant of planar points, i.e. in which of the four parts cut by the x- and y- axis the points lie. Zero values (i.e. points on the axes) are treated as if positive.
quadrant(x, y=NULL)
x,y |
numeric vectors of the same length, or |
numeric vector of same length as x (if that's a vector) with
values in 1:4 indicating the quadrant number of the
corresponding point.
xy <- as.matrix(expand.grid(x= -7:7, y= -7:7)); rownames(xy) <- NULL (qu <- quadrant(xy)) plot(xy, col = qu+1, main = "quadrant() number", axes = FALSE) abline(h=0, v=0, col="gray") # the x- and y- axis text(xy, lab = qu, col = qu+1, adj = c(1.4,0))
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