rectint | R Documentation |
Calculates the area of intersection of rectangles, specified by position
vectors x
and y
.
rectint(x, y)
x , y |
both vectors of length 4, or both matrices with 4 columns. |
Rectangles are specified as position vectors, that is c(x[1],x[2])
is the lower left corner, x[3]
and x[4]
are width and height
of the rectangle. When x
and y
are matrices, each row is
assumed to be a position vector specifying a rectangle.
Returns a scalar if x
and y
are vectors. If x
is
a n-by-4
and y
a m-by-4
matrix, then it returns
a n-by-m
matrix R
with entry (i,j)
being the area
rectint(x[i,], y[j,])
.
polyarea
x <- c(0.5, 0.5, 0.25, 1.00)
y <- c(0.3, 0.3, 0.35, 0.75)
rectint(x, y)
# [1] 0.0825
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