Count the number of elements of a given matrix z=z(x,y) that fall within successive pairs of breaks in x and y.
binCount2D(x, y, xbreaks, ybreaks, flatten = FALSE, include.lowest = FALSE)A list with the following elements: the breaks (xbreaks
and ybreaks), the midpoints (xmids and ymids)
between those breaks, and
the count (number) of f values in the boxes defined
between successive breaks.
vectors of numerical values.
vector of values of x and y
at the boundaries between the 2D bins, calculated using
pretty() on each of x and y, if not supplied.
A logical value indicating whether
the return value also contains equilength
vectors x, y, z and n, a flattened
representation of xmids, ymids, result and
number.
logical value indicating whether to include
points where x equals xbreaks[1] or y equals ybreaks[1].
Dan Kelley
By default, the sub-intervals defined by xbreaks and ybreaks
are open on the left/bottom and closed on the right/top, to match
the behaviour of cut(). An open interval does not include
points on the boundary, and so any x and y values that equal
xbreaks[1] or ybreaks[1] will not be counted. To include
such points in the calculation, set include.lowest to TRUE.
Other bin-related functions:
binApply1D(),
binApply2D(),
binAverage(),
binCount1D(),
binMean1D(),
binMean2D()