hexTapply {hexbin} | R Documentation |
A wrapper for tapply except that it operates with each hexagon bin being the category. The function operates on the data associated on the points from each bin.
hexTapply(hbin, dat, FUN = sum, ..., simplify=TRUE)
hbin |
a object of class "hexbin" , typically produced by
hexbin(*) . |
dat |
A vector of data the same length as hbin@cID |
FUN |
the function to be applied. In the case of functions like
+ , %*% , etc., the function name must be quoted. If
FUN is NULL , tapply returns a vector which can be used
to subscript the multi-way array tapply normally produces. |
... |
optional arguments to FUN . |
simplify |
If FALSE , tapply always returns an array
of mode "list" . If TRUE (the default), then if
FUN always returns a scalar, tapply returns an array
with the mode of the scalar. |
This function is a wrapper for tapply, except that the cell id is always the categorical variable. This function is specifically good for adding variables to the cAtt slot of a hexbin object or for plotting a third variable in a hexagon plot. See below for examples.
Returns a vector of the result of 'FUN' as in
tapply
. See tapply
for detailed
description of output.
Nicholas Lewin-Koh
data(NHANES) hbin<-hexbin(log(NHANES$Diet.Iron+1),log(NHANES$BMI),xbins=25,IDs=TRUE) hvp<-plot(hbin) mtrans<-hexTapply(hbin,NHANES$Transferin,median,na.rm=TRUE) pushHexport(hvp$plot.vp) grid.hexagons(hbin,style='lattice',pen=0,border='red',use.count=FALSE, cell.at=mtrans)