hyperSpec (version 0.95)

stacked.offsets: y Offsets for Stacked Plots

Description

Calculate approriate yoffset values for stacking in plotspc.

Usage

stacked.offsets(x, stacked = TRUE, .spc = NULL)

Arguments

x

a hyperSpec object

stacked

TRUE to stack single spectra. A numeric or factor is interpreted as giving the grouping, a character is interpreted as the name of the extra data column of x that holds the grouping.

.spc

for internal use. If given, the ranges are evaluated on .spc. However, this may change in future.

Value

• a list containing
• offsets
  numeric with the yoffset for each group in stacked
• groups
  numeric with the group number for each spectrum

Details

Usually, the stacked argument of plotspc will do fine, but if you need fine control over the stacking, you may calculate the y offsets yourself.

See Also

plotspc

Examples

groups <- rep (1 : 3, length.out = nrow (chondro))
mean.pm.sd <- aggregate (chondro, groups, 
   function (x) mean (x) + c(-1, 1) * sd (x))

offset <- stacked.offsets (mean.pm.sd, ".aggregate")
plot (mean.pm.sd, fill.col = matlab.palette (3), fill = ".aggregate", stacked = ".aggregate")
 	
plot (aggregate (chondro, groups, mean), yoffset = offset$offsets,      lines.args = list (lty = 2, lwd = 2), add = TRUE)