get.segs {plotrix} | R Documentation |
Calculates midpoints and limits for a list or data frame for use with centipede.plot.
get.segs(x,midpoint="mean",lower.limit="std.error",upper.limit="std.error")
x |
a list or data frame. |
midpoint |
The name of the function to calculate midpoints. |
lower.limit,upper.limit |
The names of the function to calculate lower and upper limits. |
get.segs
calls the functions whose names are passed to calculate
midpoints and limits for each list element or data frame column.
A matrix with four rows and as many columns as were in the object
x
. The first row contains the midpoint values, the second and third
the lower and upper limit values respectively and the fourth row the number
of valid observations in the columns.
Jim Lemon