qtl (version 1.66)

shiftmap: Shift starting points in genetic maps

Description

Shift starting points in a genetic map to a set of defined positions

Usage

shiftmap(object, offset=0)

Value

If the input is a map object, a map object is returned; if the input is a cross object, a cross object is returned. In either case, the positions of markers are shifted so that the starting positions are as in offset.

Arguments

object

An object of class cross (see read.cross for details) or map (see sim.map for details).

offset

Defines the starting position for each chromosome. This should be a single value (to be used for all chromosomes) or a vector with length equal to the number of chromosomes, defining individual starting positions for each chromosome. For a sex-specific map (as in a 4-way cross), we use the same offset for both the male and female maps.

Author

Karl W Broman,

See Also

replace.map, est.map

Examples

data(hyper)
shiftedhyper <- shiftmap(hyper, offset=0)
par(mfrow=c(1,2))
plotMap(hyper, shift=FALSE, alternate.chrid=TRUE)
plotMap(shiftedhyper, shift=FALSE, alternate.chrid=TRUE)