drop_nullmarkers: Drop markers with no genotype data
In rqtl/qtl2geno: Treatment of Marker Genotypes for QTL Experiments

Description Usage Arguments Details Value See Also Examples

Drop markers with no genotype data (or no informative genotypes)

1	drop_nullmarkers(cross, quiet = FALSE)

`cross`	Object of class `"cross2"`. For details, see the R/qtl2 developer guide.
`quiet`	If FALSE, print information about how many markers were dropped.

We omit any markers that have completely missing data, or if founder genotypes are present (e.g., for Diversity Outbreds), the founder genotypes are missing or are all the same.

The input cross with the uninformative markers removed.

drop_markers(), pull_markers()

grav2 <- read_cross2(system.file("extdata", "grav2.zip", package="qtl2geno"))
# make a couple of markers missing
grav2$geno[[2]][,c(3,25)] <- 0
grav2_rev <- drop_nullmarkers(grav2)