R: Drop markers without any genotype data

drop.nullmarkers {qtl} | R Documentation

## Drop markers without any genotype data

### Description

Drop markers, from the data matrices and genetic maps, that have no genotype data.

### Usage

    drop.nullmarkers(cross)

### Arguments

`cross` | An object of class `cross`. See `read.cross` for details.

### Value

The input object, with any markers lacking genotype data removed from the genotype data matrices, genetic maps, and, if applicable, any derived data (such as produced by `calc.genoprob`). (It might be a good idea to re-derive such things after using this function.)

### Author(s)

Karl W Broman, broman@wisc.edu

### See Also

`nullmarkers`, `drop.markers`, `clean.cross`, `geno.table`

### Examples

    # removes one marker from hyper
    data(hyper)
    hyper <- drop.nullmarkers(hyper)

    # shouldn't do anything to listeria
    data(listeria)
    listeria <- drop.nullmarkers(listeria)

[Package qtl version 1.46-2 Index]