R: Determine the number of QTL in a QTL object

nqtl {qtl} | R Documentation

## Determine the number of QTL in a QTL object

### Description

Determine the number of QTL in a QTL object.

### Usage

    nqtl(qtl)

### Arguments

`qtl` | An object of class `qtl`. See `makeqtl` for details.

### Value

The number of QTL in the input QTL object.

### Author(s)

Karl W Broman, broman@wisc.edu

### See Also

`makeqtl`, `fitqtl`, `dropfromqtl`, `replaceqtl`, `addtoqtl`, `summary.qtl`, `reorderqtl`

### Examples

    data(fake.f2)

    # take out several QTLs and make QTL object
    qc <- c("1", "6", "13")
    qp <- c(25.8, 33.6, 18.63)
    fake.f2 <- subset(fake.f2, chr=qc)

    fake.f2 <- calc.genoprob(fake.f2, step=2, err=0)
    qtl <- makeqtl(fake.f2, qc, qp, what="prob")

    nqtl(qtl)

[Package qtl version 1.46-2 Index]