It was previously split into the multiple packages qtl2geno, qtl2scan, qtl2plot, and qtl2db, but that proved awkward and confusing and so the packages have been combined. But also see the related package, qtl2convert, for converting data among the R/qtl2, DOQTL, and R/qtl formats. qtl2convert will remain a separate package.
Alternatively, you can install R/qtl2 from its source on GitHub. (But note that compiling the C++ code can be rather slow.)
On Windows, you'll need Rtools.
On Mac OS X, you'll need the command-line developer tools.
You then need to install the devtools package, plus a set of package dependencies: yaml, jsonlite, data.table, RcppEigen, RSQLite, and qtl. (Additional, secondary dependencies will also be installed.)
install.packages(c("devtools", "yaml", "jsonlite", "data.table", "RcppEigen", "RSQLite", "qtl"))
Finally, install R/qtl2 using
To cite R/qtl2 in publications, use:
Broman KW, Gatti DM, Simecek P, Furlotte NA, Prins P, Sen Ś, Yandell BS, Churchill GA (2018) R/qtl2: software for mapping quantitative trait loci with high-dimensional data and multi-parent populations. Genetics 211:495-502 doi:10.1534/genetics.118.301595
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