R Under development (unstable) (2023-11-16 r85542 ucrt) -- "Unsuffered Consequences"
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> library(qtl)
> data(hyper)
> 
> # write to tidy format
> write.cross(hyper, "tidy", "hyper_tidy")
> 
> # read back in
> x <- read.cross("tidy", "", genfile="hyper_tidy_gen.csv",
+                 mapfile="hyper_tidy_map.csv", phefile="hyper_tidy_phe.csv",
+                 genotypes=c("BB", "BA", "AA"))
 --Read the following data:
	 250  individuals
	 174  markers
	 2  phenotypes
 --Cross type: bc 
> 
> # compare results
> comparecrosses(x, hyper)
	Crosses are identical.
> 
> proc.time()
   user  system elapsed 
   0.23    0.10    0.32