R Under development (unstable) (2023-11-16 r85542 ucrt) -- "Unsuffered Consequences"
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> # test input/output in mapqtl format
> 
> library(qtl)
> data(fake.4way)
> 
> write.cross(fake.4way, "mapqtl", "fake_4way_mapqtl")
> 
> x <- read.cross("mapqtl", "", genfile="fake_4way_mapqtl.loc",
+                 phefile="fake_4way_mapqtl.qua",
+                 mapfile="fake_4way_mapqtl_female.map")
 --Read the following data:
	Number of individuals:  250 
	Number of markers:  157 
	Number of phenotypes:  2 
 --Cross type: 4way 
> 
> x <- replace.map(x, pull.map(fake.4way))
> 
> comparecrosses(x, fake.4way)
	Crosses are identical.
> 
> proc.time()
   user  system elapsed 
   1.65    0.14    1.78