Get sample metadata
Examples
tst = example_PlinkMatrix()
head(getSampleData(tst))
#> FID IID PID MID Sex Phenotype
#> 1 0 HG00096 0 0 1 -9
#> 2 0 HG00097 0 0 2 -9
#> 3 0 HG00099 0 0 2 -9
#> 4 0 HG00100 0 0 2 -9
#> 5 0 HG00101 0 0 1 -9
#> 6 0 HG00102 0 0 2 -9