Check SNP no position

Identifies SNPs without a usable genomic position, i.e. whose position is missing (`NA`), blank, non-numeric, or zero. The `Position` column may be numeric or character (`getGeno()` reads maps as character), so it is coerced to numeric first.

check.snp.no.position(snpmap)

Arguments

snpmap

Data frame with columns `Position` and `Name`.

Value

Character vector with SNP names without position. Returns `NULL` if none.

Examples

df <- data.frame(Position = c(0, 100, NA), Name = c("SNP1", "SNP2", "SNP3"))
check.snp.no.position(df)  # SNP1 (zero) and SNP3 (missing)
#> [1] "SNP1" "SNP3"