Does the input have row names?

Does the input have row names?

Usage

hasRownames(x)

Arguments

x

Object.

Value

TRUE on success; FALSE on failure, with cause set.

Note

Updated 2022-12-14.

data.frame

Standard data.frame class objects cannot have NULL row names defined. Here we are checking to see if a data.frame has soft NULL row names, meaning that they return as a sequence that is identical to the number of rows.

Examples

## TRUE ====
x <- data.frame(
    "sample1" = c(1L, 2L),
    "sample2" = c(3L, 4L),
    row.names = c("gene1", "gene2")
)
print(x)
#>       sample1 sample2
#> gene1       1       3
#> gene2       2       4
hasRownames(x)
#> [1] TRUE

## FALSE ====
x <- data.frame(a = seq_len(2L))
print(x)
#>   a
#> 1 1
#> 2 2
# Standard data frame doesn't allow NULL row names.
rownames(x)
#> [1] "1" "2"
hasRownames(x)
#> [1] FALSE

x <- S4Vectors::DataFrame(a = seq_len(2L))
print(x)
#> DataFrame with 2 rows and 1 column
#>           a
#>   <integer>
#> 1         1
#> 2         2
# S4 data frame does allow NULL row names.
rownames(x)
#> NULL
hasRownames(x)
#> [1] FALSE