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Check if an argument is a data table

Source: R/checkDataTable.R
checkDataTable.Rd

Check if an argument is a data table

Usage

checkDataTable(
  x,
  key = NULL,
  index = NULL,
  types = character(0L),
  any.missing = TRUE,
  all.missing = TRUE,
  min.rows = NULL,
  max.rows = NULL,
  min.cols = NULL,
  max.cols = NULL,
  nrows = NULL,
  ncols = NULL,
  row.names = NULL,
  col.names = NULL,
  null.ok = FALSE
)

check_data_table(
  x,
  key = NULL,
  index = NULL,
  types = character(0L),
  any.missing = TRUE,
  all.missing = TRUE,
  min.rows = NULL,
  max.rows = NULL,
  min.cols = NULL,
  max.cols = NULL,
  nrows = NULL,
  ncols = NULL,
  row.names = NULL,
  col.names = NULL,
  null.ok = FALSE
)

assertDataTable(
  x,
  key = NULL,
  index = NULL,
  types = character(0L),
  any.missing = TRUE,
  all.missing = TRUE,
  min.rows = NULL,
  max.rows = NULL,
  min.cols = NULL,
  max.cols = NULL,
  nrows = NULL,
  ncols = NULL,
  row.names = NULL,
  col.names = NULL,
  null.ok = FALSE,
  .var.name = vname(x),
  add = NULL
)

assert_data_table(
  x,
  key = NULL,
  index = NULL,
  types = character(0L),
  any.missing = TRUE,
  all.missing = TRUE,
  min.rows = NULL,
  max.rows = NULL,
  min.cols = NULL,
  max.cols = NULL,
  nrows = NULL,
  ncols = NULL,
  row.names = NULL,
  col.names = NULL,
  null.ok = FALSE,
  .var.name = vname(x),
  add = NULL
)

testDataTable(
  x,
  key = NULL,
  index = NULL,
  types = character(0L),
  any.missing = TRUE,
  all.missing = TRUE,
  min.rows = NULL,
  max.rows = NULL,
  min.cols = NULL,
  max.cols = NULL,
  nrows = NULL,
  ncols = NULL,
  row.names = NULL,
  col.names = NULL,
  null.ok = FALSE
)

test_data_table(
  x,
  key = NULL,
  index = NULL,
  types = character(0L),
  any.missing = TRUE,
  all.missing = TRUE,
  min.rows = NULL,
  max.rows = NULL,
  min.cols = NULL,
  max.cols = NULL,
  nrows = NULL,
  ncols = NULL,
  row.names = NULL,
  col.names = NULL,
  null.ok = FALSE
)

expect_data_table(
  x,
  key = NULL,
  index = NULL,
  types = character(0L),
  any.missing = TRUE,
  all.missing = TRUE,
  min.rows = NULL,
  max.rows = NULL,
  min.cols = NULL,
  max.cols = NULL,
  nrows = NULL,
  ncols = NULL,
  row.names = NULL,
  col.names = NULL,
  null.ok = FALSE,
  info = NULL,
  label = vname(x)
)

Arguments

x

[any]
Object to check.

key

[character]
Expected primary key(s) of the data table.

index

[character]
Expected secondary key(s) of the data table.

types

[character]
Character vector of class names. Each list element must inherit from at least one of the provided types. The types “logical”, “integer”, “integerish”, “double”, “numeric”, “complex”, “character”, “factor”, “atomic”, “vector” “atomicvector”, “array”, “matrix”, “list”, “function”, “environment” and “null” are supported. For other types inherits is used as a fallback to check x's inheritance. Defaults to character(0) (no check).

any.missing

[logical(1)]
Are missing values allowed? Default is TRUE.

all.missing

[logical(1)]
Are matrices with only missing values allowed? Default is TRUE.

min.rows

[integer(1)]
Minimum number of rows.

max.rows

[integer(1)]
Maximum number of rows.

min.cols

[integer(1)]
Minimum number of columns.

max.cols

[integer(1)]
Maximum number of columns.

nrows

[integer(1)]
Exact number of rows.

ncols

[integer(1)]
Exact number of columns.

row.names

[character(1)]
Check for row names. Default is “NULL” (no check). See checkNamed for possible values. Note that you can use checkSubset to check for a specific set of names.

col.names

[character(1)]
Check for column names. Default is “NULL” (no check). See checkNamed for possible values. Note that you can use checkSubset to test for a specific set of names.

null.ok

[logical(1)]
If set to TRUE, x may also be NULL. In this case only a type check of x is performed, all additional checks are disabled.

.var.name

[character(1)]
Name of the checked object to print in assertions. Defaults to the heuristic implemented in vname.

add

[AssertCollection]
Collection to store assertion messages. See AssertCollection.

info

[character(1)]
Extra information to be included in the message for the testthat reporter. See expect_that.

label

[character(1)]
Name of the checked object to print in messages. Defaults to the heuristic implemented in vname.

Value

Depending on the function prefix: If the check is successful, the functions assertDataTable/assert_data_table return x invisibly, whereas checkDataTable/check_data_table and testDataTable/test_data_table return TRUE. If the check is not successful, assertDataTable/assert_data_table throws an error message, testDataTable/test_data_table returns FALSE, and checkDataTable/check_data_table return a string with the error message. The function expect_data_table always returns an expectation.

See also

Other compound: checkArray(), checkDataFrame(), checkMatrix(), checkTibble()

Examples

library(data.table)
dt = as.data.table(iris)
setkeyv(dt, "Species")
setkeyv(dt, "Sepal.Length", physical = FALSE)
testDataTable(dt)
#> [1] TRUE
testDataTable(dt, key = "Species", index = "Sepal.Length", any.missing = FALSE)
#> [1] TRUE