Pivot an ir object from wide to long

Pivot an ir object from wide to long

Usage

pivot_wider.ir(
  data,
  id_cols = NULL,
  names_from = "name",
  names_prefix = "",
  names_sep = "_",
  names_glue = NULL,
  names_sort = FALSE,
  names_repair = "check_unique",
  values_from = "value",
  values_fill = NULL,
  values_fn = NULL,
  ...
)

Source

tidyr::pivot_wider()

Arguments

data

An object of class ir.

id_cols

<tidy-select> A set of columns that uniquely identify each observation. Typically used when you have redundant variables, i.e. variables whose values are perfectly correlated with existing variables.

Defaults to all columns in data except for the columns specified through names_from and values_from. If a tidyselect expression is supplied, it will be evaluated on data after removing the columns specified through names_from and values_from.

names_from, values_from

<tidy-select> A pair of arguments describing which column (or columns) to get the name of the output column (names_from), and which column (or columns) to get the cell values from (values_from).

If values_from contains multiple values, the value will be added to the front of the output column.

names_prefix

String added to the start of every variable name. This is particularly useful if names_from is a numeric vector and you want to create syntactic variable names.

names_sep

If names_from or values_from contains multiple variables, this will be used to join their values together into a single string to use as a column name.

names_glue

Instead of names_sep and names_prefix, you can supply a glue specification that uses the names_from columns (and special .value) to create custom column names.

names_sort

Should the column names be sorted? If FALSE, the default, column names are ordered by first appearance.

names_repair

What happens if the output has invalid column names? The default, "check_unique" is to error if the columns are duplicated. Use "minimal" to allow duplicates in the output, or "unique" to de-duplicated by adding numeric suffixes. See vctrs::vec_as_names() for more options.

values_fill

Optionally, a (scalar) value that specifies what each value should be filled in with when missing.

This can be a named list if you want to apply different fill values to different value columns.

values_fn

Optionally, a function applied to the value in each cell in the output. You will typically use this when the combination of id_cols and names_from columns does not uniquely identify an observation.

This can be a named list if you want to apply different aggregations to different values_from columns.

...

Additional arguments passed on to methods.

Value

data in a wide format. If the spectra column is dropped or invalidated (see ir_new_ir()), the ir class is dropped, else the object is of class ir.

See also

Other tidyverse: arrange.ir(), distinct.ir(), extract.ir(), filter-joins, filter.ir(), group_by, mutate, mutate-joins, nest, pivot_longer.ir(), rename, rowwise.ir(), select.ir(), separate.ir(), separate_rows.ir(), slice, summarize, unite.ir()

Examples

## pivot_wider
ir_sample_data |>
  tidyr::pivot_longer(
    cols = dplyr::any_of(c("holocellulose", "klason_lignin"))
  ) |>
  tidyr::pivot_wider(names_from = "name", values_from = "value")
#> # A tibble: 58 × 7
#>    id_measurement id_sample sample_type sample_comment    spectra  holocellulose
#>             <int> <chr>     <chr>       <chr>             <named >           [1]
#>  1              1 GN 11-389 needles     Abies Firma Momi… <tibble>         0.308
#>  2              2 GN 11-400 needles     Cupressocyparis … <tibble>         0.250
#>  3              3 GN 11-407 needles     Juniperus chinen… <tibble>         0.336
#>  4              4 GN 11-411 needles     Metasequoia glyp… <tibble>         0.184
#>  5              5 GN 11-416 needles     Pinus strobus To… <tibble>         0.309
#>  6              6 GN 11-419 needles     Pseudolarix amab… <tibble>         0.335
#>  7              7 GN 11-422 needles     Sequoia sempervi… <tibble>         0.241
#>  8              8 GN 11-423 needles     Taxodium distich… <tibble>         0.125
#>  9              9 GN 11-428 needles     Thuja occidental… <tibble>         0.252
#> 10             10 GN 11-434 needles     Tsuga carolinian… <tibble>         0.349
#> # ℹ 48 more rows
#> # ℹ 1 more variable: klason_lignin [1]