tablecloth.api.columns — scicloj/tablecloth 6.031

->array clj

(->array ds colname)

(->array ds colname datatype)

Convert numerical column(s) to java array

add-column clj

(add-column ds column-name column)

(add-column ds column-name column size-strategy)

Add or update (modify) column under column-name.

column can be sequence of values or generator function (which gets ds as input).

• ds - a dataset
• column-name - if it's existing column name, column will be replaced
• column - can be column (from other dataset), sequence, single value or function. Too big columns are always trimmed. Too small are cycled or extended with missing values (according to size-strategy argument)
• size-strategy (optional) - when new column is shorter than dataset row count, following strategies are applied:
  • :cycle - repeat data
  • :na - append missing values
  • :strict - (default) throws an exception when sizes mismatch

add-columns clj

(add-columns ds columns-map)

(add-columns ds columns-map size-strategy)

Add or updade (modify) columns defined in columns-map (mapping: name -> column)

add-or-replace-column clj deprecated

(add-or-replace-column ds column-name column)

(add-or-replace-column ds column-name column size-strategy)

add-or-replace-columns clj deprecated

(add-or-replace-columns ds columns-map)

(add-or-replace-columns ds columns-map size-strategy)

convert-types clj

(convert-types ds coltype-map-or-columns-selector)

(convert-types ds columns-selector new-types)

Convert type of the column to the other type.

drop-columns clj

(drop-columns ds)

(drop-columns ds columns-selector)

(drop-columns ds columns-selector meta-field)

Drop columns by (returns dataset):

• name
• sequence of names
• map of names with new names (rename)
• function which filter names (via column metadata)

map-columns clj

(map-columns ds column-name map-fn)

(map-columns ds column-name columns-selector map-fn)

(map-columns ds column-name new-type columns-selector map-fn)

rename-columns clj

(rename-columns ds columns-mapping)

(rename-columns ds columns-selector columns-map-fn)

Rename columns with provided old -> new name map

reorder-columns clj

(reorder-columns ds columns-selector & columns-selectors)

Reorder columns using column selector(s). When column names are incomplete, the missing will be attached at the end.

select-columns clj

(select-columns ds)

(select-columns ds columns-selector)

(select-columns ds columns-selector meta-field)

Select columns by (returns dataset):

• name
• sequence of names
• map of names with new names (rename)
• function which filter names (via column metadata)

update-columns clj

(update-columns ds columns-map)

(update-columns ds columns-selector update-functions)