tech.ml.dataset.column — techascent/tech.ml.dataset 1.0-alpha2

cache clj

(cache col)

Return the cache map for this column. Cache maps are never duplcated or copied.

clone clj

(clone col)

Clone this column not changing anything.

column-name clj

(column-name col)

column-values clj

(column-values col)

Return a 'thing convertible to a sequence' of values for this column. May be a java array or something else. Likely to error on missing.

correlation clj

(correlation lhs rhs correlation-type)

Correlation coefficient for given 2 columns. Available correlation types are: :pearson :spearman :kendall

Returns floating point number between [-1 1]

empty-column clj

(empty-column col datatype elem-count & [metadata])

Return a new column of this supertype where all values are missing.

get-column-value clj

(get-column-value col idx)

Get a value fro mthe column. Error on missing values.

is-column? clj

(is-column? item)

Return true if this item is a column.

is-missing? clj

(is-missing? col idx)

Return true if this index is missing.

merge-cache clj

(merge-cache col cache-map)

Merge the existing cache with new cache map. Cache maps are never duplicated or copied.

merge-metadata clj

(merge-metadata col data-map)

Merge metadata in column with this map. Beware this could change the name of the column.

metadata clj

(metadata col)

Return the metadata map for this column. Metadata must contain :name :datatype :size. Categorical columns must have :categorical? true and the inference target should have :target? true.

missing clj

(missing col)

Indexes of missing values

new-column clj

(new-column col datatype elem-count-or-values & [metadata])

Return a new column of this supertype with these values

select clj

(select col idx-seq)

Return a new column with the subset of indexes

set-cache clj

(set-cache col cache-map)

Set the cache on the column returning a new column. Cache maps are never duplicated or copied.

set-metadata clj

(set-metadata col data-map)

Set the metadata on the column returning a new column. Beware this could change the name.

set-name clj

(set-name col name)

Return a new column.

set-values clj

(set-values col idx-val-seq)

Set values in the column returning a new column with same name and datatype. Values which cannot be simply coerced to the datatype are an error.

stats clj

(stats col stats-set)

Return a map of stats. Stats set is a set of the desired stats in keyword form. Guaranteed support across implementations for :mean :variance :median :skew. Implementations should check their metadata before doing calculations.

supported-stats clj

(supported-stats col)

List of available stats for the column

to-double-array clj

(to-double-array col & [error-on-missing?])

Convert to a java primitive array of a given datatype. For strings, an implicit string->double mapping is expected. For booleans, true=1 false=0. Finally, any missing values should be indicated by a NaN of the expected type.

unique clj

(unique col)

Set of all unique values