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missing.clj
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missing.clj
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(ns tablecloth.api.missing
(:require [tech.v3.dataset :as ds]
[tech.v3.dataset.math :as dm]
[tablecloth.api.utils :refer [column-names grouped? process-group-data]]
[tablecloth.api.columns :refer [select-columns]]))
(defn- select-or-drop-missing
"Select rows with missing values"
([f ds] (select-or-drop-missing f ds nil))
([f ds columns-selector]
(if (grouped? ds)
(process-group-data ds #(select-or-drop-missing f % columns-selector))
(let [ds- (if columns-selector
(select-columns ds columns-selector)
ds)]
(f ds (ds/missing ds-))))))
(defn- select-or-drop-missing-docstring
[op]
(str op " rows with missing values
`columns-selector` selects columns to look at missing values"))
(def ^{:doc (select-or-drop-missing-docstring "Select")
:arglists '([ds] [ds columns-selector])}
select-missing (partial select-or-drop-missing ds/select-rows))
(def ^{:doc (select-or-drop-missing-docstring "Drop")
:arglists '([ds] [ds columns-selector])}
drop-missing (partial select-or-drop-missing ds/drop-rows))
(defn replace-missing
([ds] (replace-missing ds :mid))
([ds strategy] (replace-missing ds :all strategy))
([ds columns-selector strategy] (replace-missing ds columns-selector strategy nil))
([ds columns-selector strategy value]
(if (grouped? ds)
(process-group-data ds #(replace-missing % columns-selector strategy value))
(let [cols (column-names ds columns-selector)]
(ds/replace-missing ds cols strategy value)))))
(defn fill-range-replace
([ds colname max-span] (fill-range-replace ds colname max-span :down))
([ds colname max-span missing-strategy] (fill-range-replace ds colname max-span missing-strategy nil))
([ds colname max-span missing-strategy missing-value]
(if (grouped? ds)
(process-group-data ds #(fill-range-replace % colname max-span missing-strategy missing-value))
(dm/fill-range-replace ds colname max-span missing-strategy missing-value))))