count_by256

Uses raw vectors to minimize memory consumption of categorical
variables with fewer than 256 unique values. Useful for analysis of large
datasets involving variables such as age, years, states, countries, or
education levels.

Hugh Parsonage

factor256

Use Raw Vectors to Minimize Memory Consumption of Factors

count_by256 function

<dl><dt>DT</dt>
<dd>A <code>data.table</code>.</dd>
<dt>by</dt>
<dd>(string) A column of <code>DT</code>, the count of which is desired.</dd>
<dt>count_col</dt>
<dd>(string) The name of the column in the result containing
the counts.</dd></dl>

Arguments

Aggregating helpers — count_by256

<dl>

<dt>DT</dt>
<dd>A <code>data.table</code>.</dd>


<dt>by</dt>
<dd>(string) A column of <code>DT</code>, the count of which is desired.</dd>


<dt>count_col</dt>
<dd>(string) The name of the column in the result containing
the counts.</dd>

</dl>

count_by256: Aggregating helpers

Description

Usage

Value

Arguments