measure_single

Compute a measure.vars vector (indicating a single output column)
with variable_table attribute to pass to
<code><a href="https://rdatatable.gitlab.io/data.table/reference/melt.data.table.html">melt.data.table</a></code>.

User-friendly functions for extracting a data
table (row for each match, column for each group)
from non-tabular text data using regular expressions,
and for melting columns that match a regular expression.
Patterns are defined using a readable syntax
that makes it easy to build complex patterns
in terms of simpler, re-usable sub-patterns.
Named R arguments are translated to column names
in the output; capture groups without names are used
internally in order to provide a standard interface
to three regular expression 'C' libraries
('PCRE', 'RE2', 'ICU').
Output can also include numeric columns via
user-specified type conversion functions.

Toby Hocking

Named Capture to Data Tables

measure_single function

<dl> <dt>subject.names</dt>
<dd>character vector of data frame column names.</dd> <dt>match.dt</dt>
<dd>data table of matches.</dd> <dt>no.match</dt>
<dd>logical vector.</dd> <dt>value.name</dt>
<dd>string.</dd></dl>

Arguments

Toby Hocking &lt;toby.hocking@r-project.org&gt; [aut, cre]

Author

Compute a measure.vars vector (indicating a single output column)
with variable_table attribute to pass to
<code><a href='https://rdatatable.gitlab.io/data.table/reference/melt.data.table.html'>melt.data.table</a></code>.

measure single — measure_single

<dl>

 <dt>subject.names</dt>
<dd>character vector of data frame column names.</dd>

 <dt>match.dt</dt>
<dd>data table of matches.</dd>

 <dt>no.match</dt>
<dd>logical vector.</dd>

 <dt>value.name</dt>
<dd>string.</dd>

</dl>

measure_single: measure single

Description

Usage

Arguments

Author