fhir_melt_internal

This function handles the core melting operation for multiple entries in an indexed data.table.
It is used internally by <code>fhir_melt()</code> to separate multiple entries in a given set of columns
into individual rows.

Useful tools for conveniently downloading FHIR resources in xml format
and converting them to R data.frames. The package uses FHIR-search to download bundles
from a FHIR server, provides functions to save and read xml-files containing such bundles
and allows flattening the bundles to data.frames using XPath expressions. FHIR® is the registered trademark
of HL7 and is used with the permission of HL7. Use of the FHIR trademark does not constitute endorsement of this product by HL7.

Julia Palm

fhircrackr

Handling HL7 FHIR® Resources in R

Thomas Peschel

Jens Przybilla

Frank Meineke

fhir_melt_internal function

<dl><dt>indexed_dt</dt>
<dd>A data.table with indexed multiple entries.</dd>
<dt>columns</dt>
<dd>A character vector specifying the names of all columns that should be melted simultaneously.
It is advisable to only melt columns that belong to the same repeating attribute.</dd>
<dt>brackets</dt>
<dd>A character vector of length two, defining the brackets used for the indices.</dd>
<dt>sep</dt>
<dd>A character vector of length one, the separator that was used when pasting together multiple entries.</dd>
<dt>id_name</dt>
<dd>A character vector of length one, the name of the column that will hold the identification
of the origin of the new rows.</dd>
<dt>all_columns</dt>
<dd>A boolean indicating whether all columns should be returned (default is FALSE).</dd></dl>

Arguments

Internal function to melt multiple entries in a data.table — fhir_melt_internal

<dl>

<dt>indexed_dt</dt>
<dd>A data.table with indexed multiple entries.</dd>


<dt>columns</dt>
<dd>A character vector specifying the names of all columns that should be melted simultaneously.
It is advisable to only melt columns that belong to the same repeating attribute.</dd>


<dt>brackets</dt>
<dd>A character vector of length two, defining the brackets used for the indices.</dd>


<dt>sep</dt>
<dd>A character vector of length one, the separator that was used when pasting together multiple entries.</dd>


<dt>id_name</dt>
<dd>A character vector of length one, the name of the column that will hold the identification
of the origin of the new rows.</dd>


<dt>all_columns</dt>
<dd>A boolean indicating whether all columns should be returned (default is FALSE).</dd>

</dl>

fhir_melt_internal: Internal function to melt multiple entries in a data.table

Description

Usage

Value

Arguments

See Also