fhir_cast: Cast table with multiple entries This function divides...

In fhircrackr: Handling HL7 FHIR® Resources in R

Cast table with multiple entries This function divides multiple entries in a compact indexed table as produced by fhir_crack() into separate columns.

Description

This function turns a table from compact format into wide format. Every column containing multiple entries will be turned into multiple columns. The number of columns created from a single column in the original table is determined by the maximum number of multiple entries occurring in this column. Rows with less than the maximally occurring number of entries will be filled with NA values.

Usage

fhir_cast(indexed_df, brackets, sep, verbose = 1)

Arguments

indexed_df	A compact data.frame/data.table with indexed multiple entries. Column names should reflect the XPath expression of the respective element.
brackets	A character vector of length two, defining the brackets used for the indices.
sep	A character vector of length one defining the separator that was used when pasting together multiple entries in fhir_crack().
verbose	An integer vector of length one. If 0, nothing is printed, if 1, only general progress is printed, if > 1, progress for each variable is printed. Defaults to 1.

Details

For fhir_cast() to work properly, column names of the input data must reflect the Xpath to the corresponding resource element with . as a separator, e.g. code.coding.system. These names are produced automatically by fhir_crack() when the names are not explicitly set in the cols element of the fhir_table_description()/fhir_design().

In the names of the newly created columns the indices will be added in front of the column names, similar to the result of fhir_crack() with format="wide". See examples and the corresponding package vignette for a more detailed description.

See Also

fhir_crack(), fhir_melt(), fhir_build_bundle()

Examples

#unserialize example
bundles <- fhir_unserialize(bundles = example_bundles1)

#crack fhir resources
table_desc <- fhir_table_description(
    resource = "Patient",
    brackets = c('[', ']'),
    sep      = " ",
    keep_attr=TRUE
)
df <- fhir_crack(bundles = bundles, design = table_desc)

#original df
df

#cast
fhir_cast(df, brackets=c('[', ']'), sep = ' ', verbose = 0)

fhircrackr documentation built on Feb. 16, 2023, 8:33 p.m.