fhircrackr (version 0.2.1)

fhir_common_columns: Find common columns

Description

This is a convenience function to find all column names in a data frame starting with the same string that can then be used for fhir_melt.

Usage

fhir_common_columns(data_frame, column_names_prefix)

Arguments

data_frame

A data frame with automatically named columns as produced by fhir_crack.

column_names_prefix

A string containing the common prefix of the desired columns.

Value

A character vector with the names of all columns matching column_names_prefix.

Details

It is intended for use on data frames with column names that have been automatically produced by fhir_crack and follow the form level1.level2.level3 such as name.given.value or code.coding.system.value. Note that this function will only work on column names following exactly this schema.

The resulting character vector can be used for melting all columns belonging to the same attribute in an indexed data frame, see ?fhir_melt.

Examples

# NOT RUN {
#unserialize example bundles
bundles <- fhir_unserialize(medication_bundles)

#crack Patient Resources
design <- list(
  Patients = list(".//Patient")
)

dfs <- fhir_crack(bundles, design)

#look at automatically generated names
names(dfs$Patients)

#extract all column names beginning with the string "name"
fhir_common_columns(data_frame = dfs$Patients, column_names_prefix = "name")
# }