add_data_field_children: Add 'Interval' and 'Value' child elements to a given...

In pmml: Generate PMML for Various Models

Add 'Interval' and 'Value' child elements to a given DataField element in a given PMML file.

Description

Add 'Interval' and 'Value' child elements to a given DataField element in a given PMML file.

Usage

add_data_field_children(
  xml_model = NULL,
  field = NULL,
  intervals = NULL,
  values = NULL,
  namespace = "4_4",
  ...
)

Arguments

xml_model	The PMML model in a XML node format. If the model is a text file, it should be converted to an XML node, for example, using the file_to_xml_node function.
field	The field to which the attributes are to be added. This is used when the attributes are a vector of name-value pairs, intended for this one field.
intervals	The 'Interval' elements given as a list
values	The 'Value' elements given as a list.
namespace	The namespace of the PMML model. This is frequently also the PMML version of the model.
...	Further arguments passed to or from other methods.

Details

The PMML format allows a DataField element to have 'Interval' and 'Value' child elements which although useful, may not always be present in a PMML model. This function allows one to take an existing PMML file and add these elements to the DataFields.

The 'Interval' elements or the 'Value' elements can be typed in, but more conveniently created by using the helper functions 'make_intervals' and 'MakeValues'. This function can then add these extra information to the PMML.

Value

An object of class XMLNode as that defined by the XML package. This represents the top level, or root node, of the XML document and is of type PMML. It can be written to file with saveXML.

Author(s)

Tridivesh Jena

Examples

# Make a sample model:
fit <- lm(Sepal.Length ~ ., data = iris[, -5])
fit_pmml <- pmml(fit)

# The resulting model has data fields but with no 'Interval' or Value'
# elements. This object is already an xml node (not an external text
# file), so there is no need to convert it to an xml node object.

# Add an 'Interval' element node by typing it in
fit_pmml_2 <- add_data_field_children(fit_pmml,
  field = "Sepal.Length",
  intervals = list(newXMLNode("Interval",
    attrs = c(closure = "openClosed", rightMargin = 3)
  ))
)

# Use helper functions to create list of 'Interval' and 'Value'
# elements. We define the 3 Intervals as ,1]  (1,2)  and [2,
mi <- make_intervals(
  list("openClosed", "openOpen", "closedOpen"),
  list(NULL, 1, 2), list(1, 2, NULL)
)

# Define 3 values, none with a 'displayValue' attribute and 1 value
# defined as 'invalid'. The 2nd one is 'valid' by default.
mv <- make_values(
  list(1.1, 2.2, 3.3), list(NULL, NULL, NULL),
  list("valid", NULL, "invalid")
)

# As an example, apply these to the Sepal.Length field:
fit_pmml_3 <- add_data_field_children(fit_pmml, field = "Sepal.Length", intervals = mi, values = mv)

# Only defined 'Interval's:
fit_pmml_3 <- add_data_field_children(fit_pmml, field = "Sepal.Length", intervals = mi)

pmml documentation built on March 18, 2022, 5:49 p.m.