RConnection

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API Reference for EPL (ApamaDoc) 10.15.1.2

SUMMARY: IMPORT | CONSTANT | MEMBER | ACTION

DETAIL: IMPORT | CONSTANT | MEMBER | ACTION

com.apama.r
Event RConnection

Utilities for interacting with R and Rserve.

Since:: 10.1

Action summary
`void`	`close()` Close the R connection.
`any`	`evaluate(string value)` Evaluate a string as some R script returning an any type. The return type is generic, the client must process the return type. The type would depend on what R returned (i.e. could be multi-dimensional matrix).
`boolean`	`evaluateAsBoolean(string value)` Evaluate a string as some R script returning a boolean. The return type is boolean if the object returned by R is of boolean type, otherwise it will throw CastException.
`float`	`evaluateAsFloat(string value)` Evaluate a string as some R script returning a float. The return type is float if the object returned by R is of float type, otherwise it will throw CastException.
`sequence<float>`	`evaluateAsFloatSequence(string value)` Evaluate a string as some R script returning a sequence of floats. The return type is sequence of floats if the object returned by R is of float array type, otherwise it will throw CastException.
`integer`	`evaluateAsInteger(string value)` Evaluate a string as some R script returning an integer. The return type is integer if the object returned by R is of integer type, otherwise it will throw CastException.
`sequence<integer>`	`evaluateAsIntegerSequence(string value)` Evaluate a string as some R script returning a sequence of integers. The return type is sequence of integers if the object returned by R is of integer array type, otherwise it will throw CastException.
`string`	`evaluateAsString(string value)` Evaluate a string as some R script returning a string. The return type is string if the object returned by R is of string type, otherwise it will throw CastException.
`void`	`evaluateVoid(string value)` Evaluate a string as some R script.
`void`	`set(string name, any value)` Set an R value.

Action detail

close

void close()

Close the R connection.

evaluate

any evaluate(string value)

Evaluate a string as some R script returning an any type. The return type is generic, the client must process the return type. The type would depend on what R returned (i.e. could be multi-dimensional matrix).

Parameters:: value - The string value to be evaluated.

Returns:: Returns any object which end user has to handle

evaluateAsBoolean

boolean evaluateAsBoolean(string value)

Evaluate a string as some R script returning a boolean. The return type is boolean if the object returned by R is of boolean type, otherwise it will throw CastException.

Parameters:: value - The string value to be evaluated.

Returns:: Result of evaluation as a boolean.

evaluateAsFloat

float evaluateAsFloat(string value)

Evaluate a string as some R script returning a float. The return type is float if the object returned by R is of float type, otherwise it will throw CastException.

Parameters:: value - The string value to be evaluated.

Returns:: Result of evaluation as a float.

evaluateAsFloatSequence

sequence<float> evaluateAsFloatSequence(string value)

Evaluate a string as some R script returning a sequence of floats. The return type is sequence of floats if the object returned by R is of float array type, otherwise it will throw CastException.

Parameters:: value - The string value to be evaluated.

Returns:: Result of evaluation as a sequence of floats.

evaluateAsInteger

integer evaluateAsInteger(string value)

Evaluate a string as some R script returning an integer. The return type is integer if the object returned by R is of integer type, otherwise it will throw CastException.

Parameters:: value - The string value to be evaluated.

Returns:: Result of evaluation as a integer.

evaluateAsIntegerSequence

sequence<integer> evaluateAsIntegerSequence(string value)

Evaluate a string as some R script returning a sequence of integers. The return type is sequence of integers if the object returned by R is of integer array type, otherwise it will throw CastException.

Parameters:: value - The string value to be evaluated.

Returns:: Result of evaluation as a sequence of integers.

evaluateAsString

string evaluateAsString(string value)

Evaluate a string as some R script returning a string. The return type is string if the object returned by R is of string type, otherwise it will throw CastException.

Parameters:: value - The string value to be evaluated.

Returns:: Result of evaluation as a string.

evaluateVoid

void evaluateVoid(string value)

Evaluate a string as some R script.

Parameters:: value - The string value to be evaluated.

set

void set(string name, any value)

Set an R value.

The value type can be most EPL types. An exception is thown if the type is not supported.

Parameters:: name - Name of the R variable to set; value - The value to set name to.