stream (version 2.0-1)

get_points: Get Points from a Data Stream Generator

Description

Gets points from a DSD object.

Usage

get_points(x, ...)
# S3 method for DSD
get_points(x, n = 1L, info = TRUE, ...)
remove_info(points)

Value

Returns a data.frame with (up to) n rows and as many columns as x produces.

Arguments

x

A DSD object.

...

Additional parameters to pass to the get_points() implementations.

n

integer; request up to n points from the stream. n = -1 returns all remaining points from limited streams.

info

return additional columns with information about the data point (e.g., a known cluster assignment).

points

a data.frame with points.

Author

Michael Hahsler

Details

Each DSD object has a unique way for creating/returning data points, but they all are called through the generic function, get_points(). This is done by using the S3 class system. See the man page for the specific DSD class on the semantics for each implementation of get_points().

Additional Point Information

Additional point information (e.g., known cluster/class assignment, noise status) can be requested with info = TRUE. This information is returned as additional columns. The column names start with . and are ignored by DST implementations. remove_info() is a convenience function to remove the information columns. Examples are

• .id for point IDs

• .class for known cluster/class labels used for plotting and evaluation

• .time a time stamp for the point (can be in seconds or an index for ordering)

Resetting a Stream

Many streams can be reset using reset_stream().

See Also

Other DSD: DSD_BarsAndGaussians(), DSD_Benchmark(), DSD_Cubes(), DSD_Gaussians(), DSD_MG(), DSD_Memory(), DSD_Mixture(), DSD_NULL(), DSD_ReadDB(), DSD_ReadStream(), DSD_Target(), DSD_UniformNoise(), DSD_mlbenchData(), DSD_mlbenchGenerator(), DSD(), DSF(), animate_data(), close_stream(), plot.DSD(), reset_stream()

Examples

stream <- DSD_Gaussians()
points <- get_points(stream, n = 5)
points

remove_info(points)