dtwPlotTwoWay: Plotting of dynamic time warp results: pointwise comparison

Description

Plot a DTW results for visual inspection.

Usage

dtwPlotTwoWay(d,xts=NULL,yts=NULL, offset=0,
			type="o",pch=21, 
			xlab="Index", ylab="Query value", 
			match.col="gray70",
			... )

Arguments

an alignment result, object of class dtw

xts

query vector

yts

template vector

xlab,ylab

axis labels

offset

displacement between the timeseries, summed to template

match.col

color of the match lines

type,pch

graphical parameters for timeseries plotting, passed to matplot

...

additional arguments, passed to matplot

Warning

These functions are incompatible with mechanisms for arranging plots on a device: par(mfrow), layout and split.screen.

concept

Dynamic Time Warp

Details

Display the query and template time series and their alignment, arranged so that alignment can be visually inspected.

The two vectors are displayed via the matplot functions, and their appearance can be customized via type and pch arguments (constants or vectors of two elements). If offset is set, the template is offset by the given amount; this will be reflected by the right-hand axis.

Only single-variate time series can be plotted this way.

Examples

Run this code

## A noisy sine wave as query
## A cosine is for template; sin and cos are offset by 25 samples

idx<-seq(0,6.28,len=100);
query<-sin(idx)+runif(100)/10;
template<-cos(idx)
dtw(query,template,step=asymmetricP1)->alignment;


## Equivalent to plot(alignment,xts=query,yts=template,type="two");
dtwPlotTwoWay(alignment,xts=query,yts=template);

## Beware of the template's y axis, may be confusing
plot(alignment,xts=query,yts=template,offset=-2,type="two");

legend("topright",c("Query","Template"), pch=21, col=1:6)

Run the code above in your browser using DataLab

Get 50% off unlimited learning