# dtwPlotDensity

0th

Percentile

##### Display the cumulative cost density with the warping path overimposed

The plot is based on the cumulative cost matrix. It displays the optimal alignment as a "ridge" in the global cost landscape.

##### Usage
dtwPlotDensity(d, normalize = FALSE, xlab = "Query index",
ylab = "Reference index", ...)
##### Arguments
d

an alignment result, object of class dtw

normalize

show per-step average cost instead of cumulative cost

xlab

label for the query axis

ylab

label for the reference axis

...

additional parameters forwarded to plotting functions

##### Details

The alignment must have been constructed with the keep.internals=TRUE parameter set.

If normalize is TRUE, the average cost per step is plotted instead of the cumulative one. Step averaging depends on the stepPattern() used.

Other plot: dtwPlotThreeWay, dtwPlotTwoWay, dtwPlot

##### Aliases
• dtwPlotDensity
##### Examples
# NOT RUN {
## A study of the "Itakura" parallelogram
##
## A widely held misconception is that the "Itakura parallelogram" (as
## described in the original article) is a global constraint.  Instead,
## it arises from local slope restrictions. Anyway, an "itakuraWindow",
## is provided in this package. A comparison between the two follows.

## The local constraint: three sides of the parallelogram are seen
idx<-seq(0,6.28,len=100);
query<-sin(idx)+runif(100)/10;
reference<-cos(idx)

ita <- dtw(query,reference,keep=TRUE,step=typeIIIc)
dtwPlotDensity(ita, main="Slope-limited asymmetric step (Itakura)")

## Symmetric step with global parallelogram-shaped constraint. Note how
## long (>2 steps) horizontal stretches are allowed within the window.

dtw(query,reference,keep=TRUE,window=itakuraWindow)->ita;
dtwPlotDensity(ita,
main="Symmetric step with Itakura parallelogram window")

# }

Documentation reproduced from package dtw, version 1.21-3, License: GPL (>= 2)

### Community examples

Looks like there are no examples yet.