dtwPlotDensity | R Documentation |
The plot is based on the cumulative cost matrix. It displays the optimal alignment as a "ridge" in the global cost landscape.
dtwPlotDensity( d, normalize = FALSE, xlab = "Query index", ylab = "Reference index", ... )
d |
an alignment result, object of class |
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 |
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()
## 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")
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