Plotting of dynamic time warp results
Methods for plotting dynamic time warp alignment objects returned
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label for the query axis
label for the reference axis
general style for the alignment plot
type of line to be drawn, used as the
show per-step average cost instead of cumulative cost
additional arguments, passed to plotting functions
dtwPlot displays alignment contained in
Various plotting styles are available, passing strings to the
type argument (may be abbreviated):
alignmentplots the warping curve in
twowayplots a point-by-point comparison, with matching lines
threewayvis-a-vis inspection of the timeseries and their warping curve
densitydisplays the cumulative cost landscape with the warping path overimposed
For two-way plotting, see documentation for function
For three-way plotting, see documentation for function
TRUE, the average cost per step
is plotted instead of the cumulative one. Step averaging depends on
Additional parameters are carried on to the plotting functions: use with care.
These functions are incompatible with mechanisms for
arranging plots on a device:
The density plot is more colorful than useful.
dtwPlotTwoWay for details on two-way plotting function.
dtwPlotThreeWay for details on three-way plotting function.
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## Same example as in dtw idx<-seq(0,6.28,len=100); query<-sin(idx)+runif(100)/10; reference<-cos(idx) alignment<-dtw(query,reference,keep=TRUE); ## A profile of the cumulative distance matrix ## Contour plot of the global cost dtwPlotDensity(alignment, main="Sine/cosine: symmetric alignment, no constraints") ###### ## ## 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 dtw(query,reference,keep=TRUE,step=typeIIIc)->ita; dtwPlot(ita,type="density", 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; dtwPlot(ita,type="density", main="Symmetric step with Itakura parallelogram window")
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