Description Usage Arguments Details Warning Note Author(s) See Also Examples
Methods for plotting dynamic time warp alignment objects returned
by dtw
.
1 2 3 4 5 6 7 8 9 10 11 |
x,d |
|
xlab |
label for the query axis |
ylab |
label for the reference axis |
type |
general style for the alignment plot |
plot.type |
type of line to be drawn, used as the |
normalize |
show per-step average cost instead of cumulative cost |
... |
additional arguments, passed to plotting functions |
dtwPlot
displays alignment contained in dtw
objects.
Various plotting styles are available, passing strings to the
type
argument (may be abbreviated):
alignment
plots the warping curve in d
twoway
plots a point-by-point comparison, with matching lines
threeway
vis-a-vis inspection of the
timeseries and their warping curve
density
displays the cumulative cost landscape with the
warping path overimposed
For two-way plotting, see documentation for function
dtwPlotTwoWay
.
For three-way plotting, see documentation for function
dtwPlotThreeWay
.
If normalize
is TRUE
, the average cost per step
is plotted instead of the cumulative one. Step averaging depends on
the stepPattern
used.
Additional parameters are carried on to the plotting functions: use with care.
These functions are incompatible with mechanisms for
arranging plots on a device: par(mfrow)
, layout
and
split.screen
.
The density plot is more colorful than useful.
Toni Giorgino
dtwPlotTwoWay
for details on two-way plotting function.
dtwPlotThreeWay
for details on three-way plotting function.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 | ## 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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