dtw_test.Rout.save
``````
R version 3.0.2 (2013-09-25) -- "Frisbee Sailing"
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> suppressPackageStartupMessages(library(dtw));
>
> ### Synthetic example: check indexes, distance, cost matrix
> ldist<-matrix(1,nrow=6,ncol=6);  # Matrix of ones
> ldist[2,]<-0; ldist[,5]<-0;      # Mark a clear path of zeroes
> ldist[2,5]<-.01;		 # Forcely cut the corner
>
> ds<-dtw(ldist,keep=T);		 # DTW with user-supplied local cost matrix
> ds\$distance			 # 2
[1] 2
> ds\$index1			 # 1 2 2 2 2 3 4 5 6 6
[1] 1 2 2 2 3 4 5 6 6
> ds\$index2			 # 1 1 2 3 4 5 5 5 5 6
[1] 1 2 3 4 5 5 5 5 6
> ds\$costMatrix
[,1] [,2] [,3] [,4] [,5] [,6]
[1,]    1    2    3    4 4.00 5.00
[2,]    1    1    1    1 1.01 1.01
[3,]    2    2    2    2 1.00 2.00
[4,]    3    3    3    3 1.00 2.00
[5,]    4    4    4    4 1.00 2.00
[6,]    5    5    5    5 1.00 2.00
>
> da<-dtw(ldist,step=asymmetric);	 # Also compute the asymmetric
> da\$distance			 # 2
[1] 2
> da\$index1			 # 1 2 3 4 5 6
[1] 1 2 3 4 5 6
> da\$index2			 # 1 3 5 5 5 6
[1] 1 3 5 5 5 6
>
> da<-dtw(ldist,step=asymmetricP0);	 # The strange aP0 alignment
> da\$distance			 # 1
[1] 1
> da\$index1			 # 1 2 2 2 2 3 4 5 6 6
[1] 1 2 2 2 2 3 4 5 6 6
> da\$index2			 # 1 1 2 3 4 5 5 5 5 6
[1] 1 1 2 3 4 5 5 5 5 6
>
> ### Count paths
> stopifnot(countPaths(ds)==1683)
>
> ### Native vs non-native
> ds<- dtw:::globalCostMatrix(ldist)
> dsn<- dtw:::globalCostMatrix(ldist,native=FALSE)
Warning message:
In dtw:::globalCostMatrix(ldist, native = FALSE) :
Native dtw implementation not available: using (slow) interpreted fallback
> stopifnot(all.equal(ds,dsn))		 # TRUE
>
>
> ###  Sine/cosine example: verify native output
> ### there may be a random chance of failing due to rounding errors
> idx<-seq(0,6.28,len=100);
> query<-sin(idx)+runif(100)/10;
> template<-cos(idx)
> ldist<-outer(query,template,FUN=function(x,y){(x-y)^2})
> ds<- dtw:::globalCostMatrix(ldist)
> dsn<- dtw:::globalCostMatrix(ldist,native=FALSE)
Warning message:
In dtw:::globalCostMatrix(ldist, native = FALSE) :
Native dtw implementation not available: using (slow) interpreted fallback
> all.equal(ds,dsn)		# TRUE
[1] TRUE
>
>
> ### Open begin-end matching
> query <- 2:3 + 0.01
> ref <- 1:4
> obe <- dtw(query,ref,open.begin=T,open.end=T,step=asymmetric)
> all.equal(obe\$distance,0.02)    # TRUE
[1] TRUE
> all.equal(obe\$index2,c(2,3))    # TRUE
[1] TRUE
>
>
> ### Use proxy::dist
> query <- cbind(1:10,1)
> ref <- cbind(11:15,2)
> cxdist <- proxy::dist(query,ref,method="Manhattan")
> d1 <- dtw(query,ref,dist.method="Manhattan")\$distance
> d2 <- dtw(cxdist)\$distance
> stopifnot(d1==d2)
>
>
> ### See if DTW is registered in proxy::dist
> lambda <- dist(query,ref,method="DTW")
> stopifnot(sum(lambda)==470)
>
>
> proc.time()
user  system elapsed
1.456   0.015   1.473
``````