### R code from vignette source 'vignettes/DECIPHER/inst/doc/ArtOfAlignmentInR.Rnw'

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### code chunk number 1: ArtOfAlignmentInR.Rnw:52-54
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options(continue=" ")
options(width=80)


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### code chunk number 2: expr0
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library(DECIPHER)
n_points <- 10
N0 <- ceiling(2^seq(5, 13, length.out=n_points))
N1 <- ceiling(2^seq(5, 12, length.out=n_points))
N2 <- ceiling(2^seq(5, 13, length.out=n_points))
N3 <- ceiling(2^seq(5, 16, length.out=n_points))
timings0 <- setNames(rep(0, length(N0)), N0)
timings1 <- setNames(rep(0, length(N1)), N1)
timings2 <- setNames(rep(0, length(N2)), N2)
timings3 <- setNames(rep(0, length(N3)), N3)
for (i in seq_len(length(N0))) {
	for (j in 0:3) {
		N <- eval(parse(text=paste("N", j, sep="")))
		# simulate sequences with 15% distance
		string1 <- DNAStringSet(paste(sample(DNA_ALPHABET[1:4], N[i], replace = TRUE), collapse = ""))
		string2 <- replaceAt(string1,
			at=IRanges(sample(N[i], ceiling(N[i]/5)), width=1),
			sample(c(DNA_ALPHABET[1:4], ""), ceiling(N[i]/5), replace = TRUE))
		# align the sequences using two methods
		if (j==0) {
			timings0[i] <- system.time(pairwiseAlignment(string1, string2))[["user.self"]]
		} else if (j==1) {
			timings1[i] <- system.time(AlignProfiles(string1, string2, restrict=-Inf, anchor=NA, processors=1))[["user.self"]]
		} else if (j==2) {
			timings2[i] <- system.time(AlignProfiles(string1, string2, anchor=NA, processors=1))[["user.self"]]
		} else { # j == 3
			timings3[i] <- system.time(AlignProfiles(string1, string2, processors=1))[["user.self"]]
		}
	}
}

c0 <- lm(timings0 ~ N0 + I(N0^2))
c1 <- lm(timings1 ~ N1 + I(N1^2))
c2 <- lm(timings2 ~ N2)
c3 <- lm(timings3 ~ N3)

N <- seq(1, 46340, length.out=1000) # prediction range
plot(N0, timings0,
	xlab = "Sequence length (nucleotides)",
	ylab = "Elapsed Time (sec.)",
	main = "",
	ylim=c(range(timings0, timings1, timings2, timings3)),
	xlim=c(0, max(N3)))
points(N, predict(c0,
		data.frame(N0 = N)),
	type="l", lty=3)
points(N1, timings1,
	col="blue", pch=0)
points(N, predict(c1,
		data.frame(N1 = N)),
	type="l", lty=3, col="blue")
points(N2, timings2,
	col="red", pch=5)
points(N, predict(c2,
		data.frame(N2 = N)),
	type="l", lty=3, col="red")
N <- seq(1, max(N3), length.out=1000) # prediction range
points(N3, timings3,
	col="green", pch=2)
points(N, predict(c3,
		data.frame(N3 = N)),
	type="l", lty=3, col="green")
legend("bottomright",
	c("Biostrings::pairwiseAlignment",
		"AlignProfiles (unrestricted, unanchored)",
		"AlignProfiles (restricted, unanchored)",
		"AlignProfiles (restricted, anchored)"),
	pch=c(1, 0, 5, 2), lty=3,
	col=c("black", "blue", "red", "green"), bg="white")


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### code chunk number 3: expr1
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library(DECIPHER)

# specify the path to your sequence file:
fas <- "<<path to FASTA file>>"
# OR find the example sequence file used in this tutorial:
fas <- system.file("extdata", "50S_ribosomal_protein_L2.fas", package="DECIPHER")

dna <- readDNAStringSet(fas)
dna # the unaligned sequences


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### code chunk number 4: expr2 (eval = FALSE)
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## AA <- AlignTranslation(dna, asAAStringSet=TRUE) # align the translation
## BrowseSequences(AA, highlight=1) # view the alignment
## 
## DNA <- AlignTranslation(dna) # align the translation then reverse translate
## DNA <- AlignSeqs(dna) # align the sequences directly without translation


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### code chunk number 5: expr3 (eval = FALSE)
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## # form guide tree using pairwiseAlignment
## l <- length(dna)
## d <- matrix(0, nrow=l, ncol=l)
## pBar <- txtProgressBar(style=3)
## for (j in 2:l) {
## 	d[j, 1:(j - 1)] <- pairwiseAlignment(rep(dna[j], j - 1),
## 		dna[1:(j - 1)],
## 		scoreOnly=TRUE)
## 	setTxtProgressBar(pBar, j/l)
## }
## close(pBar)
## 
## # rescale the distance scores from 0 to 1
## m <- max(d[lower.tri(d)])
## d[lower.tri(d)] <- d[lower.tri(d)] - m
## m <- min(d[lower.tri(d)])
## d[lower.tri(d)] <- d[lower.tri(d)]/m
## 
## # form a guide tree from the distance matrix
## gT <- IdClusters(d, cutoff=seq(0, 1, 0.001))
## 
## # use the guide tree as input for alignment
## DNA <- AlignSeqs(dna, guideTree=gT) # align directly
## DNA <- AlignTranslation(dna, guideTree=gT) # align by translation


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### code chunk number 6: expr4 (eval = FALSE)
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## # form guide tree using inexact clustering
## gT <- IdClusters(myXStringSet=dna, method="inexact", cutoff=seq(0.05, 0.9, 0.05))
## 
## # use the guide tree as input for alignment
## DNA <- AlignSeqs(dna, guideTree=gT) # align directly
## DNA <- AlignTranslation(dna, guideTree=gT) # align by translation


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### code chunk number 7: expr5 (eval = FALSE)
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## # form a chained guide tree
## gT <- data.frame(seq_along(dna))
## 
## # use the guide tree as input for alignment
## DNA <- AlignTranslation(dna, guideTree=gT) # align by translation


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### code chunk number 8: expr6 (eval = FALSE)
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## half <- floor(length(dna)/2)
## dna1 <- dna[1:half] # first half
## dna2 <- dna[(half + 1):length(dna)] # second half
## 
## AA1 <- AlignTranslation(dna1, asAAStringSet=TRUE)
## AA2 <- AlignTranslation(dna2, asAAStringSet=TRUE)
## AA <- AlignProfiles(AA1, AA2)


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### code chunk number 9: expr7 (eval = FALSE)
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## # Align DNA sequences stored in separate tables:
## dbConn <- dbConnect(SQLite(), ":memory:")
## Seqs2DB(AA1, "DNAStringSet", dbConn, "AA1", tblName="AA1")
## Seqs2DB(AA2, "DNAStringSet", dbConn, "AA2", tblName="AA2")
## AlignDB(dbConn, tblName=c("AA1", "AA2"), add2tbl="AA",
##         gapExtension=-5, gapOpening=-7, terminalGap=-5,
##         type="AAStringSet")
## AA <- SearchDB(dbConn, tblName="AA", type="AAStringSet")
## BrowseDB(dbConn, tblName="AA")
## dbDisconnect(dbConn)


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### code chunk number 10: sessinfo
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toLatex(sessionInfo(), locale=FALSE)