Created
December 31, 2015 09:12
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The code used for benchmarking
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library(stringr) | |
library(microbenchmark) | |
str<-c("3412123401234") | |
replength<-function(pat,s) { | |
length( gregexpr(pat,s)[[1]] ) | |
} | |
repeats<-function(s) { | |
r<-sapply( | |
unique( | |
regmatches( s, gregexpr("(\\d{2,})(?=.*\\1)", s, perl=T) )[[1]] | |
), | |
replength,s=s ) | |
pat<-names(r[r==max(r)][1]) | |
data.frame("Pattern"=pat,"Repeats"=unname(r[r==max(r)][1]),"Pat.length"=nchar(pat),stringsAsFactors=FALSE) | |
} | |
tensibai<-function(str) { | |
repeats(str) | |
} | |
make.matrix <- function(x,y) { | |
vl <- nchar(d) | |
OUT <- seq(x,nchar(y),1) | |
if(length(OUT) < vl) OUT <- c(OUT,rep(NA,vl-length(OUT))) | |
OUT | |
} | |
jimbou <- function(d) { | |
mm <- sapply(1:nchar(d), make.matrix, d) | |
mm2 <- sapply(2:nrow(mm), function(x,y) str_sub(string= y, start= mm[1,], end= mm[x,]), d) | |
counts <- sort(table(mm2),decreasing = T) | |
res <- data.frame("nlength"=sapply(names(counts),nchar),"counts"=counts) | |
res[res$counts>1,] | |
} | |
original <- function(string){ | |
out = c() | |
check.till = floor(nchar(string)/2) | |
for (start in 1:nchar(string)){ | |
for (end in 1:check.till){ | |
pat = substr(string,start,start+end) | |
repeats = length(gregexpr(pat,string)[[1]]) | |
length = nchar(pat) | |
if (length >= 2) out = rbind(out, c(pat, repeats, length)) | |
} | |
} | |
out = as.data.frame(out, stringsAsFactors = FALSE) | |
colnames(out) = c("Pattern","Repeats","Pat.Length") | |
out$Repeats = as.integer(out$Repeats) | |
out$Pat.Length = as.integer(out$Pat.Length) | |
out = out[out$Repeats > 1,] | |
out = out[order(out[,2],out[,3],decreasing = T),] | |
out = out[1,] | |
out[is.na(out)] = 0 | |
return(out) | |
} | |
microbenchmark(original(str),jimbou(str),tensibai(str),times=3) |
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