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  • R2-14 2阶段3

    lucyylx 发布于:2018.03.30

    任务一:

    library(RMySQL)

    killDbConnections <- function () {

      all_cons <- dbListConnections(MySQL())

      print(all_cons)

      for(con in all_cons)

        +  dbDisconnect(con)

      print(paste(length(all_cons), " connections killed."))

    }

    killDbConnections()

    con <- dbConnect(MySQL(),host="localhost",dbname="rdb2",user="root",password="")

    dbSendQuery(con,'SET NAMES utf8')

    rs <- dbSendQuery(con, "SELECT * FROM article WHERE isdone=1")

    words = data.frame(word=c(), freq = c())

    while (!dbHasCompleted(rs)) {

    +     chunk<-dbFetch(rs,10)

    +     count<-nrow(chunk)

    +     cnt=1

    +     while (cnt<=count) {

    +         str=gsub("[[:punct:]]", "", tolower(chunk[cnt,5]))

    +         temp=as.vector(unlist(strsplit(str, split = " ")))

    +         temp_len=length(temp)

    +         cnt2=1

    +         while (cnt2 <= temp_len) {

    +             if(temp[cnt2] %in% words$word){words[words$word == temp[cnt2],]$freq = words[words$word == temp[cnt2],]$freq+1}

    +             else{words = rbind(words,data.frame(word=c(temp[cnt2]),freq=c(1)))}

    +             cnt2=cnt2+1

    +         }

    +         cnt=cnt+1

    +     }

    + }

    head(words)

    1_pic.jpg


    任务二:

    library(wordcloud2)

    wordcloud2(words[0:1000,])

     2_pic.jpg


    任务三:

    new_words = words[order(words$freq,decreasing=T),]

    del_word = c('of','the','and','in','to','a','that','is','for','buy','with','we','are','an','this','these','as','from','which','at','their','have','or','our','its','but','how','be','as','here','on','can','into','data','between','both','also','by')

    words2 = words[which(!(words$word %in% del_word)),]

    words2 = words2[order(words2$freq,decreasing=T),]

    wordcloud2(words2)

    3_1.jpg



     

     

     
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