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R清洁CSV文件

2016-05-17 65 views
3

我正在研究天气数据。我试图清理一个csv文件，但不断收到奇怪的错误。在csv文件9999和-9999中为空值。我想删除其中一半以上的值为9999或-9999的所有列。我在csv文件中读取。然后初始化一个空矩阵，使其与在csv文件中读取时创建的数据框尺寸相同。我遍历数据框“文件”中的列，检查是否有任何na或空字符串的值。我创建了一个向量“meta”，并从plyr库调用count来聚合数据框中的所有列。然后我遍历行并检查是否有任何na值在行中，然后检查if 9999或-9999是否在向量元行中。然后我会查看频率是否大于列中行数的一半。如果是，则将这些值添加到干净的矩阵中。我不断收到奇怪的错误，而干净矩阵中的值并不是我所预期的。我会附上两个截图。我还会附上csv文件和R代码。R清洁CSV文件

感谢

errors values in the clean matrix 1

file <- read.csv(header = TRUE, file = "C:\\Users\\michael.guarino1\\Desktop\\weather\\nov_6_2012\\735144.csv") 
clean <- matrix(0, nrow(file), ncol(file))#initialize matrix of same dimensions as file 
library(plyr) 
count <- 1 #initialize count to 1 
for (i in 1:ncol(file)) { 
    if (!any(is.na(file[,i]))|!any(file[,i]==" ")) { 
    meta <- count(file, i) 
    for(row in 1:nrow(meta)){ 
    if(!is.na(meta[row,1])){ 
     if (meta[row,1]== -9999 | meta[row,1]== 9999) { 
     print("condition 1 found") 

     if (meta$freq < (nrow(file)/2)) { 
      print("condition 2 found") 
      clean[, count] <- file[, i] 

      count <- count + 1 
     } 
     } 
    } 

     #else{ 
     # clean[, count] <- file[, i] 
     #count <- count + 1 
    # } 
    } 

    } 
    else{ 
    next 
    } 
} 
print("meta") 
print(meta) 
print("clean") 
print(clean) 


    STATION,STATION_NAME,ELEVATION,LATITUDE,LONGITUDE,DATE,MDPR,Measurement Flag,Quality Flag,Source Flag,Time of Observation,MDSF,Measurement Flag,Quality Flag,Source Flag,Time of Observation,DAPR,Measurement Flag,Quality Flag,Source Flag,Time of Observation,DASF,Measurement Flag,Quality Flag,Source Flag,Time of Observation,PRCP,Measurement Flag,Quality Flag,Source Flag,Time of Observation,SNWD,Measurement Flag,Quality Flag,Source Flag,Time of Observation,SNOW,Measurement Flag,Quality Flag,Source Flag,Time of Observation,TMAX,Measurement Flag,Quality Flag,Source Flag,Time of Observation,TMIN,Measurement Flag,Quality Flag,Source Flag,Time of Observation,TOBS,Measurement Flag,Quality Flag,Source Flag,Time of Observation,PGTM,Measurement Flag,Quality Flag,Source Flag,Time of Observation,WT09,Measurement Flag,Quality Flag,Source Flag,Time of Observation,WT07,Measurement Flag,Quality Flag,Source Flag,Time of Observation,WT01,Measurement Flag,Quality Flag,Source Flag,Time of Observation,WT06,Measurement Flag,Quality Flag,Source Flag,Time of Observation,WT05,Measurement Flag,Quality Flag,Source Flag,Time of Observation,WT02,Measurement Flag,Quality Flag,Source Flag,Time of Observation,WT11,Measurement Flag,Quality Flag,Source Flag,Time of Observation,WT04,Measurement Flag,Quality Flag,Source Flag,Time of Observation,WT16,Measurement Flag,Quality Flag,Source Flag,Time of Observation,WT08,Measurement Flag,Quality Flag,Source Flag,Time of Observation,WT18,Measurement Flag,Quality Flag,Source Flag,Time of Observation,WT03,Measurement Flag,Quality Flag,Source Flag,Time of Observation 
GHCND:USR0000IPOB,POTTER BUTTE IDAHO ID US,1502.7,43.2261,-113.5744,20081104,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,40,H, ,U,9999,30,H, ,U,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999 
GHCND:USW00004842,WOOSTER WAYNE CO AIRPORT OH US,346.6,40.87306,-81.88667,20081104,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,0.00, , ,W,9999,-9999, , , ,9999,-9999, , , ,9999,71, , ,W,9999,40, , ,W,9999,-9999, , , ,9999,1605, , ,W,9999,-9999, , , ,9999,-9999, , , ,9999,1, , ,W,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,1, , ,W,9999,-9999, , , ,9999,-9999, , , ,9999 
GHCND:USW00003954,OKLAHOMA CITY WILEY POST AIRPORT OK US,395.3,35.53417,-97.64694,20081104,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,0.00, , ,W,9999,-9999, , , ,9999,-9999, , , ,9999,77, , ,W,9999,57, , ,W,9999,-9999, , , ,9999,1531, , ,W,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999 
GHCND:USC00080737,BIG CYPRESS FL US,4.6,26.32833,-80.99583,20081104,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,0.00, , ,0,0800,0.0,P, ,0,9999,0.0,P, ,0,9999,82, , ,0,0800,65, , ,0,0800,65, , ,0,0800,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999 
GHCND:USR0000OBRI,BRER RABBIT OREGON OR US,1798.3,44.3231,-119.7669,20081104,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,31,H, ,U,9999,22,H, ,U,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999 
GHCND:USC00202381,EAST JORDAN MI US,178.3,45.1519,-85.1322,20081104,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,0.00, , ,0,1500,0.0, , ,0,1500,0.0, , ,0,9999,74, , ,0,1500,43, , ,0,1500,74, , ,0,1500,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,1, , ,0,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999 
GHCND:USR0000CKON,KONOCTI CALIFORNIA CA US,659.3,38.9119,-122.7064,20081104,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,49,H, ,U,9999,40,H, ,U,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999 
GHCND:USR0000MBLA,BLACKWATER MARYLAND MD US,426.7,38.4167,-76,20081104,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,61,H, ,U,9999,54,H, ,U,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999 
GHCND:USR0000WEST,ESTERBROOK WYOMING WY US,1990.3,42.4153,-105.3611,20081104,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,56,H, ,U,9999,32,H, ,U,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999 
GHCND:US1GAGW0006,BUFORD 4.6 ESE GA US,352.7,34.0799,-83.9313,20081104,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,0.00, , ,N,9999,-9999, , , ,9999,0.0, , ,N,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999 
GHCND:USC00111290,CARLYLE RESERVOIR IL US,152.7,38.63083,-89.36583,20081104,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,0.00, , ,0,0800,0.0,P, ,0,9999,0.0,P, ,0,9999,76, , ,0,0800,46, , ,0,0800,49, , ,0,0800,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999 
GHCND:USC00116661,PAW PAW 2 S IL US,289.6,41.71222,-88.99889,20081104,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,0.00, , ,0,0700,0.0, , ,0,9999,0.0, , ,0,9999,72, , ,0,0700,47, , ,0,0700,48, , ,0,0700,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999 
GHCND:USR0000MSUN,SUNKHAZE MEADOWS MAINE ME US,34.7,44.9031,-68.64,20081104,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,63,H, ,U,9999,35,H, ,U,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999 
GHCND:USR0000MAVA,AVA MISSOURI MO US,399.6,36.9431,-92.65,20081104,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,73,H, ,U,9999,44,H, ,U,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999 
GHCND:USR0000JEBF,EB FORSYTHE NEW JERSEY NJ US,396.2,39.5,-74.5,20081104,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,60,H, ,U,9999,51,H, ,U,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999 
GHCND:USR0000ADVK,DEVILS KNOB ARKANSAS AR US,640.1,35.6111,-93.3333,20081104,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,65,H, ,U,9999,54,H, ,U,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999 
GHCND:USC00228556,SUMRALL MS US,88.4,31.42222,-89.53861,20081104,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,0.00,P, ,0,0700,0.0,P, ,0,9999,0.0,P, ,0,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999 
GHCND:USR0000TDAY,DAYTON TEXAS TX US,30.5,30.105,-94.9314,20081104,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,79,H, ,U,9999,48,H, ,U,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999 
GHCND:USC00340292,ARDMORE OK US,268.2,34.17139,-97.12944,20081104,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,0.00, , ,0,0800,0.0,P, ,0,9999,0.0,P, ,0,9999,78, , ,0,0800,60, , ,0,0800,67, , ,0,0800,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999 
GHCND:US1PALN0003,ADAMSTOWN 2.5 SSE PA US,198.1,40.2055,-76.0509,20081104,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,0.00,T, ,N,9999,-9999, , , ,9999,0.0, , ,N,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999 
GHCND:USC00408522,SPARTA WASTEWATER PLANT TN US,310.9,35.9566,-85.4813,20081104,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,0.00, , ,0,0700,0.0,P, ,0,9999,0.0,P, ,0,9999,75, , ,0,0700,36, , ,0,0700,39, , ,0,0700,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999 
GHCND:USR0000WGOL,GOLD MOUNTAIN WASHINGTON WA US,1428.3,48.1806,-118.4636,20081104,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,33,H, ,U,9999,27,H, ,U,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999 
GHCND:US1FLAL0007,GAINESVILLE 8.1 SW FL US,36.9,29.5908,-82.4314,20081104,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,0.00, , ,N,9999,-9999, , , ,9999,0.0, , ,N,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999 
GHCND:USC00148341,VALLEY FALLS KS US,299.3,39.3033,-95.4861,20081104,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,0.00, , ,0,0700,0.0,P, ,0,0700,0.0,P, ,0,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999 
GHCND:USR0000IHAR,HARDIN RIDGE INDIANA IN US,228.6,39,-86.4228,20081104,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,76,H, ,U,9999,43,H, ,U,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999 
GHCND:USW00014742,BURLINGTON INTERNATIONAL AIRPORT VT US,100.6,44.46806,-73.15028,20081104,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,0.00, , ,0,2400,0.0, , ,0,9999,0.0, , ,0,9999,61, , ,0,2400,46, , ,0,2400,-9999, , , ,9999,941, , ,W,9999,-9999, , , ,9999,-9999, , , ,9999,1, , ,W,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,1, , ,W,9999,-9999, , , ,9999,-9999, , , ,9999 
GHCND:USR0000SWIT,WITHERBEE SOUTH CAROLINA SC US,18,33.1597,-79.8306,20081104,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,62,H, ,U,9999,59,H, ,U,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999 
GHCND:USC00367782,SALINA 3 W PA US,338,40.5101,-79.5459,20081104,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,0.00, , ,0,0700,0.0,P, ,0,0700,0.0,P, ,0,9999,69, , ,0,0700,43, , ,0,0700,44, , ,0,0700,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999 
GHCND:USR0000CANZ,ANZA CALIFORNIA CA US,1194.8,33.555,-116.673,20081104,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,53,H, ,U,9999,42,H, ,U,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999 
GHCND:US1KSEL0043,HAYS 5.4 SSW KS US,630.6,38.8129,-99.3735,20081104,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,0.00, , ,N,9999,-9999, , , ,9999,0.0, , ,N,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999 
GHCND:USR0000ATAL,TALLADEGA ALABAMA AL US,182.9,33.4411,-86.0811,20081104,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,76,H, ,U,9999,44,H, ,U,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999 
GHCND:USW00094985,MARSHFIELD MUNICIPAL AIRPORT WI US,382.5,44.63806,-90.1875,20081104,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,0.00, , ,W,9999,-9999, , , ,9999,-9999, , , ,9999,73, , ,W,9999,53, , ,W,9999,-9999, , , ,9999,1436, , ,W,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999 
GHCND:USR0000ISLA,SLATE CREEK IDAHO ID US,477.9,45.6333,-116.2833,20081104,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,51,H, ,U,9999,41,H, ,U,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999 
GHCND:USR0000MDRY,DRY BLOOD CREEK MONTANA MT US,914.4,47.2442,-108.3575,20081104,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,53,H, ,U,9999,38,H, ,U,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999 
GHCND:USC00134142,IOWA FALLS IA US,321.6,42.5188,-93.2536,20081104,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,0.00,P, ,0,0700,0.0,P, ,0,9999,0.0,P, ,0,9999,75, , ,0,0700,52, , ,0,0700,55, , ,0,0700,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999 
GHCND:USC00161565,CARVILLE 2 SW LA US,7.6,30.19806,-91.12556,20081104,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,0.00, , ,0,2400,0.0,P, ,0,9999,0.0,P, ,0,9999,77, , ,0,2400,51, , ,0,2400,58, , ,0,2400,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999 
GHCND:USR0000NSTO,STONYKILL NEW YORK NY US,61,41.5,-73.9,20081104,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,63,H, ,U,9999,40,H, ,U,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999 
GHCND:US1ALMD0040,HAMPTON COVE 0.5 NNW AL US,187.1,34.667,-86.485,20081104,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,0.00, , ,N,9999,-9999, , , ,9999,0.0, , ,N,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999 
GHCND:USC00421446,CITY CRK WATER PLANT UT US,1624.6,40.8397,-111.8313,20081104,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,0.62, , ,0,1600,1.0, , ,0,1600,1.3, , ,0,9999,52, , ,0,1600,32, , ,0,1600,40, , ,0,1600,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999,-9999, , , ,9999

来源

2016-05-17 Michael Guarino

+1

警告：** **从来没有使用你的代码进行数据文件的绝对路径，它使代码完全不能再生（在其他机器上，或者如果你改变了文件的位置，你甚至可以自己做）。相反，请按逻辑分组您的项目的数据并使用相对路径。 –

+0

我不明白你为什么这么懒。 'apply（file，2，function（x）{sum（abs（x）== 9999）}）'将计算每列中9999和-9999的数量。然后只是其中该值超过行数的一半的子集列。它是一个双线... – Spacedman

+0

您的代码无法工作。你可以'count < - 1'然后尝试使用'count'就像一个函数：'meta < - count（file，i）'。那应该做什么？ – Spacedman

回答

-1

这样的事情应该有所帮助。

count9999 <- function(x) { 
    r1 <- sum(x == 9999)/length(x) 
    r2 <- sum(x == -9999)/length(x) 
    if (r1 > 0.5 | r2 > 0.5) { 
     return(FALSE) 
    } else { 
     return(TRUE) 
    } 
} 

file <- file[, apply(file, 2, count9999)]

来源

2016-05-17 15:30:41 sachinv

+0

这将删除所有你不需要的列 – sachinv

2

假设你的数据是这样的：

df <- data.frame(v1 = c(1,1,2,1,2,1), 
       v2 = c(9999, 1, 2, 1, 2, -9999), 
       v3 = c(9999, 1, -9999, 9999, 2, -9999))

你就可以删除已经超过其是9999或者-9999与colSums值的一半的列：

df[ , colSums(abs(df) == 9999)/nrow(df) < 0.5]

或与colMeans：

df[ , colMeans(abs(df) == 9999) < 0.5]

这两个结果在去除v3 -column：

v1 v2 
1 1 9999 
2 1  1 
3 2  2 
4 1  1 
5 2  2 
6 1 -9999

来源

2016-05-17 15:52:46 Jaap

0 
# Some made up data... 

A<-as.integer(runif(10,1,40)) 
B<-as.integer(runif(10,1,40)) 
C<-as.integer(runif(10,1,40)) 
D<-as.integer(runif(10,1,40)) 
E<-as.integer(runif(10,1,40)) 
rlist<-data.frame(A,B,C,D,E) 
rlist$A[rlist$A %% 2 == 0]=9999 
rlist$C[rlist$C %% 2 == 0]= -9999 
rlist$E[rlist$E %% 2 == 0]=9999 

print(rlist) 

#Now make "-9999" and "9999" into NA's 

rlist[rlist[,]==9999|rlist[,]==-9999]<-NA 

print(rlist) 

#Now we need a function to figure out if >50% of a list is NA 
is.most.NA<-function(x){ 
    mean(is.na(x))<=.5 
    } 

#Now apply the function to the columns 

rlist[,apply(rlist,2,is.most.NA)]

来源

2016-05-17 16:11:34 SeldomSeenSlim

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