數值列順序字符矩陣

我與矩陣的工作從包含數字和字符的CSV讀入。這是一個較小的矩陣，但基本上什麼我的工作：數值列順序字符矩陣

[,1] [,2] [,3]   [,4] [,5] [,6] [,7] [,8] [,9] 
V2 "A" "1" "Sample X1" "34712" "39390" "38858" "38574" "38660" 
V3 "A" "2" "Sample X2" "35333" "39940" "40533" "39936" "40669" 
V4 "A" "3" "Sample X3" "33612" "39601" "38658" "39220" "39465" 
V5 "A" "4" "Sample X4" "34309" "39200" "38597" "39820" "40081" 
V6 "A" "5" "Sample X5" "33637" "39404" "40497" "39388" "40033" 
V7 "A" "6" "Sample X6" "35314" "39522" "40345" "38624" "40306" 
V8 "A" "7" "Sample X7" "35548" "39000" "41408" "38310" "39849" 
V9 "A" "8" "Sample X8" "33972" "39930" "39777" "39582" "39570" 
V10 "A" "9" "Sample X9" "34808" "39857" "39252" "39248" "38465" 
V11 "A" "10" "Sample X10" "34316" "39798" "39776" "39516" "38812" 
V12 "A" "11" "Sample X11" "34476" "38581" "39672" "38997" "38794" 
V13 "A" "12" "Sample X12" "36246" "38809" "37872" "38100" "36925" 
V14 "B" "1" "Sample X13" "33642" "40201" "40202" "39320" "40426" 
V15 "B" "2" "Sample X14" "33381" "40624" "40349" "41350" "40490" 
V16 "B" "3" "Sample X15" "34465" "42096" "41194" "40613" "40416" 
V17 "B" "4" "Sample X16" "33957" "41905" "42273" "40710" "40681" 
V18 "B" "5" "Sample X17" "33877" "42040" "42226" "40788" "41261" 
V19 "B" "6" "Sample X18" "33970" "41860" "41149" "41093" "40877" 
V20 "B" "7" "Sample X19" "34745" "42040" "40186" "40862" "41044" 
V21 "B" "8" "Sample X20" "34140" "41274" "39880" "40356" "40496" 
V22 "B" "9" "Sample X21" "33929" "40652" "41410" "40760" "40718" 
V23 "B" "10" "Sample X22" "33684" "39220" "40478" "41500" "40094" 
V24 "B" "11" "Sample X23" "33141" "41446" "41121" "40726" "41020" 
V25 "B" "12" "Sample X24" "33405" "38481" "37716" "38562" "38218" 
V26 "C" "1" "Sample X25" "71560" "86402" "85614" "84273" "83264" 
V27 "C" "2" "Sample X26" "72144" "86266" "88082" "87672" "87356" 
V28 "C" "3" "Sample X27" "71946" "90201" "89156" "88386" "88006" 
V29 "C" "4" "Sample X28" "71758" "89108" "88225" "86006" "88654" 
V30 "C" "5" "Sample X29" "71144" "86558" "88614" "87028" "88809" 
V31 "C" "6" "Sample X30" "70504" "89230" "88869" "86653" "86356" 
V32 "C" "7" "Sample X31" "67874" "88405" "84878" "84914" "85425" 
V33 "C" "8" "Sample X32" "70273" "87865" "87529" "87945" "86172"

我想沒有標題排序的第二列的矩陣如此這般：

A 1 . . . 
B 1 
C 1 
A 2 
B 2 
C 2 
A 3 
. 
. 
. 
A 12 
B 12 
C 12 . . .

我環顧四周並且發現，你可以使用命令：

data <- data[order(data[,2],]

但它出來是這樣的：

A 1 . . . 
B 1 
c 1 
A 10 
B 10 
C 10 
A 11 
B 11 
C 11 
A 12 
B 12 
C 12 
A 2 
B 2 
C 2 
. 
. 
. 
A 9 
B 9 
C 9 . . .

是不是因爲這個矩陣是一個字符矩陣？我如何才能做出僅第二列數字，所以我可以根據它進行分類？

感謝

來源

2015-01-13 Ilya L.

具有呈矩陣數據是一個壞主意，當你想擁有類的混合物（例如數字和字符）跨列。相反，你應該使用數據框。

理想情況下，讀出的數據到一個數據幀與read.csv或read.table。否則，強制您的矩陣與as.data.frame的數據框。

鑑於矩陣m（你的情況data）：

d <- as.data.frame(m, stringsAsFactors=FALSE) 
d[, 3] <- as.numeric(d[, 3]) # coerce the relevant column to numeric 
d[order(d[, 3]), ]

請注意，您能以便根據需要與m[order(as.numeric(m[, 3])), ]，但由此產生的列仍然都將character矩陣。

注意：對您所看到的排序行爲的解釋是，對於字符向量，任何以1（例如10）開頭的內容都會出現在2之前。

來源

2015-01-13 02:39:51 jbaums

感謝關於data.frame的提示，我很困惑如何獲取多個類的數據。無論如何改變它的排序方式嗎？成爲1,2,3,4，...，10,11,12。或者最好的辦法就是將這些行刪除並放到最後？ –

@IlyaLederman不確定你的意思。我提供的代碼（d < - as.data.frame（數據）; d [順序（d [1,3]），]'），或'數據[順序（as.numeric（數據[1,3]））， ]'，都應該按照你的意願訂購。 – jbaums

我仍然得到1,10,11,12,2,3,4,5,9,7,8,9的訂單。我做了lapply（數據，課），它說一切都是一個因素。我真的不明白什麼是因素。我在CSV讀象數據<-t（read.csv（「data.csv」，首標= FALSE，則跳過= 5））[ - 1，] 然後執行數據< - as.data.frame（數據） –

數值列順序字符矩陣

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