是否有使用單元前綴

Question

的R函數格式編號是否有利用標準單元的前綴A R函數（或任何封裝）允許格式編號（整數）（千，兆等...），所以

10 -> 10 
100 -> 1K 
0.01 - > 10m 

etc ... 我可以自己做，但我寧願不要重新發明輪子。

Answer 1

require(sitools) 
f2si(80000) 
[1] "80 k" 
f2si(8E12) 
[1] "8 T" 

這似乎是很簡單的，因爲它附加兩個空格，如果不使用SI前綴：

f2si(80) 
[1] "80 " 

功能是便於修改，包括四捨五入。我還用附加空格解決了這個問題。

f2si2<-function (number,rounding=F) 
{ 
    lut <- c(1e-24, 1e-21, 1e-18, 1e-15, 1e-12, 1e-09, 1e-06, 
     0.001, 1, 1000, 1e+06, 1e+09, 1e+12, 1e+15, 1e+18, 1e+21, 
     1e+24) 
    pre <- c("y", "z", "a", "f", "p", "n", "u", "m", "", "k", 
     "M", "G", "T", "P", "E", "Z", "Y") 
    ix <- findInterval(number, lut) 
    if (lut[ix]!=1) { 
     if (rounding==T) { 
     sistring <- paste(round(number/lut[ix]), pre[ix]) 
     } 
     else { 
     sistring <- paste(number/lut[ix], pre[ix]) 
     } 
    } 
    else { 
     sistring <- as.character(number) 
    } 
    return(sistring) 
} 

f2si2(12345) 
[1] "12.345 k" 
f2si2(12345,T) 
[1] "12 k" 

Answer 2

我來到這裏的同一個問題。感謝羅蘭的回答;我建立在他的代碼有一些變化：

• 允許指定顯著數字四捨五入= FALSE（默認爲6就像「signif」內建函數）時
• 不會引發與值的誤差下面1E-24
• 輸出科學記數法（無單位）值高於1e27

希望這是很有幫助的。

f2si<-function (number, rounding=F, digits=ifelse(rounding, NA, 6)) 
{ 
    lut <- c(1e-24, 1e-21, 1e-18, 1e-15, 1e-12, 1e-09, 1e-06, 
     0.001, 1, 1000, 1e+06, 1e+09, 1e+12, 1e+15, 1e+18, 1e+21, 
     1e+24, 1e+27) 
    pre <- c("y", "z", "a", "f", "p", "n", "u", "m", "", "k", 
     "M", "G", "T", "P", "E", "Z", "Y", NA) 
    ix <- findInterval(number, lut) 
    if (ix>0 && ix<length(lut) && lut[ix]!=1) { 
     if (rounding==T && !is.numeric(digits)) { 
      sistring <- paste(round(number/lut[ix]), pre[ix]) 
     } 
     else if (rounding == T || is.numeric(digits)) { 
      sistring <- paste(signif(number/lut[ix], digits), pre[ix]) 
     } 
     else { 
      sistring <- paste(number/lut[ix], pre[ix]) 
     } 
    } 
    else { 
     sistring <- as.character(number) 
    } 
    return(sistring) 
} 

f2si(12345) 
[1] "12.345 k" 
f2si(12345, T) 
[1] "12 k" 
f2si(10^31) 
[1] "1e+31" # (previous version would output "1e+07 Y" 
f2si(10^-25) 
[1] "1e-25" # (previous version would throw error) 
f2si(123456789) 
[1] "123.457 M" # (previous version would output ""123.456789 M" 
f2si(123456789, digits=4) 
[1] "123.5 M" # (note .456 is rounded up to .5) 

從這段代碼中，爲常用的財務單位（K，MM，Bn，Tr）編寫類似的函數也很容易。

Answer 3

稍作修改的版本考慮到負數：

f2si<-function (number, rounding=F, digits=ifelse(rounding, NA, 6)) 
{ 
mysign <- "" 
if (number<0) { 
    mysign <- "-" 
} 
number <- abs(number) 
lut <- c(1e-24, 1e-21, 1e-18, 1e-15, 1e-12, 1e-09, 1e-06, 
    0.001, 1, 1000, 1e+06, 1e+09, 1e+12, 1e+15, 1e+18, 1e+21, 
    1e+24, 1e+27) 
pre <- c("y", "z", "a", "f", "p", "n", "u", "m", "", "k", 
    "M", "G", "T", "P", "E", "Z", "Y", NA) 
ix <- findInterval(number, lut) 
if (ix>0 && ix<length(lut) && lut[ix]!=1) { 
    if (rounding==T && !is.numeric(digits)) { 
     sistring <- paste(mysign,mysign,round(number/lut[ix]), pre[ix]) 
    } 
    else if (rounding == T || is.numeric(digits)) { 
     sistring <- paste(mysign,signif(number/lut[ix], digits), pre[ix],sep="") 
    } 
    else { 
     sistring <- paste(mysign,number/lut[ix], pre[ix],sep="") 
    } 
} else { 
    sistring <- paste(mysign,as.character(number),sep="") 
} 
return(sistring) 

}

Answer 4

我一直在尋找千（K），百萬（M）和億（B）數轉換器。我修改了這個例程以獲取一個數字向量/單個數字，並將所需的輸出分發出去。

CurrencyFormat <-function (number,rounding=F) 
{ 
    first <- TRUE 
    lut <- c(1, 1000, 1000000, 1000000000,1000000000000) 
    pre <- c("", "K", "M", "B", "T") 
    if (length(number) > 1) { 
     for (cnt in 1:length(number)){   
      ix <- findInterval(number[cnt], lut) 
      if (ix != 0 | ix != 1){ 
       if (rounding==T) { 
        sistring <- paste(round(number[cnt]/lut[ix]), pre[ix]) 
       } 
       else { 
        sistring <- paste(signif(number[cnt]/lut[ix],digits=5), pre[ix]) 
       } 
       if (first){ 
        tnumber <- sistring 
        fnumber <- tnumber 
        first <- FALSE 
       } 
       else 
        fnumber <- append(fnumber, sistring) 
      } 
      else { 
       sistring <- number[cnt] 
       if (first){ 
        tnumber <- sistring 
        fnumber <- tnumber 
        first <- FALSE 
       } 
       else 
        fnumber <- append(fnumber, sistring) 
      } 
     } 
     return(fnumber) 
    } 
    else{ 
     ix <- findInterval(number, lut) 
     if (ix != 0 | ix != 1){ 
      if (rounding==T) { 
       sistring <- paste(round(number/lut[ix]), pre[ix]) 
      } 
      else { 
       sistring <- paste(signif(number/lut[ix],digits=5), pre[ix]) 
      } 
      return(sistring) 
     }  
     else 
      return(number) 
    } 
} 

例子：

CurrencyFormat(1.25,F) 
[1] "1.25 " 

CurrencyFormat(1000.25,F) 
[1] "1.0002 K" 

CurrencyFormat(c(1,45,1234, 4.36e+06, 2.84e+04, 2.01e+06),F) 
[1] "1 "  "45 "  "1.234 K" "4.36 M" "28.4 K" "2.01 M"