Convert numbers to SI prefix
Is there a R function (or any package) allowing to format numbers (integer) using standard unit prefix (Kilo, Mega etc ...), so
10 -> 10
1000 -> 1K
0.01 - > 10m
etc ... I can do it myself but I would prefer to not reinvent the wheel.
Solution 1:
require(sitools)
f2si(80000)
[1] "80 k"
f2si(8E12)
[1] "8 T"
It seems to be very simplistic as it appends two spaces if no SI prefix is used:
f2si(80)
[1] "80 "
The function is easy to modify to include rounding. I also fixed the issue with appended spaces.
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"
Solution 2:
I came here with the same question. Thanks to Roland for his answer; I built on his code with a few changes:
- Allows significant figures to be specified when rounding=FALSE (defaults to 6 just like the 'signif' builtin function)
- Doesn't throw an error with values below 1e-24
- Outputs scientific notation (no units) for values above 1e27
Hope this is helpful.
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)
From this code it's pretty easy to write a similar function for commonly used financial units (K, MM, Bn, Tr), too.
Solution 3:
This is simple to vectorise using case_when from dplyr, and it's much easier on the eyes:
library(dplyr)
si_number = function(x, digits) {
compress = function(x, n) {
signif(x * 10^(-n), digits)
}
case_when(
x >= 1e6 ~ paste0(compress(x, 6), "M"),
x >= 1000 ~ paste0(compress(x, 3), "k"),
x >= 1 ~ as.character(compress(x, 0)),
x >= 0.001 ~ paste0(compress(x, -3), "m"),
x >= 1e-6 ~ paste0(compress(x, -6), "u")
)
}
Solution 4:
I was looking for Thousand(K), million(M) and Billion(B) number converter. I modified this routine to take a numeric vector/single number spitting out the required output.
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)
}
}
Examples:
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"
Solution 5:
Slightly modified version to account for negative numbers :
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)
}