Hi,
For your first condition, this could be used:
gsub("(\\d)[.].*","\\1",498888888.85)
[1] "498888888"
Second condition:
formatC(4333.78889,width=8,format="f",digits=2,flag="0")
#[1] "04333.79"
formatC(884333.78889,width=8,format="f",digits=2,flag="0")
#[1] "884333.79"
Third condition:
sprintf("%.3f",0.0123556)
#[1] "0.012"
#You can create a function similar to this. (This still have some bugs).
fun1<-function(x)
ifelse(x>10^7,gsub("\\d)[.].*","\\1",x),ifelse(x<10^7 &
x>1,formatC(x,width=8,format="f",digits=2,flag="0"),sprintf("%.3f",x))
)
fun1(488.85)
#[1] "00488.85"
fun1(0.1233555)
#[1] "0.123"
fun1(VALUES)
# [1] "123456789" "12345678" "1234567.90" "123456.89" "12345.79"
#[6] "01234.68" "00123.57" "00012.46" "00001.35" "0.123"
#[11] "0.012" "0.001"
A.K.
----- Original Message -----
From: Dennis Fisher <fis...@plessthan.com>
To: r-h...@stat.math.ethz.ch
Cc:
Sent: Thursday, August 2, 2012 10:34 PM
Subject: [R] Formatting numbers for display
Colleagues
R 2.15.1
OS X
I have a lengthy script that generates a positive number that I display in a
graphic using text. The range of possible values is quite large and I am
looking for an efficient means to format.
1. If the number is large (e.g., > 10^7), I want to display only the
integer portion.
2. If it is less than 10^7 but > 1, I want to display 8 characters, e.g.,
12345.78
1234.678
123.5678
3. If it is less than 1, I want to display at least three significant
digits, e.g.
0.123
0.0123
0.00123
0.000123
If there are any inconsistencies in my proposal, I apologize.
I can accomplish this by brute force with conditionals, -ceiling(log10(VALUE)),
round. However, I expect that there is a more efficient approach, possibly
using sprint.
For the "dput"-ers, use the following as potential input:
VALUES <- c(123456789, 12345678, 1234567.9, 123456.89, 12345.789, 1234.6789,
123.56789, 12.456789, 1.3456789, 0.123456789, 0.0123456789, 0.00123456789)
Thanks for any thoughts.
Dennis
Dennis Fisher MD
P < (The "P Less Than" Company)
Phone: 1-866-PLessThan (1-866-753-7784)
Fax: 1-866-PLessThan (1-866-753-7784)
www.PLessThan.com
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and provide commented, minimal, self-contained, reproducible code.
