[R] Formatting numbers for display

[Tejas Kale]

I think the following code provides output that Dennis wants as well
as gets rid of the white space David mentioned.

digitTruncation <- function(x)
{
  ifelse(x>10^7, gsub("(\\d)[.].*", "\\1", x), ifelse(x<1, formatC(x, digits=3,
                                                                   format='fg'),
                                                      formatC(x,
width=length(x),
                                                              format='fg',
                                                              digits=8,
                                                              flag='')))
}


VALUES    <- c(123456789, 12345678, 1234567.9, 123456.89, 12345.789,
1234.6789, 123.56789, 12.456789, 1.3456789, 0.123456789, 0.0123456789,
0.00123456789)

digitTruncation(VALUES)
 [1] "123456789" "12345678"  "1234567.9" "123456.89" "12345.789"
"1234.6789" "123.56789" "12.456789" "1.3456789" "0.123"     "0.0123"
 "0.00123"

tx <- c( 0.55555555, 55.555555555, 555555555555555.55555555, 55.55)

digitTruncation(tx)
[1] "0.556"           "55.555556"       "555555555555556" "55.55"


Hope this helps.

Tejas

On Fri, Aug 3, 2012 at 1:41 PM, Berend Hasselman <bhh at xs4all.nl> wrote:
>
>
> David Winsemius wrote
> >
> > I didn't get the same results as requested with a wider variety of
> > tests using those formatting methods. Here's what I could offer:
> >
> >   form3 <- function (x) switch(findInterval(x, c( 0, 1, 10^7, Inf)),
> >                                       format(x, digits=3),
> >                                       formatC(x, width=8,  format="f",
> > drop0trailing=FALSE),
> >                                       trunc(x) )
> >
> >   tx <- c( 0.55555555, 55.555555555, 555555555555555.55555555)
> >
> >  > sapply(tx, form3)
> > [1] "0.556"           " 55.5556"       "555555555555555"
> >
> > (Still not getting the 8 digits in the intermediate value cases. Have
> > not figured out how to get rid of leading space.)
> >
>
> How about this to get rid of leading space:
>
> form3 <- function (x) sub("^ +","", switch(findInterval(x, c( 0, 1, 10^7,
> Inf)),
>                                     format(x, digits=3),
>                                     formatC(x, width=8,  format="f",
> drop0trailing=FALSE),
>                                     trunc(x) )
>                          )
>
> Berend
>
>
>
>
> --
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