On Nov 10, 2009, at 7:23 AM, Michael Pearmain wrote:
Hi All,
I have am using Sweave and the \Sexpr{} to place some numeric
variables in
my tex document. I want to format the number prior to entry so they
read
slightly more elegantly.
Say i have the following numbers
x <- 0.00487324
y <- 0.000000432
z <- 0.567
I would like to have the numbers displayed as follows
x1 <- 0.0049
y1 <- 0.00000043
z1 <- 0.57
I've seen i can use sprintf("%.3f", pi) for example to get the
formating
after the decimal place, but i can't figure out an elegant way to
find the
position of the first non-zero entry to allow me to substitute this
value
into the sprintf command.
Can anyone offer any advise?
Thanks in advance
Mike
It looks like you want the numbers formatted to 2 significant digits,
rather than to a fixed number of decimal places. Thus, use:
> format(x, digits = 2, scientific = FALSE)
[1] "0.0049"
> format(y, digits = 2, scientific = FALSE)
[1] "0.00000043"
> format(z, digits = 2, scientific = FALSE)
[1] "0.57"
See ?format and note the 'digits' and 'scientific' arguments.
HTH,
Marc Schwartz
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