Jonathan -
   If I understand correctly,

     max(0,floor(log(x,10)))

will return the value you want.

                                        - Phil Spector
                                         Statistical Computing Facility
                                         Department of Statistics
                                         UC Berkeley
                                         spec...@stat.berkeley.edu


On Tue, 7 Dec 2010, Jonathan P Daily wrote:

I have a need to find the order of number to get a scaling parameter as a
power of 10. I have a function that works *so far*, but it is ugly and
probably buggy. In the interest of avoiding code-based outliers in my
data, I thought I would ask if anyone here has a better way.

scl <- function(x){
+ length(charToRaw(format(trunc(x), scientific = F)))-1}
a <- 123456789
b <- 1E15
c <-  12.345
scl(a)
[1] 8
scl(b)
[1] 15
scl(c)
[1] 1

Thanks
--------------------------------------
Jonathan P. Daily
Technician - USGS Leetown Science Center
11649 Leetown Road
Kearneysville WV, 25430
(304) 724-4480
"Is the room still a room when its empty? Does the room,
the thing itself have purpose? Or do we, what's the word... imbue it."
    - Jubal Early, Firefly

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