[R] "reverse truncate" to extract only decimal values

[T.D.Rudolph]

This one really sheds light on that old adage
"...When you can't see the forest for the trees...."!



Sarah Goslee wrote:
> 
> You could do something like this:
> 
>> revtrunc <- function(x) { x - floor(x) }
> 
>> revtrunc(39.5)
> [1] 0.5
> 
> But note:
>> revtrunc(-39.5)
> [1] 0.5
> 
> I'm not sure what you'd want for negative numbers. One possibility:
> 
> revtrunc <- function(x) { sign(x) * (x - floor(x)) }
>> revtrunc(39.5)
> [1] 0.5
>> revtrunc(-39.5)
> [1] -0.5
> 
> Sarah
> 
> On Thu, Apr 16, 2009 at 5:30 PM, T.D.Rudolph <prairie.picker at gmail.com>
> wrote:
>>
>> hello there,
>>
>> Is there a way of truncating in the opposite direction so as to retain
>> only
>> the values to the right of the decimal??
>>
>> i.e. rather than:
>>> trunc(39.5)
>> [1] 39
>>
>> i would get something like:
>>> revtrunc(39.5)
>> [1] 0.5
>>
>> I've been searching to no avail but I imagine there is a very simple
>> solution!
>> Tyler
> 
> 
> 
> -- 
> Sarah Goslee
> http://www.functionaldiversity.org
> 
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> and provide commented, minimal, self-contained, reproducible code.
> 
> 

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