R help - Mar 2009 - separating the integer part of a number from the fractional part

I have columns of decimal numbers (representing fraction day of year). I need
to separate the fractional part of the number (to the right of the radix
point) from the integer part. For example, if the number were '207.65'
Id
like to make a separate column which contained only '65' or even better,
'0.65.' What I am trying to do is separate day from night. Any ideas??
Thanks.
-JPG
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csrc2010 wrote:
> I have columns of decimal numbers (representing fraction day of year). I
need
> to separate the fractional part of the number (to the right of the radix
> point) from the integer part. For example, if the number were
'207.65' Id
> like to make a separate column which contained only '65' or even
better,
> '0.65.' What I am trying to do is separate day from night. Any
ideas??
> Thanks.
> -JPG
> 207.65 %%1
[1] 0.65
> 207.65 - trunc(207.65)
[1] 0.65
> 207.65 - floor(207.65)
[1] 0.65

Notice differences for negative numbers though:
> -207.65 %%1
[1] 0.35
> -207.65 - trunc(-207.65)
[1] -0.65
> -207.65 - floor(-207.65)
[1] 0.35



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