[R] Rounding fractional numbers to nearest fraction

[bogdan romocea]

Multiply by 4, round and divide by 4.
a <- c(1.15,5.82)
round(a*4,digits=0)/4



-----Original Message-----
From: Ken Termiso [mailto:jerk_alert at hotmail.com]
Sent: Wednesday, May 25, 2005 1:27 PM
To: r-help at stat.math.ethz.ch
Subject: [R] Rounding fractional numbers to nearest fraction


Hi all,

I've got a matrix of fractional data that is all positive and greater than 
zero that I would like to "loosely" classify, for lack of a better word. It 
looks something like this :

1.07   1.11   1.27   1.59   0.97   0.76
2.23   0.98   0.71   0.88   1.19   1.02


What I'm looking for is a way to round these numbers to the nearest 0.25, 
i.e. the above matrix would be transformed to :

1.00   1.00   1.25   1.50   1.00   0.75
2.25   1.00   0.75   1.00   1.25   1.00


Anyone have a clever way to do this??

Thanks in advance,
Ken

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