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Rounding fractional numbers to nearest fraction

Ken Termiso

Wed, May 25, 2005 11:46 AM

Thx for the help...

mdiv <- function(dec)
{
	dec <- dec * 4
	dec <- round(dec, 0)
	dec <- dec / 4
	dec
}

where m is a matrix --

m1 <- apply(m, 1, mdiv)

...but it looks like as.integer(x.1*4)/4 or (round(x.1*4,0))/4 might be 
easier...

thx again,
ken

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                      "Ken Termiso"
                      <jerk_alert at hotmail.c        To:       
r-help at stat.math.ethz.ch
                      om>                          cc:
                      Sent by:                     Subject:  [R] Rounding 
fractional numbers to nearest fraction
                      r-help-bounces at stat.m
                      ath.ethz.ch


                      05/25/2005 13:27





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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