[R] How to replace Inf by zero?

[ONKELINX, Thierry]

Dear Marlene,

Have a look at is.infinite(). Replacing them by zero is not a very
bright idea if you want the mean of the resulting vector. Have a look at
the example below.

#create a vector
x <- rnorm(100, mean = 1000)
#replace 20 values with Inf
x[sample(seq_along(x), 20, replace = FALSE)] <- Inf
mean(x)

#replace Inf with zero
y <- x
y[is.infinite(y)] <- 0
#replace inf with NA
x[is.infinite(x)] <- NA
mean(x, na.rm = TRUE)
mean(y) 

HTH,

Thierry

------------------------------------------------------------------------
----
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature
and Forest
Cel biometrie, methodologie en kwaliteitszorg / Section biometrics,
methodology and quality assurance
Gaverstraat 4
9500 Geraardsbergen
Belgium
tel. + 32 54/436 185
Thierry.Onkelinx at inbo.be
www.inbo.be

To call in the statistician after the experiment is done may be no more
than asking him to perform a post-mortem examination: he may be able to
say what the experiment died of.
~ Sir Ronald Aylmer Fisher

The plural of anecdote is not data.
~ Roger Brinner

The combination of some data and an aching desire for an answer does not
ensure that a reasonable answer can be extracted from a given body of
data.
~ John Tukey

-----Oorspronkelijk bericht-----
Van: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
Namens marlene marchena
Verzonden: vrijdag 29 mei 2009 15:18
Aan: R-help at r-project.org
Onderwerp: [R] How to replace Inf by zero?

Hi R users,

Someone knows how to replace Infinite value by zero. I have a vector
with some Inf value and I want to substitute these values by zero to get
the mean of the components of the vector.

Any idea?

Many thanks,

Marlene.

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