[R] Matrix set value problem

[ONKELINX, Thierry]

This is similar to FAQ 7.31. my is *printed* as 1, but in fact it is
slightly smaller. Try print(my, digits = 15). Rounding my works.

m<-matrix(nrow=10,ncol=10)
i<-1001
mx<-trunc(i/1000)
my<-round((i/1000-mx)*1000, 0)
m[mx, my]<-1

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 op 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 op r-project.org [mailto:r-help-bounces op r-project.org]
Namens Valentino Botta
Verzonden: donderdag 3 juli 2008 10:03
Aan: r-help op r-project.org
Onderwerp: [R] Matrix set value problem


the following code:

m<-matrix(nrow=10,ncol=10)
i<-1001
mx<-trunc(i/1000)
my<-(i/1000-mx)*1000
m[mx,my]<-1

does not assign the value at the matrix m[1,1]
Any hints?

Thanks
v

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