Hi everyone,
I am trying to use the values from every cell of the data frame in a
further calculation.
This is the code that I am using to catch every element of the data-frame.
while (a<=10)
{
while (b<=10)
{
n<-as.numeric(df[a,b)];
...;
}
}
The problem is that when I print out 'n' I get the following errors :
"NULL" (if printed without as.numeric), and "numeric(0)" if
printed with
the as.numeric.
Again, if I use the same command without the loop, it gives the correct
answer.
Would be grateful for your inputs and ideas on this matter. Thanks in
advance,
Sahana.
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Sahana, The notation df[a,b)] is plain wrong. I think you meant (but I may be mistaken) df[a, b] and I am not still sure if that would work in your example. Have you instead considered subset()? E.g., subset(df, a <= 10 & b <= 10) See ?subset for more details. Also, "df" is a very bad name for your data.frame. Check ?df to know why. HTH, Jorge.- On Fri, Mar 22, 2013 at 10:34 PM, Sahana Srinivasan <> wrote:> Hi everyone, > I am trying to use the values from every cell of the data frame in a > further calculation. > This is the code that I am using to catch every element of the data-frame. > > while (a<=10) > { > while (b<=10) > { > n<-as.numeric(df[a,b)]; > ...; > } > } > > The problem is that when I print out 'n' I get the following errors : > "NULL" (if printed without as.numeric), and "numeric(0)" if printed with > the as.numeric. > > Again, if I use the same command without the loop, it gives the correct > answer. > > Would be grateful for your inputs and ideas on this matter. Thanks in > advance, > Sahana. > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. >[[alternative HTML version deleted]]
On 22-03-2013, at 12:34, Sahana Srinivasan <sahanasrinivasan.91 at gmail.com> wrote:> Hi everyone, > I am trying to use the values from every cell of the data frame in a > further calculation. > This is the code that I am using to catch every element of the data-frame. > > while (a<=10) > { > while (b<=10) > { > n<-as.numeric(df[a,b)];The )] should be ]).> ...; > } > } > > The problem is that when I print out 'n' I get the following errors : > "NULL" (if printed without as.numeric), and "numeric(0)" if printed with > the as.numeric. > > Again, if I use the same command without the loop, it gives the correct > answer. > > Would be grateful for your inputs and ideas on this matter. Thanks in > advance,Data? Reproducible example? Without the contents of your dataframe no sensible answer can be given. E.g. use dput(head(df)) Berend> Sahana. > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help at r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code.
Le 22/03/13 12:34, Sahana Srinivasan a ?crit :> while (a<=10) > { > while (b<=10) > { > n<-as.numeric(df[a,b)]; > ...; > } > } > > The problem is that when I print out 'n' I get the following errors : > "NULL" (if printed without as.numeric), and "numeric(0)" if printed with > the as.numeric.Perhaps with n<-as.numeric(df[a,b]) )] are reversed Marc -- __________________________________________________________ Marc Girondot, Pr Laboratoire Ecologie, Syst?matique et Evolution Equipe de Conservation des Populations et des Communaut?s CNRS, AgroParisTech et Universit? Paris-Sud 11 , UMR 8079 B?timent 362 91405 Orsay Cedex, France Tel: 33 1 (0)1.69.15.72.30 Fax: 33 1 (0)1.69.15.73.53 e-mail: marc.girondot at u-psud.fr Web: http://www.ese.u-psud.fr/epc/conservation/Marc.html Skype: girondot