Thanks Brian,
You're right ! They were strings and I thought they were numerics. I just had to force the conversion and Everything is now fine. Thanks for your help. It was really stupid from me, but I couldn't imagine that these colomns were interpreted as strings. Sylvain Le 24 nov. 2010 à 22:20, Brian Diggs a écrit : > On 11/22/2010 9:16 AM, wphantomfr wrote: >> DEar list members, >> >> I am currently using Sweave with LaTeX which is great. >> >> I can use xtable for formatting outp of tables but I have a problem >> setting the number of decimals in xtables when used with dataframe. >> >> I have found an example on the net ith matrix and it works. >> >> For example this works : >>>> tmp<- matrix(rnorm(9), 3, 3) >>>> xtmp<- xtable(tmp) >>>> digits(xtmp)<- c(0,0,3,4) >>>> print(xtmp, include.rownames = FALSE) # row names >> >> produced : >>> % latex table generated in R 2.12.0 by xtable 1.5-6 package >>> % Mon Nov 22 17:35:00 2010 >>> \begin{table}[ht] >>> \begin{center} >>> \begin{tabular}{rrr} >>> \hline >>> 1& 2& 3 \\ >>> \hline >>> -2& -2.158& 2.8886 \\ >>> 1& 1.330& 0.4677 \\ >>> -0& 0.486& -0.3319 \\ >>> \hline >>> \end{tabular} >>> \end{center} >>> \end{table} >> >> >> >> But this won't work : >>>> mydata >>> TEST t ddl p CONDITION >>> 2 R1 3.01109061083632 16 0.00828552765650315 C1 >>> 3 R2 3.30476953908811 16 0.00447412002109504 C1 >>> 4 DR 2.86343993410509 16 0.0112631908739966 C1 >>> 5 R1 1.05386387510206 16 0.30760068470456 C2 >>> 6 R2 3.04997140665209 16 0.00763921045771104 C2 >>> 7 DR 2.25175987512241 16 0.0387401575011488 C2 >> >> but >>>> xtable(mydata,digits=2) >> >> produced >> >>> % latex table generated in R 2.12.0 by xtable 1.5-6 package >>> % Mon Nov 22 18:13:47 2010 >>> \begin{table}[ht] >>> \begin{center} >>> \begin{tabular}{rlllll} >>> \hline >>> & TEST& t& ddl& p& CONDITION \\ >>> \hline >>> 2& R1& 3.01109061083632& 16& 0.00828552765650315& C1 \\ >>> 3& R2& 3.30476953908811& 16& 0.00447412002109504& C1 \\ >>> 4& DR& 2.86343993410509& 16& 0.0112631908739966& C1 \\ >>> 5& R1& 1.05386387510206& 16& 0.30760068470456& C2 \\ >>> 6& R2& 3.04997140665209& 16& 0.00763921045771104& C2 \\ >>> 7& DR& 2.25175987512241& 16& 0.0387401575011488& C2 \\ >>> \hline >>> \end{tabular} >>> \end{center} >>> \end{table} >> >> >> >> >> I have also tried setting the digits with c(0,0,4,0,4,0), using also >> the 'display' argument to specify the type of each column... noway... >> >> >> What am I missing ? > > My guess is that the data frame is not what you think it is. In particular, > I bet the t and p columns are not really numbers, but strings or factors. > Does str(mydata) show this? > >> Thanks in advance >> >> Sylvain Clément > > -- > Brian S. Diggs, PhD > Senior Research Associate, Department of Surgery > Oregon Health & Science University ______________________________________________ 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.