On Fri, 2005-08-26 at 14:44 +0200, Sigbert Klinke wrote: > Hi, > > I want to compute the quantiles of Chi^2 distributions with different > degrees of freedom like > > x<-cbind(0.005, 0.010, 0.025, 0.05, 0.1, 0.5, 0.9, 0.95, 0.975, 0.99, 0.995) > df<-rbind(1:100) > m<-qchisq(x,df) > > and hoped to get back a length(df) times length(x) matrix with the > quantiles. Since this does not work, I use > > x<-c(0.005, 0.010, 0.025, 0.05, 0.1, 0.5, 0.9, 0.95, 0.975, 0.99, 0.995) > df<-c(1:100) > m<-qchisq(x,df[1]) > for (i in 2:length(df)) { > m<-rbind(m,qchisq(x,df[i])) > } > dim(m)<-c(length(df),length(x)) > > Is there a way to avoid the for loop ? > > Thanks Sigbert
See ?sapply x <- c(0.005, 0.010, 0.025, 0.05, 0.1, 0.5, 0.9, 0.95, 0.975, 0.99, 0.995) df <- c(1:100) mat <- sapply(x, qchisq, df) > dim(mat) [1] 100 11 > str(mat) num [1:100, 1:11] 3.93e-05 1.00e-02 7.17e-02 2.07e-01 4.12e-01 ... HTH, Marc Schwartz ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html