You need to basically use table on factors with fixed pre-specified levels. For example:
x <- c(runif(100,10,40), runif(100,43,55)) y <- c(runif(100,7,35), runif(100,37,50)) z <- c(runif(100,10,42), runif(100,45,52)) xx <- ceiling(x); yy <- ceiling(y); zz <- ceiling(z) mylevels <- min( c(xx, yy, zz) ) : max( c(xx, yy, zz) ) out <- cbind( table( factor(xx, levels=mylevels) ), table( factor(yy, levels=mylevels) ), table( factor(zz, levels=mylevels) ) ) You could replace the last command with simply sapply( list(xx, yy, zz), function(vec) table( factor(vec, levels=mylevels) ) ) Regards, Adai Rubén Roa-Ureta wrote: > Hi ComRades, > > I want to make a matrix of frequencies from vectors of a continuous > variable spanning different values. For example this code > x<-c(runif(100,10,40),runif(100,43,55)) > y<-c(runif(100,7,35),runif(100,37,50)) > z<-c(runif(100,10,42),runif(100,45,52)) > a<-table(ceiling(x)) > b<-table(ceiling(y)) > c<-table(ceiling(z)) > a > b > c > > will give me three tables that start and end at different integer > values, and besides, they have 'holes' in between different integer > values. Is it possible to use 'table' to make these three tables have > the same dimensions, filling in the absent labels with zeroes? In the > example above, the desired tables should all start at 8 and tables 'a' > and 'c' should put a zero at labels '8' to '10', should all put zeros in > the frequencies of the labels corresponding to the holes, and should all > end at label '55'. The final purpose is the make a matrix and use > 'matplot' to plot all the frequencies in one plot, such as > > #code valid only when 'a', 'b', and 'c' have the proper dimension > p<-mat.or.vec(48,4) > p[,1]<-8:55 > p[,2]<-c(matrix(a)[1:48]) > p[,3]<-c(matrix(b)[1:48]) > p[,4]<-c(matrix(c)[1:48]) > matplot(p) > > I read the help about 'table' but I couldn't figure out if dnn, > deparse.level, or the other arguments could serve my purpose. Thanks for > your help > Rubén > > ______________________________________________ > 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 > and provide commented, minimal, self-contained, reproducible code. > > > ______________________________________________ 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 and provide commented, minimal, self-contained, reproducible code.