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Is there a proper function for transforming a character to a number instead of using i=match('c',letters) # 3 Thanks. Josef Eschgf??ller -- Josef Eschgf??ller Dipartimento Matematico Universita' di Ferrara http://felix.unife.it

...ly column names but no values? I tried this indirect way: # Void df with titles from ... Newvoid = function (...) {a=c(...); m=length(a) titles=paste(a,collapse=' ') conn=textConnection(titles) tab=read.table(conn,header=T) close(conn); tab} Thanks Josef Eschgf??ller -- Josef Eschgf??ller Dipartimento Matematico Universita' di Ferrara http://felix.unife.it

...--------------------------------------- u=grep('\\{[\\-u]x',a,perl=T) # equivalent to u=grep('\{[\-u]x',a,perl=T) # but u=grep('\w',a,perl=T) # is not correct and requires u=grep('\\w',a,perl=T) --------------------------------------- Josef Eschgf??ller -- Josef Eschgf??ller Dipartimento Matematico Universita' di Ferrara http://felix.unife.it

How precise is R numerically? For example I wrote the following function for calculating the volume of the ball inscribed in the unit cube in m dimensions. In order to see what happens in 40 dimensions, I created an output of 24 digits. But how many are precise? Thanks Josef Eschgf?ller Ferrara --------------------------------------- Vol = function (m) {if (m<=1) 1 else Vol(m-2)*pi/(m+m)} for (m in 1:40) {x=sprintf('%2d %.24f',m,Vol(m)) print(x)} --------------------------------------- 1 1.000000000000000000000000 2 0.785398163397448278999491 3 0...

Hi. I need to draw a circle whit center (a,b) and radio r. So I use the R code below a<-1.975 # valore x del centro b<-1.215 # valores y del centro r<-1.46 # radio x1<-seq(a-r,a+r,by=0.01); #los valores de x yp<-sqrt(r^2-(x1-a)^2)+b; # los valores y a partir de la ra??z positiva yn<-(-1)*sqrt(r^2-(x1-a)^2)+b; # los valores y a partir de la ra??z negativa x<-c(x1,x1);

R-help, Sometimes I define functions I wish to have in any R session. The obvious thing to do is copy-paste the code The thing is that sometimes I don't know where I have the function code. My question is if somehow I could define a function and "introduce" it (let's say 'base' package ) so that could be used anytime I run a different R project. Thank you in advance