From: Leonardo Sepulveda Durán <leonardosepulveda_at_gmail.com>

Date: Sat 13 Aug 2005 - 00:44:25 EST

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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 Received on Sat Aug 13 00:52:12 2005

Date: Sat 13 Aug 2005 - 00:44:25 EST

Hello!!!

I have a folder (C:/R/) with matrix files, named by number, i.e. 0.mat, 1.mat,...,1250.mat. In this case, they are 5x5 simetric matrices. I would like to compute a property for each matrix and put calculated values into a data frame for posterior ploting and printing. Below there is an example for 7 matrices (0.mat..6.mat)

#define data frame

L <- data.frame(frame=numeric(7), L=numeric(7))
f0<-1/(5*(5-1)) # first variable for computation

#loop over matrices, Open it , calculate property and put into data frame

for(i in 0:6){

m<-matrix(scan('C:/R/i.mat', n=5*5),5,5, byrow=TRUE) # load matrix f1<-geodist(m) f2<-sum(colSums(f1$gdist)) l <-f0*f2 # Calculate property L[i+1, ]<-c(i,l) # Fill data frame

}

but the matrix cannot be loaded, because it try to open a file named "i.mat". I don`t know how to loop with a counter named 'i', and use it to define the name of the file too. How can i do it? I have not found the way.

Leonardo

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 Received on Sat Aug 13 00:52:12 2005

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