help, please! matrix operations inside 3 nested loops

Fridolin wrote

hello, this is my script:

#1) read in data:
daten<-read.table('K:/Analysen/STRUCTURE/input_STRUCTURE_tab_excl_5_282_559.txt',
header=TRUE, sep="\t")
daten<-as.matrix(daten)

#2) create empty matrix:
indxind<-matrix(nrow=617, ncol=617) 
indxind[1:20,1:19]

You should at least initialize indxind to 0 with

indxind<-matrix(0,nrow=617, ncol=617) 

because the default for matrix is to use NA for data.

Berend




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