Hi, I'm needing some help finding a function to read a large text file into an array in R. The data are essentially presence / absence / na data for many species and come as a grid with each species name (after two spaces) at the beginning of the matrix defining the map for that species. An excerpt could therefore be:
SPECIES1 999001099 900110109 011101000 901100101 110100019 901110019 SPECIES2 999000099 900110119 011101100 901010101 110000019 900000019 SPECIES3 999001099 900100109 011100010 901100100 110100019 901110019 where 9 is actually na, 0 is absence and 1 presence. The final array I want to create should have dimensions that are the x and y coordinates and the number of species (known in advance). (In this example dim = c(9,6,3)). It would be sort of neat if the code could also read the species name into the appropriate names attribute, but this is a refinement that I could probably do if someone can help me read the data into R and into an array in the first place. I'm currently thinking a line by line approach using readLines might be the best option, but I've got a very long file - well over 100 species, each a matrix of 70 x 100 datapoints. making this option rther time consuming, I expect - especially as the next dataset has 1300 species and a much larger grid... Any hints would be gratefully recieved. Colin Beale Macaulay Land Use Research Institute ______________________________________________ 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
