How to create multiple ,csv files in R?

Question

I have a .csv file with data for different chromosomes. The chromosomes names are stored in the first column(column name: Chr). My aim is to separate the data for each chrom

Answer 1

Illustrating a one liner using plyr and the dataset iris

plyr::d_ply(iris, .(Species), function(x) write.csv(x, 
  file = paste(x$Species, ".csv", sep = "")))