R语言的读取写入文本和二进制文件

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[代码] 读取写入文本和二进制文件

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# Goal: Reading and writing ascii files, reading and writing binary files. # And, to measure how much faster it is working with binary files. # First manufacture a tall data frame: # FYI -- runif(10) yields 10 U(0,1) random numbers. B = data.frame(x1=runif(100000), x2=runif(100000), x3=runif(100000)) summary(B) # Write out ascii file: write.table(B, file = "/tmp/foo.csv", sep = ",", col.names = NA) # Read in this resulting ascii file: C=read.table("/tmp/foo.csv", header = TRUE, sep = ",", row.names=1) # Write a binary file out of dataset C: save(C, file="http://img.xue163.com/tmp/foo.binary") # Delete the dataset C: rm(C) # Restore from foo.binary: load("/tmp/foo.binary") summary(C) # should yield the same results # as summary(B) above. # Now we time all these operations -- cat("Time creation of dataset:\n") system.time({ B = data.frame(x1=runif(100000), x2=runif(100000), x3=runif(100000)) }) cat("Time writing an ascii file out of dataset B:\n") system.time( write.table(B, file = "/tmp/foo.csv", sep = ",", col.names = NA) ) cat("Time reading an ascii file into dataset C:\n") system.time( {C=read.table("/tmp/foo.csv", header = TRUE, sep=",", row.names=1) }) cat("Time writing a binary file out of dataset C:\n") system.time(save(C, file="http://img.xue163.com/tmp/foo.binary")) cat("Time reading a binary file + variablenames from /tmp/foo.binary:\n") system.time(load("/tmp/foo.binary")) # and then read it in from binary file

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