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> read.table("data.txt",header=TRUE, colClasses=c("character","character","numeric","character", "numeric","numeric")) a b c d e f 1 SPX LSZ 100 C 0 34.40 2 SPX LSZ 100 P 0 1.30 3 SPX LSZ 105...
I don't know the difference between rank and order.For example: > x=c(10,30,30,20,10,20) > x[rank(x,ties.method="first")] [1] 10 10 20 30 30 20 > x[order(x)] [1] 10 10 20...
I had installed R and MySQL ,then I input : > install.packages('RMySQL',type='source') show the message below, Why? Why shows "ERROR: configuration failed for package 'RMySQL'"? ??URL?http://mirrors.xmu.edu.cn/CRAN/src/contrib/RMySQL_0.9-3...
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