如何将无空间数据转换为R中定界的制表符？

Question

I have a data set in form of:(this is just an example)

1324501020
3241030205
4332020134

which each row represents responses of an examinee to a set of items on a test. The data are stored in a text file (eg data.txt) but I need to convert them into a matrix format such that each number be place in a cell, like this:

1 3 2 4 5 0 1 0 2 0
3 2 4 1 0 3 0 2 0 5
4 3 3 2 0 2 0 1 3 4

in other words, the final data set supposed to be a matrix of numbers in which columns contain responses to each item and rows are examinees. Any idea??

Answer 1

x <- read.fwf(file = "c:\\whatever\\data.txt", width=c(1,1,1,1,1,1,1,1,1,1))

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Answer 2

If the data is in a text file and the file contains only data like shown, then the best approach is probably the read.fwf approach as described by @Penguin_Knight. But if there are additional data fields in the file that don't fit the fixed width format, or if the data has been copied or grabbed in a different way so that it is already in a character vector in R, then here are some other options.

You can still use the read.fwf approach with a textConnection .

You can use the strsplit function to split the strings into the individual digits and use as.numeric to convert them to numbers.

You can use the strapply function from the gsubfn package to match individual digits and extract them (and pass to as.numeric again).