On 2010-07-05 11:30, David Winsemius wrote:
On Jul 5, 2010, at 11:49 AM, Irina wrote:Hello, I am trying to save a large matrix of values in a file. My problem is that I am writing write.table(allpos,'control_chr1.txt', dec=".") and then I want to check it with test2=read.table('control_chr1.txt') sum(test2[,2]==allpos[,2]) This last number is lower than the length of the test2[,2] vector. This is really annoying me because I can't figure out why I don't get out the same thing that I put in.Many potential problems could underly getting FALSE for an "==" test. One might be FAQ 7.31. Another might be encoding or locale issues related to the decimal separator. Why not post a reproducible example?
David's advice is spot-on. (As is Jim's: using save/load is better.) I have no problem replicating your 'problem' with random data, showing once again the futility of using "==" in situations such as this. Try instead: all.equal(test2, allpos, check.attributes = FALSE) (why the check.attributes argument may be needed is left as an exercise) -Peter Ehlers ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
