Dear Omar, It wasn't clear to me from your original question that you wanted to test that *all* the corresponding entries were equal, as opposed to each individual entry.
In any event, I don't think that you'll find a similar function for testing inequality, so you can do as you suggest, but of course without abs(). Regards, John -------------------------------- John Fox Department of Sociology McMaster University Hamilton, Ontario Canada L8S 4M4 905-525-9140x23604 http://socserv.mcmaster.ca/jfox -------------------------------- > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Omar Lakkis > Sent: Wednesday, May 25, 2005 10:08 AM > To: r-help@stat.math.ethz.ch > Subject: Re: [R] precision problem > > all.equal is helpful when I am comparing equality of two matrices. > However, when I am comparing two individual number with > or > < is my best bet doing if( abs(x - y) < tolerence) or is > there a function like all.equal that has the same default tolerence? > > On 5/25/05, Omar Lakkis <[EMAIL PROTECTED]> wrote: > > Thank you all. > > all.equal is very helpful since I am also interested in finding the > > mismatched prices. > > > > On 5/25/05, John Fox <[EMAIL PROTECTED]> wrote: > > > Dear Omar, > > > > > > Perhaps I'm missing something, but why not just subtract > one matrix > > > from the other and test the difference in relation to the > precision > > > that you require for the comparison? E.g., to test near equality, > > > something like, abs(A - B) < 1e-13. > > > > > > I hope this helps, > > > John > > > > > > -------------------------------- > > > John Fox > > > Department of Sociology > > > McMaster University > > > Hamilton, Ontario > > > Canada L8S 4M4 > > > 905-525-9140x23604 > > > http://socserv.mcmaster.ca/jfox > > > -------------------------------- > > > > > > > -----Original Message----- > > > > From: [EMAIL PROTECTED] > > > > [mailto:[EMAIL PROTECTED] On Behalf Of > Omar Lakkis > > > > Sent: Wednesday, May 25, 2005 9:09 AM > > > > To: r-help@stat.math.ethz.ch > > > > Subject: [R] precision problem > > > > > > > > I have prices that I am finding difficult to compare with ==, > > > > > and >, due to precision. For example: the numbers should > > > > match, with '==', but they differ in the magnitude of > 1e-14 due to > > > > bunch of calculations that I run on them. Programming > with java, I > > > > am used to implementing a function that compares the difference > > > > between the numbers to a pre determined precision factor. This > > > > could be very slow when I have two matrices of numbers that I > > > > could otherwise compare with a simple '==', '>' or '<' in R. > > > > What is teh best solution for this problem? > > > > Can I control the precision of ==, > and < without having to > > > > reimplement the operations in a slow way? > > > > > > > > ______________________________________________ > > > > R-help@stat.math.ethz.ch mailing list > > > > https://stat.ethz.ch/mailman/listinfo/r-help > > > > PLEASE do read the posting guide! > > > > http://www.R-project.org/posting-guide.html > > > > > > > > > > ______________________________________________ > R-help@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html