On Fri, Nov 28, 2008 at 8:35 AM, Heidi Wong <[EMAIL PROTECTED]> wrote: > a. Write a R function zerdiag.v1(m) using loop to output a square matrix > whose diagonal elements are zero and the other elements are filled in by > consecutive integers from 1 to m row-wise. > > For example, > zerdiag.v1(6) = [0, 1, 2] > [3, 0, 4] > [5, 6, 0] > > This function should have error checking ability. If the input m cannot form > a square matrix, then the function will return an error message: "Input > number is incorrect." > > b. Write a R function zerdiag.v2(m) to produce the same output as in part > (a) without using a loop. > > c. Test your functions in part (a) and (b) using m=12 and m=14 respectively. > > I'd appreciate any help with this problem... I've spent a lot of time > staring at it, and I'm still not sure where to start. Thanks! > > [[alternative HTML version deleted]] >
Hi, Nice little brain teaser! Not too difficult, but requires a bit of creative thinking... You might wanna have a look at, for example, ?diag, ?uniroot, or ?polyroot. regards, Gustaf -- Gustaf Rydevik, M.Sci. tel: +46(0)703 051 451 address:Essingetorget 40,112 66 Stockholm, SE skype:gustaf_rydevik ______________________________________________ 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.