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Hi has anyone coded up Donald Knuth's algorithm X for solving the exact cover problem? -- Robin Hankin Uncertainty Analyst National Oceanography Centre, Southampton European Way, Southampton SO14 3ZH, UK tel 023-8059-7743

Hi anyone coded up Stirling numbers in R? [I need unsigned Stirling numbers of the first kind] cheers Robin -- Robin Hankin Uncertainty Analyst National Oceanography Centre, Southampton European Way, Southampton SO14 3ZH, UK tel 023-8059-7743

many very helpful people wrote: >do.call("rbind", list) Thank you very much everybody. I wondered what the deal was WRT do.call(). Could we add this or a similarly educational example to the help(do.call) page? rksh

Dear List I have just uploaded a new package, "onion", to CRAN. It provides some functionality for manipulating and visualizing quaternions and octonions. All comments welcome! enjoy rksh -- Robin Hankin Uncertainty Analyst National Oceanography Centre, Southampton European Way, Southampton SO14...

Hello everyone before I reinvent the wheel, has anyone out there coded up the gamma() function for complex arguments? -- Robin Hankin Uncertainty Analyst Southampton Oceanography Centre SO14 3ZH tel +44(0)23-8059-7743 initialDOTsurname at soc.soton.ac.uk...

Hi If string <- "xyz" f <- function(x){1 + sin(cos(x)) + exp(x^2)} How do I manipulate "string" and f() to give the string "1 + sin(cos(xyz)) + exp(xyz^2)" ? -- Robin Hankin Uncertainty Analyst National Oceanography Centre, Southampton...

Hi I have a little powerPC G4 powerbook, running macosx10.5.8. I don't think XCode 3.2.1 will work for me. What are my options? thanks in advance Robin -- Robin K. S. Hankin Uncertainty Analyst University of...

Hi before I reinvent the wheel, has anyone coded up the Lerch Phi function? [ The Lerch Phi function is defined as phi(a,s,b) = \sum_{k=1}^\infty\frac{a^k}{(b+k)^s} ] -- Robin Hankin Uncertainty Analyst National...

Hi has anyone coded up integer factorization? I want, for example, R> factorize(60) $primes [1] 2 3 5 $powers [1] 2 1 1 (actually, I want the divisor function $\sigma_a(n)$, but coding this up requires integer factorization...

Hi I recently uploaded package "elliptic" to CRAN. From the DESCRIPTION file, it is: A suite of elliptic and related functions including Weierstrass and Jacobi forms. Also includes various tools for manipulating and visualizing complex functions. enjoy rksh -- Robin Hankin...

Hi I have a bundle comprising three packages. Each package has a vignette. Currently each vignette has a separate .bib file. How do I arrange the bundle so that each vignette accesses a single, common, .bib file? thanks Robin -- Robin...

Hello everybody. I've been experimenting with mapply(). Does anyone else have problems with: R> mapply(rep,times=1:4, MoreArgs=42) (I get a seg fault). robin R> R.version _ platform powerpc-apple-darwin6.6 arch powerpc os darwin6...

Hi just now I had an apparently insurmountable problem that's been bugging me for days, but phrasing my question in a form suitable for the R-help list enabled me to solve my own problem in two minutes flat...

Hi I found the following unexpected: > integrate(function(x){0*x+1+1i},0,1) 1 with absolute error < 1.1e-14 > One can write a little wrapper, but it's messy. Would it be hard to accommodate such functions...

Dear list, The new package 'multivator' is now available on CRAN. This presents a multivariate generalization of the emulator package. The corresponding JSS article is: Robin K. S. Hankin (2012), "Introducing multivator: A Multivariate Emulator", Journal of Statistical Software, 46...