Re: [R] code optimisation problem

Rui Barradas writes: > Hello, > > Package 'compiler' is good at optimizing for loops. Try the following. > Or vectorize the function > system.time(f1(x,10)) user system elapsed 5.010.005.00 > system.time(f1.c(x,10)) user system elapsed 1.920.001.91 > f2 <- func

Re: [R] Help: is there a R Package for L1-regression (not regression with L1-penalty)

"Chee Chen" writes: > Dear All, > Is there a R package for L1-regression (meaning, optimize the sum of > absolute deviations, NOT TO BE UNDERSTOOD as regression with > L1-penalty) ? Yes. > Any information will be appreciated. See http://cran.cnr.berkeley.edu/web/views/Robust.html HTH,

Re: [R] Question on callNextMethod

t; > Produces the output: > > [1] "derived called" > [1] "base called" > [1] "base called" > > > and I was expecting: > > [1] "derived called" > [1] "base called" > > > Thanx in advance, > Simon Knapp > > [[al

Re: [R] summation coding

djbanana writes: > Hi, > > I think I solved it myself by writing loops. > > What I meant is: are there in-built functions in R that calculate the > following: > > a1(b2+...+b190) + a2(b1+b3+...+b190) + ... Following Rainer's setup: x <- data.frame( a = sample( 1:10, 4 ), b = sample( 11:20, 4 )

Re: [R] uniq -c

Sam Steingold writes: > I need an analogue of "uniq -c" for a data frame. The count.rows() function is the R analogue. See http://orgmode.org/worg/org-contrib/babel/examples/Rpackage.html#sec-6-1 No need to install the package - just copy and paste the function into an R session. On cases I

Re: [R] Test for Random Points on a Sphere

e is something in R to meet your needs. A post to r-sig-geo might get more helpful responses once you can focus the question a bit more. HTH, Chuck > Many thanks > > Lorenzo > -- Charles C. BerryDept of Family/Preventive Medicine cberry at ucsd edu

Re: [R] What makes R different from other programming languages?

other programming languages (like Java)? >>> >>> Thanks, >>> -J >>> >>> __ >>> R-help@r-project.org mailing list >>> https://stat.ethz.ch/mailman/listinfo/r-help >>> PLEASE do read th

Re: [R] looking for accessibility help (blind student)

= > > Peter Petto > Lakewood High School Math cell: 440.249.4289 > [[alternative HTML version deleted]] > -- Charles C. BerryDept of Family/Preventive Medicine cberry at ucsd edu UC Sa

Re: [R] Poisson Ridge Regression

start. So is rseek.org where 'poisson ridge regression' gives lots of hits. If you click on 'functions' there is a link to the 'glmnet' package, which is a solid engine for penalized poisson regression. HTH, Chuck -- Charles C. Berry

Re: [R] trouble automating formula edits when log or * are present; update trouble

log(x1) + x2 * x3 >> newFmla[[3]][[2]] > log(x1) >> newFmla[[3]][[2]][[2]] > x1 > > So, if you could tell me of a general way to "walk" though a formula > object, couldn't I use "gsub" or something like that to recognize each > instance of "x1&qu

Re: [R] Generate Dendrogram

to plot.hclust rather than plot.dendrogram. Try plot( dend1, ... ) HTH, Chuck > > Br, > Luffy > -- Charles C. BerryDept of Family/Preventive Medicine cberry at ucsd edu UC San Diego http://famprevmed.ucsd.edu/faculty/cberry

Re: [R] how to cut files from any folder to another folder?

o-cut-files-from-any-folder-to-another-folder-tp4577818p4577818.html > Sent from the R help mailing list archive at Nabble.com. > -- Charles C. Berry Dept of Family/Preventive Medicine cberry at ucsd edu UC San Diego http://famprevmed.ucsd.

Re: [R] working with environments to ensure code quality for long R scripts

__ >> 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. >> >

Re: [R] Looking for the name of a certain kind of quantile plot

t > of any real use in statistical analysis? > > thanks. > Carl -- Charles C. BerryDept of Family/Preventive Medicine cberry at ucsd edu UC San Diego http://famprevmed.ucsd.edu/faculty/cberry/ La Jolla, San Diego 92093-0901 ___

Re: [R] sqrt(-x) vs. -x^0.5

f this line: lapply( as.list( quote(-1-4) ), as.list ) and (thereby) explain why the result of -1-4 isn't 3. HTH, Chuck [rest deleted] -- Charles C. Berry Dept of Family/Preventive Medicine cberry at ucsd edu UC San Diego h

Re: [R] extracting the i-th row of a matrix in a list of lists

'j=TRUE'. Note: all.equal( lapply(lapply(x0, '[[', 3), '[', i=2,j=TRUE), lapply(lapply(x0, '[[', 3), '[', i=2, j=1:2) ) HTH, Chuck > or should I really stick with: > > lapply(lapply(x1, '[[', 3), f

Re: [R] Why does the order of terms in a formula translate into different models/ model matrices?

f design matrices: > qr(X1)$rank ## 9 > > qr(X2)$rank ## 10 > > > Will be very grateful if someone could help me here! > > Thanks, > > Alexandra > > > > > > -- > View this message in context: > http://r.789695.n4.nabble.com/Why-does-the-order-

Re: [R] Need help interpreting the logit regression function

.factor(indep) , family = binomial(link = >>"logit"),na.action = na.pass) > (Intercept) as.factor(indep)3 > -1.0986-0.2877 > > Now, exp(-1.0986) = 0. and exp(-1.0986-0.2877) = 0.25. > > These are nothing like the previous odds halv

Re: [R] Averaging within a range of values

-- > View this message in context: > http://r.789695.n4.nabble.com/Averaging-within-a-range-of-values-tp4291958p4294061.html > Sent from the R help mailing list archive at Nabble.com. > -- Charles C. BerryDept of Family/Preventive Medicine cberry at ucs

Re: [R] Putting an index explicitly into function code --- a curiosity.

is created by bquote(). Replacing eval(e[[2L]], where) by { e[[1L]] <- as.name("force") eval(e) eval(e[[2L]], where) } seems to handle this case without breaking example(bquote). HTH, Chuck > Duncan Murdoch > -- Charles C. Ber

Re: [R] qqnorm & huge datasets

>> [1] 10233     2 >>> plot(qq.slim) >>> >> >> Choose the digits arg in round to be large enough to allow for points that >> do not overlap >> to be seen and small enough to slim down the number of plotted >> points. In the example above, 1

Re: [R] qqnorm & huge datasets

digits arg in round to be large enough to allow for points that do not overlap to be seen and small enough to slim down the number of plotted points. In the example above, 10233 vs 10. HTH, Chuck -- Charles C. Berry Dept of Family/Preventive Medicine cberry at ucsd

Re: [R] column permutation of sparse matrix

pairs are not unique. (e.g. 3.709 is seen in M2, but not M1) I think the OP was asking for permutations of the non-zero values in 'res', rather than permutations of M1@x. HTH, Chuck >> >> I don't have experience with sparse matrices, but I was able to get this >>

Re: [R] fundamental guide to use of numerical optimizers?

generalizations? Are there other tips that > everybody ought to know? > > I understand this is a vague question, perhaps the answers are just in > the folklore. But if somebody has written them out, I would be glad to > know. -- Charles C. Berry Dept of Family/

Re: [R] Multicollinearty in logistic regression models

by ...' and page through the results to find good leads on this topic. HTH, Chuck > >> Thank you in advance >> M >> >> -- >> >> Mohamed Lajnef,IE INSERM U955 eq 15# > > > David Winsemius, MD > West Hartford, CT > -- Charles C. Berry

Re: [R] k-folds cross validation with conditional logistic

> > Terry T > -- Charles C. BerryDept of Family/Preventive Medicine ccberry at ucsd dot edu UC San Diego http://famprevmed.ucsd.edu/faculty/cberry/ La Jolla, San Diego 92093-0901 __ R-help

Re: [R] Maximization Problem

eted]] > -- Charles C. BerryDept of Family/Preventive Medicine cbe...@tajo.ucsd.edu UC San Diego http://famprevmed.ucsd.edu/faculty/cberry/ La Jolla, San Diego 92093-0901 __ R-help@r-project.org