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Dear R list, I have one very elementary question regrading correlation between two variables. x = c(44,46,46,47,45,43,45,44) y = c(44,43,41,41,46,48,44,43) > cov(x, y) [1] -2.428571 However, if I try to calculate the covariance using the formula as covariance = sum((x-mean(x))*(y-mean(y)))/8       # no of of paired obs. = 8 or     covariance = sum(x*y)/8-(mean(x)*mean(y)) gives

...second, i.e. from L (as above) I would want to extract: V1 = c("A1","A2","A3",...) V2 = c("B1","B2","B3",...) Suggestions? With thanks, Ted. ------------------------------------------------- E-Mail: (Ted Harding) <Ted.Harding at wlandres.net> Date: 25-Apr-2013 Time: 11:16:46 This message was sent by XFMail

...at the beginning of each continuation line? (The above is one of the smaller examples of this situation; sometimes I have wished to do this for commands extending over, say, 15-20 lines). With thanks, Ted. ------------------------------------------------- E-Mail: (Ted Harding) <Ted.Harding at wlandres.net> Date: 30-Jul-2012 Time: 09:58:02 This message was sent by XFMail

many languages have shorthands for that operation like: variable += 1 or ++variable is there something like that in R ? -- View this message in context: http://r.789695.n4.nabble.com/increase-or-decrease-variable-by-1-tp3076390p3076390.html Sent from the R help mailing list archive at Nabble.com.

Just to avoid possible confusion, let me correct a typo (at step [2] in the example below). Apologies! -----FW: <XFMail.111023084327.ted.harding at wlandres.net>----- Date: Sun, 23 Oct 2011 08:43:27 +0100 (BST) Sender: r-help-bounces at r-project.org From: (Ted Harding) <ted.harding at wlandres.net> To: r-help at r-project.org Subject: Re: [R] symmetric matrix multiplication On 23-Oct-11 07:00:07, Daniel Nordlund wrote: >> -----Origina...

Hi Ted, yes this was the problem. Thank you very much. best idaios On Wed, Jan 9, 2013 at 4:51 PM, Ted Harding <Ted.Harding@wlandres.net>wrote: > Ah! You have aqssigned a parameter "equal.var=TRUE", and "equal.var" > is not a listed paramater for t.test() -- see ?t.test : > > t.test(x, y = NULL, > alternative = c("two.sided", "less", "greater"), >...

...en be stored after quitting edit.data(). Is there a possibility of a read-only option? Or some other function which could offer similar viewing capability without the risk of data change? With thanks, Ted. ------------------------------------------------- E-Mail: (Ted Harding) <Ted.Harding at wlandres.net> Date: 26-Mar-2013 Time: 10:08:58 This message was sent by XFMail

...http://finzi.psych.upenn.edu/Rhelp10/2010-May/240162.html which uses a somewhat rebarbative parsing of the call stack. Is there a simpler way? Or should I just use the 4-argument method? With thanks, Ted. ------------------------------------------------- E-Mail: (Ted Harding) <Ted.Harding at wlandres.net> Date: 25-Feb-2012 Time: 19:53:49 This message was sent by XFMail

Hi all, why factorial(150) shows the error out of range in 'gammafn'? I have to calculate the number of subset formed by 150 samples taking 10 at a time. How is this possible? best [[alternative HTML version deleted]]

Dear All,   I have a questions I would like to ask about and wonder if you have any thoughts to make it work in R.   1. I work in the field of medicine where physiologic variables are often simulated, and they can not have negative values. Most often the assumption is made to simulate this parameters with a normal distribution but in the "log-domain" to avoid from negative values to be

...rom R where I have used these colours, it seems that for: "salmon": 0.9804 0.5020 0.4471 rgb "orange1": 1 0.6471 0 rgb However, this is a tedious way of finding out! With thanks, Ted. ------------------------------------------------- E-Mail: (Ted Harding) <Ted.Harding at wlandres.net> Date: 10-Jul-2012 Time: 14:05:15 This message was sent by XFMail

...e R package that can solve this kind of problem already, without you having to think much, then its use is illegitimate! (I.e. will be deemed "regurgitation"). Over to you. With best wishes, Ted. ------------------------------------------------- E-Mail: (Ted Harding) <Ted.Harding at wlandres.net> Date: 13-Apr-2012 Time: 22:33:43 This message was sent by XFMail

Dear All, I assume this is an R-devel issue, apologies if I missed something obvious. I have a dataframe where the row names are country codes, based on ISO 3166, something like this: ------------ "v1" "v2" "UK" 1 2 "NA" 2 3 ------------ It happens that "NA" is the country code for "Namibia", and that creates problems on

...s=c(2,3)) Or, even more general, like: marg.apply(X,Y,Z,fun1=f,fun2=sum,margins=c(2,3)) (Such a question must have been asked before, but I haven't located it). With thanks, Ted. -------------------------------------------------------------------- E-Mail: (Ted Harding) <ted.harding at wlandres.net> Fax-to-email: +44 (0)870 094 0861 Date: 13-Nov-10 Time: 15:49:22 ------------------------------ XFMail ------------------------------

...(with optional "tol=" argument) would test for equality to within tolerance, and return a vector of TRUE/FALSE according to the values in X. Or, indeed, perhaps I am overlooking something. Ted. ------------------------------------------------- E-Mail: (Ted Harding) <Ted.Harding at wlandres.net> Date: 01-Sep-2012 Time: 14:48:01 This message was sent by XFMail

...way to change the size of the "buffer" so that one can scroll all the way back to the very first row of Chunk 1? (The size-change may perhaps have to be determined empirically). With thanks, Ted. ------------------------------------------------- E-Mail: (Ted Harding) <Ted.Harding at wlandres.net> Date: 01-Apr-2013 Time: 21:37:17 This message was sent by XFMail

Hello, I have done a scatterplot and now would like to add its regression line but it does not show. Below, the code I have used. lm3 <- lm(data$S_pH_KCl2.5_BCx~data$B_OleicoPF_BCx_per) plot(data$S_pH_KCl2.5_BCx, data$B_OleicoPF_BCx_per) abline(lm3) I have been able to do the complete operation using the software STATISTICA but it would be great to do it with R. If you require more details

...l: sw <- .C(R_swilk, ... ) my modifiction of shapiro.test() doesn't find it? (No doubt there is some dumb oversight behind this, but I'd be grateful to be told what it is)! With thanks, Ted. ------------------------------------------------- E-Mail: (Ted Harding) <Ted.Harding at wlandres.net> Date: 04-Apr-2012 Time: 23:06:32 This message was sent by XFMail

...e la Tour > Montr?al, Qu?bec H3T 1J4 > CANADA > > T?l.: (00-1) 514-343-6607 / Fax: (00-1) 514-343-5700 > lafaye at dms.umontreal.ca > http://www.biostatisticien.eu > -------------------------------------------------------------------- E-Mail: (Ted Harding) <ted.harding at wlandres.net> Fax-to-email: +44 (0)870 094 0861 Date: 13-Nov-11 Time: 17:23:07 ------------------------------ XFMail ------------------------------

Greetings I want to remove numbers from a string of characters that identify sites so that I can merge two data frames. For example, a site in one frame is called "001a Frozen Niagara Entrance" whereas the same site in the other data frame is called "Frozen Niagara Entrance". It seems to me the easiest thing to do would be to remove the numbers from the first data