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Inline. Bert Gunter "The trouble with having an open mind is that people keep coming along and sticking things into it." -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip ) On Wed, Oct 14, 2020 at 3:23 PM 1/k^c <kchamberln at gmail.com> wrote: Is which() invoking c-level code by chance, making it slightly faster > on average? > You do not need to ask such questions. R is open source, so just look! > which function (x, arr.ind = FALSE, useNames = TRUE) { wh <- .Internal(which(x)) ## C code...

...'s considered best practice to keep it. What is R inoking when which() isn't called explicitly? Is R invoking which() eventually anyway? Cheers! Keith > Message: 2 > Date: Mon, 12 Oct 2020 13:01:36 -0600 > From: Greg Snow <538280 at gmail.com> > To: "1/k^c" <kchamberln at gmail.com> > Cc: r-help <r-help at r-project.org> > Subject: Re: [R] which() vs. just logical selection in df > Message-ID: > <CAFEqCdyUuHh5TZ7t5NJ8cs_4xB61mNeUgasncekD485eBNRK6Q at mail.gmail.com> > Content-Type: text/plain; charset="utf-8" > &...

Hi R-helpers, Does anyone know why adding which() makes the select call more efficient than just using logical selection in a dataframe? Doesn't which() technically add another conversion/function call on top of the logical selection? Here is a reproducible example with a slight difference in timing. # Surrogate data - the timing here isn't interesting urltext <-

Hi, is there a way to take a dataset and extract numeric columns and create interaction columns from it automatically? For e.g. there are 5 columns of data: A,B,C,D,E. CDE are numeric. Can someone provide code to automatically create more columns such as: 1) C*D, C*E, C*D*E, (C+E)/(D+.01 (to avoid divide by zero), (D+E)/(C+.01 (to avoid divide by zero), (C+D)/(E+.01 (to avoid

Hello, I am trying to learn how to perform Multiple Regression Analysis in R. I decided to take a simple example given in this PDF: http://www.utdallas.edu/~herve/abdi-prc-pretty.pdf I created a small CSV called, students.csv that contains the following data: s1 14 4 1 s2 23 4 2 s3 30 7 2 s4 50 7 4 s5 39 10 3 s6 67 10 6 Col headers: Student id, Memory span(Y), age(X1), speech rate(X2) Now

...raduate Student: Computational Systems Biology | Memorial Sloan-Kettering Cancer Center | Weill Medical College of Cornell University Contact Info: http://cbio.mskcc.org/~lianos/contact ------------------------------ Message: 114 Date: Tue, 4 May 2010 22:01:37 -0600 From: "kMan" <kchamberln at gmail.com> To: "'someone'" <vonhoffen at t-online.de> Cc: r-help at r-project.org Subject: Re: [R] Delete rows with duplicate field... Message-ID: <01d701caec07$aab81f40$00285dc0$@gmail.com> Content-Type: text/plain; charset="us-ascii" Dear someone, J...

Dear list, There is a new rwiki (http://rwiki.sciviews.org) section for 'large scale data' at http://rwiki.sciviews.org/doku.php?id=large_scale_data. This is a massive topic of interest to many. I could use some help filling in the content so that this can develop into a powerful resource for the r-community. I hope you like it, and I hope you are willing to help make it better.