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I have a loop over readLines(URL[i]) which works fine until it hits a bad URL (e.g., a URL that returns a 404 Error). How can I handle this with a test for this error condition. I read...

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Below is R code that successfully reads the first line of a JSON file (attached). However, it is supposed to read 5 lines of the file, not just one. What is the wrong? ==================== >library("rjson") >json_file <- "/Users/smcintyremobile/Google...

Hi all, I have been attempting to access the source code for the keyword ?function? to better understand how it assigns and stores logical inputs, like in the subset() [base] function. Does anyone know how I can access the source...

Hi UserRs, I know that there has to be an easy way to do this in R (probably easy enough that once someone clues me in I'll smack myself on the forehead for not figuring it out myself), but...

yes, that does it. thanks! --- Thomas Lumley <tlumley at u.washington.edu> wrote: > On Thu, 11 Aug 2005, shelby berkowitz wrote: > > > Hi UserRs, > > > > I know that there has to be an easy way to do this > in > > R (probably easy...

I have been working for 12 hours now on trying to fix my cox model. I have a large data set (n>300) and In my model I have time in months, status (1=dead), and change represents my variable...

Hello Jiefei, Missed this in the subsequent emails. That is a very intriguing article, but I do not believe that it quite answers my question. Regardless, I will review it, so thank you for sending it my way! Respectfully, Shelby...

Afternoon, David, Thank you for your suggestions and insight. I have previously utilized parse, but in my exploration to improve my coding technique I came across this comment in stackoverflow.com (https://stackoverflow.com/questions/1743698/evaluate-expression-given-as...

Thank you all for your reply. I should clarify, that I am looking to understand why the keyword function can take a logical argument (eg: x<4) and use that later inside the function's definition for logical evaluations. Consider...

Afternoon, Peter, Thank you for your concise but informative reply, and for a link to the source code. These complex concepts do answer my question spot on, so thank you for taking the time to put them all together and...

I have also recently come across a conversion program that works with ghostscript to convert ps and pdf images into other vector formats, including .wmf and .emf for M$ software: http://www.pstoedit.net/. This might be helpful if your...

Wow, this is great! Thank you, Richard, for going so in-depth with this explanation. My ultimate goal is to create a vector that stores logical evaluations to be used later in a function that subsets data. I?ve coded...

Hi,I have tumor growth curve data for a bunch of different mice in various groups. I want to compare the growth curves of the different groups to see if timing of drug delivery changed tumor growth.I am trying...

Hello Bert, Thank you for the reply and your clarifications. Yes, it might be helpful to look into R?s formal grammar to see how ?function? parses input to delegate correct syntax. Is that accessible online? Thank you, Shelby From...

So do i need to resend?the email to someone else? sorry i am just confused On Saturday, March 26, 2016 9:21 AM, John Kane <jrkrideau at inbox.com> wrote: It would be helpful if you actually supplied your...

Beautiful!!! Thanks so much, Uwe! [Notes for anyone else stumbling across similar issues in the future: After making the change Uwe suggested, I realized a couple of things: first, the plot.new() commands were redundant with add=F in place...

Dear R gurus, I'm running into a problem with some modified segment plots I've coded using stars(). What I am trying to do is superimpose two series of data along with radial axes markers in a 2x2 graphics...