similar to: Quiz: How to get a "named column" from a data frame

Hi, I am thinking about how to best design a quiz site in RoR. I think it should be fairly easy, but have run into a wall. In the simplest form, the view would grab all of the questions for a particular quiz and display them (e.g. multiple choice, so 4 option buttons per question). However, I can''t figure out how to "mark" the quiz. The form is submitted to the

Hey, I just put up a little rails pop-quiz on my blog (more fun than just writing a post saying "hey did you know..."). Seeing as it''s probably of interest to more than just the three people (including my wife) that actually read my blog I figured it would be okay to announce it here. http://tinyurl.com/prxdl I''ll post my answers in a followup tomorrow

I suppose everybody who makes a package for the first time thinks "I can change anything!" and then runs into this same question. Has anybody written out information on how a package can override functions in R base in the R 2.14 (mandatory NAMESPACE era)? Suppose I want to alphabetize variables in a summary.data.frame, or return the standard deviation with the mean in summary output.

Hi, I really feel I've looked everywhere, although I know this can't be a hard problem. I'd like to be able to call the graph below as a function, but I can't get the function to recognize variables beyond 'dframe'. I've read through many papers on writing functions in R, but I can't get this to work. data <- data.frame('date' = as.Date(rep(c(15101,

I'm simulating a Markov process using a vector of proportions. Each value in the vector represents the proportion of the population who are in a particular state (so the vector sums to 1). I have a square matrix of transition probabilities, and for each tick of the Markov clock the vector is multiplied by the transition matrix. To illustrate the sort of thing I mean: pm <-

As I have mentioned before on this list, I am the network Admin for a k12 public school district. We have migrated to samba, in order to save money, and we love it. We have a situation though, where managing a program under samba, vs. Novell is a bit harder, and I want some suggestions on how to handle it. The program is Accelerated Reader, which is a program where students take quizes, and

When nvc0_push_vbo calls nouveau_scratch_done it does not mean scratch buffers can be freed immediately. It means "when hardware advances to this place in the command stream the scratch buffers can be freed". The bug existed for a very long time. Nobody noticed, because "scratch runout" code path is rarely executed. Fixes "Serious Sam 3" on nve7/gk107. ---

Hi, I am trying to speed up part of an algorithm in which certain columns of a large matrix (X) are replaced by the element-wise product of a matrix (M) and a vector (v). In R, the code might be X[, ind] <- M * v I have written a small C routine to do this for me, but the timing depends on how I define the storage.mode of the objects in R and the data types in C, in a way which I don't

Hello, I am hoping for some advice regarding warning/error messages I received when running a Cox regression # message 1 - obtained while creating a plot of residuals > plot (NV.zph, main = "groupNUSM - UNFIT", var= 'groupNUSM') Warning messages: 1: In approx(xx, xtime, seq(min(xx), max(xx), length.out = 17)[2 * : collapsing to unique 'x' values 2: In

Another alternative could be: ORE.emitMissed(DEBUG_TYPE, ...) << ... Then the first line of emitMissed does a check if it is enabled and if not then returns a dummy stream that does nothing for operator<< (and short-circuits all the stream operations) On Sep 15, 2017 2:21 PM, "Adam Nemet via llvm-dev" <llvm-dev at lists.llvm.org> wrote: For better readability we

Dear rsync developers, rsync 2.6.9 appears to have a problem syncing files that contain '::' in their filename. I ran into this set of errors recently: [jneil-pc:fermi1/hw/fermi1_gf100][162]> /home/utils/rsync-2.6.9/bin/ rsync -ah -z --rsh=/bin/rsh --rsync-path='/usr/bin/env -i /home/utils/ rsync-2.6.9/bin/rsync' --exclude='/cygwin/cygwin-*/' sunfire7:/home/

(sorry if this is a duplicate-problems with posting at my end) ---- Hello all, I need some help with a nice R-idiomatic and efficient solution to a small problem. Essentially, I am trying to eliminate randomly half of the entries in a vector that contains index values into some other vectors. More details: I am working with two strings/vectors of 0s and 1s. These will contain about 200

> On Sep 16, 2017, at 4:49 PM, Sean Silva <chisophugis at gmail.com> wrote: > > Actually maybe something like: > > if (auto &E = ORE.emitMissed(DEBUG_TYPE)) { > E.emit(...) << ...; > } Well, the point of this interface was exactly to avoid writing a conditional. If you’re willing to use a conditional you can already write this: if

hey, µ i have these records in my database, in a many-to-many relationship clients_users 1;66 2;66 3;66 5;66 6;66 7;66 8;66 14;66 15;66 16;66 17;66 18;66 19;66 20;66 21;66 22;66 clients 1;VME Complex Foster 2;VME Res. Canada 3;Twodecode 5;Index 6;Verleye bvba 7;Venus bvba 8;All Building Services nv 14;Vitro-Service sa 15;Vitro-Clean 16;Vecom nv 17;Ultra lean bvba 18;Solar Cleaning Services nv

Sean, hopefully you’re OK with that reasoning. I went ahead and committed this in r313691. > On Sep 16, 2017, at 10:43 PM, Adam Nemet <anemet at apple.com> wrote: > > >> On Sep 16, 2017, at 4:49 PM, Sean Silva <chisophugis at gmail.com <mailto:chisophugis at gmail.com>> wrote: >> >> Actually maybe something like: >> >> if (auto &E

Hi all,I would like to draw a simple circle where the color gradient follows the rule color = 1/(r^2) where r is the distance from the circle. I would also like to add a color bar with values going from -40 to -110 (and associate those with the color gradient that fills the circle). So far I experiemented with draw circle

I am new to rails framewrok ,i have experience in PHP and LInux background.I am looking for some tutorial or famous app to create a Quiz and chat .I have implemented quiz and flat file and db based quiz in PHP,but i wanted to do it in Rila.Looking forward for community help. . . -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group.

Following patch introduces a KVM guest balloon driver. Communication to/from the host is performed via virtio. Next patch implements the QEMU driver and handling. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Index: linux-2.6-nv/drivers/virtio/Kconfig =================================================================== --- linux-2.6-nv.orig/drivers/virtio/Kconfig +++

Following patch introduces a KVM guest balloon driver. Communication to/from the host is performed via virtio. Next patch implements the QEMU driver and handling. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Index: linux-2.6-nv/drivers/virtio/Kconfig =================================================================== --- linux-2.6-nv.orig/drivers/virtio/Kconfig +++

Hi, I'm trying to do PCA on a n by p wide matrix (n < p), and I'd like to get more principal components than there are rows. However, svd() only returns a V matrix of with n columns (instead of p) unless the argument nv=p is set (prcomp calls svd without setting it). Moreover, the eigenvalues returned are always min(n, p) instead of p, even if nv is set: > x <-