similar to: Inheritance Question

Hi everyone, I have 3 types of people (for now): Staff Faculty Students To break them up into classes, but keep them in the same People table, I''ve broken them up like so (code and ''ends'' snipped): class Person < ActiveRecord::Base class Employee < Person class Staff < Employee class Faculty < Employee class Student < Employee So, when I insert

Struggling a little with getting the syntax right for a STI model. Prob just being a bit dense. Couple of questions I''m hoping you guys can answer: Assume here I''ve got: class Person class Manager < Person class Slave < Person 1) How does person[:type] differ from person.type when type is the column used to specify the subclass. They seem to output the same

So, RoR is better at grammer than I. Well so is my nine year old. If I have a table named "people_type" will Rails see this as singular because of the _type or will it consider it the plural of "person_type" ? Is there a link to Rails that lists what words it knows, or what words not to use in table design etc. Kindest regards. -- Posted via http://www.ruby-forum.com/.

Hello all! I have a data frame with nine variables and 293 cases. (attached goes the csv file). I need to calculate a index using the sum of one variable (N) divided by the length of other variable (Fisherman), but for each day (Date). I tried to use that codes: by (cpue, cpue$Date, function (x) sum (cpue$N)/length(cpue$Fisherman)) tapply (cpue$Data, cpue$Data, function (x) {sum

I've been unable to find a R package that provides the means of performing Clarke & Ainsworth's BIO-ENV procedure or something comparable. Briefly, they describe a method for comparing two separate sample ordinations, one from species data and the second from environmental data. The analysis includes selection of the 'best' subset of environmental variables for explaining

Sorry about the dumb question: Are the "BUILTIN\Administrators" and "BUILTIN\Users" local (nested) groups supposed to be populated with DOMAINNAME\Domain Administrators and DOMAINNAME\Domain Users (respectively) by default? If I download the Redhat Samba package, they are populated. Not so with a compiled version. I've had a helluva time populating BUILTIN\Administrators

Hi Zhongxing, On 4/8/07, Zhongxing Xu <xuzhongxing at gmail.com> wrote: > I think the real difficult thing in path sensitive program analysis (or > symbolic execution) is not the lack of decision procedures, but the > translation of arbitrary pointer operations and library function calls in > C/C++ program into the mathematics supported by the automated theorem > prover. >

i'm trying to build a little summary table for the contents of a data frame. t<-sapply(macro, data.class) c<-sapply(macro, length) m<-sapply(macro, mean, na.rm=T, digits=2) cbind(type=t, n=c , mean=m) I want to drop the variables that are factors so I can include -max- and -min- in my table. -macro- contacts the data--how do I drop the variables according to their data.class

Dear LLVMers, This email is intended for those interested in path-sensitive analysis, integer overflow analysis, static analysis, and (perhaps) loop invariant computation. Traditionally, such analyses have been considered too expensive to be practical, and were mostly an academic curiosity. The core of the problem is the lack of adequate automated decision procedures which could quickly

On 4/9/07, Domagoj Babic <babic.domagoj at gmail.com> wrote: > > > Traditionally, such analyses have been considered too expensive to be > practical, and were mostly an academic curiosity. The core of the > problem is the lack of adequate automated decision procedures which > could quickly determine whether a set of constraints is satisfiable or > not, and if it is

> > Spear takes a different approach - it is bit-precise, handles all > operators, but > currently doesn't handle arrays directly. However, the other mentioned > thm provers > handle arrays by encoding them as UIFs + several axioms. As UIFs can be > encoded > to SAT, I think that the theory of arrays could be as well. So, with a > bit of effort, > you should be

Jw, Thank you so much for your reply. The commandline: rsync -avH --rsh=/usr/bin/ssh /www/kunder/web/ MYHOST:/www/kunder/web Solved all of my problems, and I'm now much closer to completing a servermove. I however have one last question. When enetring the above command, I'm asked to type the SSH password to start the transferr. Is there any way to include this in the above mentioned

I am trying to figure out if a SSD drive needs to receive trim commands from the KVM guest filesystem(strictly Linux ext4 in this case).... When a file is deleted inside a KVM guest(ext4 and raw image)....If a SSD is the underlying block device that the KVM raw disk image resides on, does the SDD drive need to know which block(s) are marked for reuse within the raw image? ?Or is it since the

This is a lil bit off topic, but I thought I would bring it up, since we have users that are trying to run windows BOINC under wine. The wine project has a SETI@Home team (has had for some time), so if you run the windows or linux BOINC/SETI@Home client, you can join our team and apply your credits towards the project's total. Just go to

Hi, I have not esatblished a working rsync config on my server, but have found one major problem in which i hope there is a solution to. I'm based in Norway, with scandinavian clients. Of course we use several "special characters" in our keymap, which is not supported in US keyboards etc. I know there is a better word for this, unfortunatly i can't remeber it, so i hope you

Ok. It's a Firefox Add-on: https://www.eff.org/https-everywhere Questions: 1) But: Why can't i find it on the offical Firefox Add-ons site?: https://addons.mozilla.org/en-US/firefox/ 2) Did anyone audited the "HTTPS Everywhere" code? 3) Can someone trust this Add-on? Is it safe to install/use? 4) If it's so great why isn't it more prevalent? What's youre

Hello all, I'm having troubles getting R to load data from GRASS 7. I suspect I have installed something wrong, but can't figure out what. Any suggestions for what I could look for or how to trouble shoot this? Thanks in advance for any help! After having other issues last week, we have upgraded Debian to the testing version. The other problems are solved, but now I can't get

Dear everyone, I am new in R and I've got difficulties in realizing the following tasks: -I have variables (factors) with different numbers of levels, either 1, 2 or 3. -I have a matrix containing these 204 factors and I have to correlate them by groups of 4 variables. -I have to delete the factors just having one level ( because when correlating one-level factors, the output is NA) here

Ive tried very hard to get Half-Life to run on my Linux box...and I have finally managed to get it to work...the problem (the BIG problem) was that I was trying to use an installed version of windows as the basis of wine. It worked fine with most programs...but not Half-Life and some other games... My recommendation is that you dont use a preinstalled version of windows as the basis of a wine

> Background: > OS: Linux Ubuntu Dapper > release: R 2.3.0 > editor: GNU Emacs 21.4.1 > front-end: ESS 5.2.3 > ----------------------------- > Colleagues > I have two spatial datasets (latitude, longitude, fish eggs) and (latitude, longitude, fish larvae) at the same 280 stations (i.e. 280 cases). I want to determine if the 2 datasets are spatially correlated. In other