similar to: reading large data

Hello, I am having trouble understanding how R is coercing between matrices and lists in the following example. I have an aggregate behavior I like: aggregate(a[,"num"],by=list(product=a[,"product"],region=a[,"region"]), sum) Now in reality I have more columns than just product and region, and need to pick different combinations. So I want to abstract this into a

I would like to know if there is a way to do the following command in one step, primarily for speed on large data (5 million elements), and secondarily for readablity. mean(delta[(intersect(which(x[['class']]==0),which(delta<1)))]) Do I really have to rely on an intersect operator? Isn't that O(nlg(n))? Can't I just filter in one step? As an R newbie, I would have guessed

r-help, The R manual lists two types of memory: transient and user-controlled. If I have transient blocks reachable from the globals only by traversal through user-controlled blocks, will they be correctly preserved? Secondly, what are the ways to mark user controlled blocks as "roots" for the garbage collector, so that transient blocks they reference stay uncollected? So far I

r-help, The R manual lists two types of memory: transient and user-controlled. If I have transient blocks reachable from the globals only by traversal through user-controlled blocks, will they be correctly preserved? Secondly, what are the ways to mark user controlled blocks as "roots" for the garbage collector, so that transient blocks they reference stay uncollected? So far I

I've got a problem I hope someone can help with. We have a directory on a redhat box where we want anyone who creates a file (usually done with samba access) to have that file be created as if by a special "user" and group.. Now in the smb.privateshares config file we specify force user and force group.. However when we create a file in this directory it shows it being owned by the

I'm completely new to R and am trying to install an add-on package for one of our faculty members. I've had no problems with most of them, but am completely stuck trying to figure out why MCMCpack won't install.. any help is VERY much appreciated!!! here's what I get when I try to install the package: * Installing *source* package 'MCMCpack' ... checking for C++ compiler

Have been looking into using rails but am finding the "Composite Primary Keys are Bad" thing a tad disturbing (to put it mildly). I have been working with RDBMS systems for over fifteen years and this is the first time I have herd the idea questioned. I have cone across using surrogate keys which mirror the composite key for performance reasons in VERY big databases but I have never

We are using dbox with lz4 compression and dovecot-lda + sieve for delivery. Mail recieved: Mar 16 06:27:55 mail2 dovecot: lda(svs at example.com): sieve: msgid=<20160316032754.4C89D2C4 at rdbms.oldstable.office.example.com>: stored mail into mailbox 'INBOX' Around 08:14:00 user start his thunderbird with local filters. He found one mail without headers. Around that time user do

Hi folks, I need your opinions on a basic design issue. I''ve seen the light of RoR and have replaced my Perl (DBI/CGI) based web server <-> RDBMS communication with RoR, but I still have a whole host of users (other servers/OS''s etc) out there wanting to talk to my RDBMS and they only talk Perl. Also they don''t want to talk Perl/DBI directly (they are not allowed

We are new to R and evaluating if we can use it for a project we need to do. We have read that R is not well suited to handle very large data sets. Assuming we have the data prepped and stored in an RDBMS (Oracle, Teradata, SQL Server), what can R reasonably handle from a volume perspective? Are there some guidelines on memory/machine sizing based on data volume? We need to be able to handle

Is a RDBMS required for Dovecot to run in small (SOHO) environments? (Does it store indexes to the mail, etc.?) Or is it strictly leveraged for larger-scale environments? I'm asking, because the INSTALL says ./configure and make is enough for most...but as my previous post requested...there isn't anywhere that lists Required Packages/Software. We need to get that out there before 1.0RC

Hello, are there people outside who use R for analysis of wind-measurement data (meteorological or for planning of wind power stations)? Are there already scripts/modules available for analysing and displaying/plotting wind data in the way it is done in projection/planning of wind power stations? If not, would it be of interest to use R for this, and therefore adapt data-logger output to R (by

I am trying to validate an integer field called quantity. I don''t know how to chack if it has gone beyond or below the maximum or minimum value allowed by the Firebird RDBMS. I tired adding this code to the validate method in the model: if (quantity > -2147483648) and (quantity < 2147483648) errors.add("quantity", "is out of range (must be between

This may seem off the wall, but can dovecot be configured to support a connection to a database server and use the database server to store the e-mail message and its attachments? While you can use Postgres and MySQL for storing and authenticating users, there is a possibility to use an RDBMs to control the mail itself. Thoughts? -- Michael Segel Principal MSCC

Hi... I have a strange problem with my Private NIC Channel, here is my environment details : 1. RHAS 2.1 with kernel 2.4.9-e.27 Enterprise 2. OCFS version : 2.4.9-e-enterprise-1.0.9-6 3. Oracle RDBMS : 9.2.0.4 RAC with 5 Nodes 4. Private NIC Channel: Broadcom BCM5700 My Private NIC channel is down intermittently, we just tracing the root of the problems by identify each product installed the

Dear All... I need some information regarding OCFS performance in my Linux Box, herewith is my environment details : 1. We are using RHAS 2.1 with kernel 2.4.9-e.27 Enterprise 2. OCFS version : 2.4.9-e-enterprise-1.0.9-6 3. Oracle RDBMS : 9.2.0.4 RAC with 5 Nodes 4. Storage = EVA 6000 with 8 TB SIZE 5. We have 1 DiskGroup and 51 LUNs configured in EVA6000. My Question is : 1. It takes arround 15

Dear All... I need some information regarding OCFS performance in my Linux Box, herewith is my environment details : 1. We are using RHAS 2.1 with kernel 2.4.9-e.27 Enterprise 2. OCFS version : 2.4.9-e-enterprise-1.0.9-6 3. Oracle RDBMS : 9.2.0.4 RAC with 5 Nodes 4. Storage = EVA 6000 with 8 TB SIZE 5. We have 1 DiskGroup and 51 LUNs configured in EVA6000. My Question is : 1. It takes arround 15

so for relational associations, do i need to actually be using an rdbms like innodb or bdb? or can i get away with myisam and assume that telling ruby how i want the tables related will be good enough (ie, has_one, has many, etc)?

Bootstrap startup - innovative Web 2.0 project management software. Prototype in development. Significant equity. This not a big, venture-backed thing; it''s a work at home, bust your ass, do work you like, make good money (eventually) ? and take down decent money when we sell (hopefully) thing. MS Project is a $1 billion/year product that frustrates most of its users. I believe we can

Hi All, I'm new in Linux... My Office will migrate from Windows to Linux. We're using Mandrake 10. Actually there's no problem migrating office application into Linux, but some of our application that is using firebird cannot instantly migrate to Linux. That's why wine is my hope solution for this. After I install wine-20050830-mdk.i586.rpm almost "exe file" can