search for: coumns

Hello Well I am relatively new so some of these issues may not fall under the subject that I have used. 1. How do I do a Pareto. Following is the approach I took. My data looks like this df2_9 Reaason.for.failure Frequency 1 Phy Conn 1 2 Power failure 3 3 Server software 29 4 Server hardware 2 5 Server out of mem 32

Dear all, Rank of a matrix depends on which factors? Only on rows or coumns? or both ? If there is a collinearlity in the variables ( columns ) does it effects the rank? > X<-matrix((rnorm(10000)),50) > dim(X) [1] 50 200 > qr(X)$rank [1] 50 > X[,2]<-X[,30] > qr(X)$rank [1] 50 > X[10,]<-X[7,] > qr(X)$rank [1] 49 Thanks Alex [[alternati...

How does one properly get find_all to grab the data from the DB table ordered by a specific column? For example: @anglers = Angler.find_all This code gets all the angler records and they are sorted in order of the id field which is of course set as a primary key in the DB (mysql). I''d really like to pull the data from the DB sorted in the order of another field, for example

hi netters, I'm a newbie to R and there are some very simple problems puzzeled me for two days. I've a dataframe here with several columns different in modes. Two of the columns are special for me: column 1 has the mode "factor" and column 2 has the mode "numeric vectors". The values for column 1 are either "T" or "F". I wanna do two things:

I have TableA with name, description, start time displayed on one page. TableB has name, comment, file path and is displayed on another page. I''m using the SortHelper2 helper to help me sort the columns of these tables, however I''m experiencing a problem whereby if I sort TableA by description and then go ahead and view TableB I get an error message saying SQL Command Failed,

I am working a Bibtex database for my school using Rails and I need some idea on how to manage the bibtex types. I crated an Author and Publications model and put has_and_belongs_to_many relationship between them. The user model basically is like this: class User < ActiveRecord::Base has_and_belongs_to_many :publications end The Publication model has all the Bibtex fields