similar to: Bug in my code (finding nonzero min)

I''m a total Rails newbie and i''ve been struggling for hours today with one (prolly very silly) problem: I have a table portfolios that has many images: class Portfolio < ActiveRecord::Base has_many :images end class Image < ActiveRecord::Base belongs_to :portfolios end In the controller i define a list of active portfolios: @active_portfolios =

Hello, In trying to minimize the margin on the left hand side when using dotchart I found what may be a typo in the code. In the lines below from dotchart.R, should nmai[4L] be nmai[2L]? if (!(is.null(labels) && is.null(glabels))) { nmai <- par("mai") nmai[2L] <- nmai[4L] + max(linch + goffset, ginch) + 0.1 par(mai = nmai) } Thank you, Stephen Weigand --

Hello, I hope all is well. I've gone through and searched just about all the manuals, faqs, contribs available on the data import/export process and have not found any answer to a specific question. Hopefully, I will be able to fall back upon the valuable expertise in mailing list. Here goes: How can I import SPECIFIC columns of data in a fixed width file? E.g. I have a fwf with 40

Hello, I hope all is well. I've gone through and searched just about all the manuals, faqs, contribs available on the data import/export process and have not found any answer to a specific question. Hopefully, I will be able to fall back upon the valuable expertise in mailing list. Here goes: How can I import SPECIFIC columns of data in a fixed width file? E.g. I have a fwf with 40

Hi everyone! I have a data frame with 1112 time series and I am going to randomly sampling r samples for z times to compose different portfolio size(r securities portfolio). As for r=2 and z=10000,that's: z=10000 A=seq(1:1112) x1=sample(A,z,replace =TRUE) x2=sample(A,z,replace =TRUE) M=cbind(x1,x2) # combination of 2 series Because in a portfolio with x1[i]=x2[i],(i=1,2,...,10000) means a 1

I love the new tiff(), jpeg(), and png() in R 2.7.0 but found an issue that I didn't see reported. When specifying 'units = "in"' but forgetting to change the default height and width (so the figure is unintentionally going to be 480 inches by 480 inches) I run into problems. Here's the reproducible example: tiff("a.tiff", units = "in", res = 1200,

The following example in ?dump.frames options(error = quote({dump.frames(to.file = TRUE); q()})) is useful for teaching the user how to save a frame dump when R encounters an error during non-interactive sessions. This command however causes an additional change that on encountering an error R exits with a 0 error status. Although it's just an example, it's an important one as it's

Hi, I need some help with Portfolio Optimization problem. I am trying to find the minimum variance portfolio subjected to constraints on weights like /x1< w1 <x2 x3< w2 <x4</i> I need help with solving for the minimum variance portfolio as solve.QP doesn't allow me to specify the lower boundaries. Thanks Mahesh -- View this message in context:

guRus Is there a way by which I can search for a particular function or a particular line of code within the maze of all the R codes that are interlinked? Say for instance I am running a code using quantstrat package and on a particular line I get the error saying x is missing in is.array(x). I want to figure out where is.array is in all the codes that my code refers to? How do I do this? Is

This is useful for probing probing for cache files such as: external_command ?ignore_error:(Some true) ~prog "ls .cache/something.*" will return command output (matched files) on its success or empty list whenits exit code is other than 0 (there are no such files). --- mllib/common_utils.ml | 15 ++++++++++----- mllib/common_utils.mli | 2 +- 2 files changed, 11 insertions(+), 6

Hi, Is there a function func(x) where x is an array such that it returns a list of the indices of all non-zero elements of the array? for example: a: 1 0 0 0 0 1 0 1 0 func(a) returns two vectors r and c: r c 1 1 2 3 3 2 daver +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |David Richmond It works on a | + Dept. of Sociology complex scientific

[my original message to s-news & r-help is attached ] No one possessed or knew of any S/R code for the sequential t-test. Also it doesn't appear in the SAS index. One or two suggested obtaining the S+ seqtrial software which may (or may not) cover this, but this seemed to be a bit of a "hammer to crack a nut". I have written a function based on the treatment in Wetheril

I've only been using R on and off for 9 months and started using the glasso package for sparse covariance estimation. I know the concept is to shrink some of the elements of the covariance matrix to zero. However, say I have a dataset that I know has some underlying "baseline" covariance/correlation (say, a value of 0.3), how can I change or incorporate that into to the

At the risk of ridicule for my deficient linear algebra skills, I ask for help using the solve.QP function to do portfolio optimization. I am trying to following a textbook example and need help converting the problem into the format required by solve.QP. Below is my sample code if anyone is willing to go through it. This problem will not solve because it is not set up properly. I hope I

Hi, I''ve got a live_search field in a partial that is on several different pages. On all pages, except 1, it works fine. On the page it doesn''t work on, it seems it never executes it action. Here''s my observe_field code inside the partial: <h1><label for="searchtext">Live Search:</label></h1> <%= text_field_tag :searchtext

Dear All, I am using package fPortfolio to run minimum variance portfolio optimizations in R. I already know how to set portfolioSpecs, portfolio objects and constraints. Unfortunately I am not able to set the following type of constraints. I have a timeSeries object with returns data for roughly 1.5k assets for 261 subperiods (workingdays) and want to compute the global minimum variance

[whit at linuxsvr R.packages]$ sudo R CMD INSTALL portfolio.construction * Installing to library '/usr/local/lib64/R/library' * Installing *source* package 'portfolio.construction' ... ** R ** preparing package for lazy loading Loading required package: fts Loading required package: quadprog Loading required package: Rexcelpoi terminate called after throwing an instance of

Dear sir, I am extremely sorry for messing up the logic asking for help w.r.t. my earlier mails   I have tried to explain below what I am looking for.     I have a database (say, currency_rates) storing datewise currency exchange rates with some base currency XYZ.   currency_rates <- data.frame(date = c("12/31/2010", "12/30/2010", "12/29/2010",

Below I have written out some simplified data from my dataset. My goal is to interpolate Price based on timestamp. Therefore the closer a Price is in time to another price, the more like that price it will be. I want the interpolations for each St and not across St (St is a factor with levels A, B, and C). Unfortunately, I get error messages from code I wrote. In the end only IDs 10 and 14 will

any pointers / suggestions re cheapest Rails hosting where they give you full access to Apache (to load modules etc)??? Can be a shared platform, however not sure if there is a shared platform type hosting service where they do give you such access?