search for: constriant

Hi list: This is my first time to post my question on the list. Thanks for your help. I am solving a quadratic programming using R. Here is my question: w = arg min 0.5*w'Mw - w'N s. t. sum(w) = 1; w>0 note: w is weight vector, each w_i must >=0, and the sum of w =1. Here is my R code: A <-matrix(c(2.26,1.26,1.12,1.12,2.27,1.13,1.12,1.13,2.2),3,3); B <-

Dear R list, I use the constrOptim to maximize a function with four constriants but the answer does not leave from the starting value and there is only one outer iteration. The function is defined as follows: tm<-function(p){ p1<-p[1]; p2<-p[2]; p3<-p[3]; p4<-1-p1-p2-p3; p1*p2*p3*p4} ##the constraints are p1>=0; p2>=0; p3>=0 and p4>=0 i.e. p1+p2+p3...

Function DEoptim in package DEoptim for differential evolution defines an optional parameter fnMap: fnMap "an optional function that will be run after each population is created, but before the population is passed to the objective function. This allows the user to impose integer/cardinality constriants." Unfortunately, there is no further documentation decribing the kind of parameters being passed to this function on invocation or the structure of the return value expected. I would very much appreciate it if somebody familiar with this package could provide an example illustrating how this...

On Feb 23, 2012, at 8:14 AM, David Greene <dag at cray.com> wrote: > I have a set of changes that enhances rematerialization to handle more > kinds of loads, specifically loads with multiple address registers. > This is a big win for some codes on x86. That's great, but I really wish you would discuss the design of these things publicly, and not develop features on

...you could > be wasting a lot of your time. I don't have a choice. I have to get patches approved after I already have them. In this case, I had a week to get the feature done to meet a deadline so there was no time for previous discussion. I really don't like that I'm under these constriants but that's the way it is, unfortunately. >> The change requires that live interval analysis be able to determine >> whether and instruction is a load and whether an instruction writes to >> memory. > > Just use MI->mayLoad(), MI->mayStore(). Does this also accou...

I have a set of changes that enhances rematerialization to handle more kinds of loads, specifically loads with multiple address registers. This is a big win for some codes on x86. I plan to send these up ASAP but I want to solicit a bit of guidance first. The change requires that live interval analysis be able to determine whether and instruction is a load and whether an instruction writes to

I''m trying to generate a "page slug" i.e. a url sanitized id from some text in my model that I want to be saved into the database and I''m not seeing how I can do it. The closest I''ve come to getting this to work has been... class Page < ActiveRecord::Base attr :name before_save :generate_slug def generate_slug self.slug = self.name.gsub

...Subject: Re: [R] (no subject) Message-ID: <AANLkTi=qKpbPZutDNr9n8af1jGFsLfTqT1C7Nm8Ko+[200]oH at mail.gmail.com> Content-Type: text/plain; charset=UTF-8 2010/7/23 w ? <[201]hw_joyce_cn at hotmail.com>: > I use the constrOptim to maximize a function with four constriants but the answer does not leave from the starting value and there is only one outer iteration. The function is defined as follows: > tm<-function(p){ > p1<-p[1]; p2<-p[2]; p3<-p[3]; > p4<-1-p1-p2-p3; > p1*p2*p3*p4} > > ##the co...