search for: feng

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2005 Feb 11
1
Help concerning Lasso::l1ce
Hi, First, when I try the example Prostate with bound 0.44 (as in the manual), I got a different result: > l1c.P <- l1ce(lpsa ~ ., Prostate, bound=0.44) > l1c.P .... Coefficients: (Intercept) lcavol lweight age lbph svi 1.0435803 0.4740831 0.1953156 0.0000000 0.0000000 0.3758199 lcp gleason pgg45 0.0000000 0.0000000
2013 Jan 14
2
The three-dot question
...n <- function(a, ...) + { + if(a){ + print(a) + }else + { + print(b) + } + } > > myTask <- function(a) + { + b <- 3 + testFun(a, b = b) + } > myTask(FALSE) Error in print(b) : object 'b' not found Thanks in advance! Feng -- Feng Li Department of Statistics Stockholm University SE-106 91 Stockholm, Sweden http://feng.li/
2007 Jan 18
5
how to get the index of entry with max value in an array?
Hi all: A short question: For example, a=[3,4,6,2,3], obviously the 3rd entry of the array has the maxium value, what I want is index of the maxium value: 3. is there a neat expression to get this index? Thank you! Best, Feng [[alternative HTML version deleted]]
2002 Oct 29
1
Numerical Integration
Hey, all Now I am using EM algorithm to do some optimization. Within that E-step, I have to calculate some multivariate integration given some parameter values Theta and function form of a probability density function f. So I want to know if there are some package in R to do such numerical integration given such function form and parameter values? Thanks for your kind support on this. Have a
2011 Jan 18
2
Convert a matrix's columns to list
...quot; > a <- matrix(1:10, 5, 2) > a [,1] [,2] [1,] 1 6 [2,] 2 7 [3,] 3 8 [4,] 4 9 [5,] 5 10 I would like to have a list "b" like this > b <- list(a[, 1], a[, 2]) > b [[1]] [1] 1 2 3 4 5 [[2]] [1] 6 7 8 9 10 Thanks in advance! Feng -- Feng Li Department of Statistics Stockholm University 106 91 Stockholm, Sweden http://feng.li/ [[alternative HTML version deleted]]
2011 Jan 29
1
Spare matrix multiplication
...o time consuming because I have to do this thousands of times. I also tried to partition A into 100 small blocks and use mapply function to multiply by each B_i, but that is even slower. I am wondering if there is an efficient way to perform this type of multiplication with R? Thanks in advance! Feng -- Feng Li Department of Statistics Stockholm University 106 91 Stockholm, Sweden http://feng.li/ [[alternative HTML version deleted]]
2013 Nov 22
10
[PATCH v4] x86: properly handle MSI-X unmask operation from guests
...nging the hypercall interface v2:Totally handled inside hypervisor. v3:Change some logics of handling msi-x pending unmask operations. v4:Some changes related to coding style according to Andrew Cooper''s comments From 51c5b7f1f9c8f319da8adf021b39e18fbd3bf314 Mon Sep 17 00:00:00 2001 From: Feng Wu <feng.wu@intel.com> Date: Wed, 13 Nov 2013 21:43:48 -0500 Subject: [PATCH] x86: properly handle MSI-X unmask operation from guests For a pass-through device with MSI-x capability, when guest tries to unmask the MSI-x interrupt for the passed through device, xen doesn''t clear the...
2011 Jan 12
2
How to disable using "enter" key to exit the browser in debugging mode
...prompt to debug as follows, it will eventually jump out before I can do anything. ####### copy starting from this line ############## test <- function() { x<- 5 browser() y<-4 } test() ######## end of copy at this line ################ Any suggestions are most welcome! Feng -- Feng Li Department of Statistics Stockholm University 106 91 Stockholm, Sweden http://feng.li/ [[alternative HTML version deleted]]
2010 Sep 24
3
boundary check
...,1] [,2] [,3] [,4] [,5] [1,] -0.1525543 0.4606419 -0.1011011 -1.557225 -1.035694 is inside the boundary of X or not. I know it's easy to do it with 1-D or 2-D, but I don't knot how to manage it when the dimension is large. Can someone give a hint? Thanks in advance! Feng -- Feng Li Department of Statistics Stockholm University 106 91 Stockholm, Sweden http://feng.li/ [[alternative HTML version deleted]]
2009 Jan 22
4
Is there a plugin that can autofill(ajax) during user input?
I haven''t done rails in a year, but can someone tell me if there is a plugin or how much work is it to add an auto fill function like google''s front page? Would you just use an observer on the form or is there already a built in class that can do this? Thanks! Feng -- Posted via http://www.ruby-forum.com/. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gman...
2010 Oct 12
1
lapply to subsets
...= array(1:30, c(2, 3, 5))) I wish to calculate the mean of A$a, and A$b w.r.t. their third dimension so I did lapply(A,apply,c(1,2),mean) Now if I still wish to do the above task but take away some burn-in, e.g. do not take A$a[,,1:2],and A$b[,,1:2] into account. How can I do then? Thanks! Feng -- Feng Li Department of Statistics Stockholm University 106 91 Stockholm, Sweden http://feng.li/ [[alternative HTML version deleted]]
2010 Sep 07
4
a^c(1:3)
...ther ways of doing this. And the second question is why I get such result when I put another element in the exponent part like this, > a^c(2, 3, 4) [,1] [,2] [,3] [1,] 1 81 125 [2,] 8 16 1296 BTW, I have a 64bit R version (2.11) for Linux. Any advice would be appreciated. Feng -- Feng Li Department of Statistics Stockholm University 106 91 Stockholm, Sweden http://feng.li/ [[alternative HTML version deleted]]
2009 Nov 05
2
rm(list<-ls()) error
Dear R, Why rm(list<-ls()) gives an error but rm(list=ls()) not?. I remember the operator ‘<-’ can be used anywhere... Thanks! Feng -- Feng Li Department of Statistics Stockholm University 106 91 Stockholm, Sweden http://feng.li/ [[alternative HTML version deleted]]
2009 Feb 11
5
How to handle large numbers?
...b=1007, and c=5). R gives me NaN when I use the following command: > exp(1000)/(exp(1007)+5) [1] NaN I am pretty sure this should be close to zero. My question is whether there is a general way to solve this kind of question or should I do some settings before computing? Thanks in advance! Feng -- Feng Li Department of Statistics Stockholm University 106 91 Stockholm, Sweden [[alternative HTML version deleted]]
2013 Jul 17
1
Re: Hotplug of disk devices in LXC failed with libvirt of version 1.0.2
On 07/17/2013 04:15 PM, Gao feng wrote: > On 07/16/2013 01:29 PM, Guan Qiang wrote: >> 于 2013/7/15 17:32, Gao feng 写道: >>> On 07/15/2013 05:18 PM, hzguanqiang wrote: >>>> Hi, Gao Feng >>>> >>>> I've tried what you said, but still exists the problem: >>>> >&gt...
2003 Mar 05
8
How to draw several plots in one figure?
Hey, I want to draw several plots sequently, but have to make them dispaly in one figure. So how to achieve this? Thanks. Fred
2013 Aug 26
1
Re: 回复: How to deal with LXC cgroup access control withapparmor ?
...ble the cgroup in container" I meant if the user namespace not enabled in kernel ... thx ,I will try user namespace later. I am not working on x86 and not suer wheather the usernamespace is ok in the kernel I am going to use. I would try to disable the cgroup in lxc first. THX to Gao feng . ------------------ 止语 ------------------ Original ------------------ From: "Gao feng"<gaofeng@cn.fujitsu.com>; Date: Mon, Aug 26, 2013 05:07 PM To: "jj"<jj@yuzao.org>; Cc: "libvirt-users"<libvirt-users@redhat.com>; Subject: Re: [libvir...
2013 Jul 16
2
Re: Hotplug of disk devices in LXC failed with libvirt of version 1.0.2
于 2013/7/15 17:32, Gao feng 写道: > On 07/15/2013 05:18 PM, hzguanqiang wrote: >> Hi, Gao Feng >> >> I've tried what you said, but still exists the problem: >> >> ubuntu@lxc:~$ vir attach-disk instance-0000002c /dev/dm-0 sdb >> error: Failed to attach disk >> error: Unable to c...
2003 Apr 08
5
Help on smooth.spline?
Hey, R-listers I was recommended to try using smooth.spline function for estimating 2-Dimensinal curve given a data set. So will you please tell me where to get this R function? Or which package provides this function? Thanks for your point. Fred
2015 Aug 24
4
Error building llvm
Trying to run make to build llvm, I faced the following error: Linking CXX shared library ../../lib/libLTO.so collect2: error: ld returned 1 exit status make[2]: *** [lib/libLTO.so.3.8.0svn] Error 1 make[1]: *** [tools/lto/CMakeFiles/LTO.dir/all] Error 2 make: *** [all] Error 2 So, what's the problem here? Regards, Marwa Yusuf Teaching Assistant - Computer Engineering Department