search for: intractable

Displaying 20 results from an estimated 67 matches for "intractable".

2012 Nov 27
1
the problem is intractable, and perhaps insoluble
...have any real answers. so it's a good thing nobody expects any answers from jim. *** on the other hand, people _do_ expect (or at least _hope_) that greg will have some real answers. alas, it seems not... this latest "solution" won't work, because it doesn't address the intractable nature of the problem that underlies all this. let's use #76 to focus our thinking. what we need to do to have any "success" here is to actively discourage users from downloading #76 for _any_ reason... ideally, we would like to drive its download-count to _zero_. (in a perfect wo...
2010 Aug 03
0
"glmulti": excluding intractions between variables
Hello, I'm using the "glmulti" package to run models of all the possible combinations of my variables. However, I am only interested in a few interactions between them. I have tried the equivalent of: 1) mod1<-lm(y~a+b+c+a:b) glmulti(mod1, level=1) 2) mod2<-lm(y~a+b+c+a:b) glmulti(mod2, level=2) 3) glmulti("y", c("a",
2010 Aug 03
1
"glmulti": defining which intractions between variables are to be included
Hello, I'm using the "glmulti" package to run models of all the possible combinations of my variables. However, I am only interested in a few interactions between my variables. I have tried the equivalent of: mod1<-lm(y~a+b+c+a:b) glmulti(mod1, level=1) mod2<-lm(y~a+b+c+a:b) glmulti(mod2, level=2) and glmulti("y", c("a", "b", "c"),
2006 Jan 28
2
bug - 3.0.14, 3.0.21 intractable browsing problems - help needed
Hello: This browsing problem is not going away. We have followed the how-to, used someone else's "known good" config, perused packet dumps until we were blue, and tried replicating the setup in a laboratory environment to see if it was site-specific. The problem is still there: If the Samba server is the domain browser, the Network Neighborhood (or My Network Places) for the
2001 Jun 06
2
ssh-keygen key conversion questions
...with two questions. First, the inability to convert encrypted commercial keys into similarly encrypted OpenSSH keys is unfortunate. Can anyone give me the standard story on why this doesn't work as one might hope? Is it simply a feature that is waiting to be implemented, or are there deeper intractable issues? Second, there is one conversion path missing. How does one convert an OpenSSH private key into a commercial private key? Thank you!
2019 Jan 31
5
Status of the function merging pass?
...ved problem. I.e., it's hard for the MergeFunctions pass to be *really sure* that two functions are a) really identical and b) safe to merge. Is there a systematic solution at the IR-level, given that the semantics of IR are subject to change? Is extensive testing the only solution? Or is this intractable, and the only safe approach is to perform merging post-regalloc (or, at some late point when equivalence is easier to determine)? thanks, vedant -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20190131/95fdd9...
2009 May 04
1
Randomized-complete blocks design and R
Hi, I am new in R.I am trying to analysis of variance for Randomized-complete blocks design. I have 4 treatments and 3 replication, Without intraction.then .I is going to use LSD test or Duncan test for comparison between average values of treatments. I want to know, is there any significant change between treatment and between weeks? Because I did experiment for 8 weeks. I am not
2011 Jan 13
1
Rename public folders
...CANNOT] Renaming not supported across non-private namespaces. I guess this is because renaming a subfolder could potentially break subscriptions for other users? Or is it a hard requirement from IMAP RFC? If the former, is the problem merely very complicated, but eventually fixable, or is it just intractable? We're using Dovecot 2.0.7 from the atrpms RPM, Redhat EL 5.0. The public mailbox namespace is configured with: namespace { type = public prefix = Public/ separator = / hidden = no list = yes inbox = no subscriptions = no location = maildir:/data/imapmail/public:LAYOUT=fs } -...
2002 Apr 12
1
summary: Generalized linear mixed model software
...ose who responded to my inquiry about generalized linear mixed models on R and S-plus. Before I summarize the software, I note that there are several ways of doing statistical inference for generalized linear mixed models: (1)Standard maximum likelihood estimation, computationally intensive due to intractable likelihood function (2) Penalized quasi likelihood or similar approximations (Breslow & Clayton, 1993; Lee & Nelder, 1999, Schall 1991). This method is not good for binomial outcomes in particular. Theoretically, it is consistent when the cluster size increases. It is not consistent when t...
2007 Aug 07
0
[LLVMdev] Un-inlining functions?
I found a book on this (http://www.amazon.com/Automatic-Algorithm- Recognition-Replacement-Optimization/dp/0262133687) on Amazon. Last I heard this was considered an intractable problem in the general case... but ad hoc solutions for specific functions (like memcpy) are possible. That book looks fairly promising. On Aug 7, 2007, at 10:32 AM, Nikhil A. Patil wrote: > Hi, > > This is really more a general compiler question, not so specific to > LLVM. >...
2007 Aug 07
3
[LLVMdev] Un-inlining functions?
Hi, This is really more a general compiler question, not so specific to LLVM. Given a set of pre-defined "primitive" functions, is there a way to un-inline function calls out of a function? (This is different from "extracting" functions because you are not allowed to create a new function, but only to use existing functions in the pool. These "primitive" functions
2011 May 05
1
[LLVMdev] Could LLVM or Clang go backward to modify c source code?
...know that way is infeasible. Thanks again. 2011/5/5 Joshua Warner <joshuawarner32 at gmail.com> > Wen-Han, > > It sounds like there are two problems here: first is detecting when free is > not properly called, and figuring out where to insert the call - which seems > like an intractable problem by iteself. Second is a reversible translation > from C to LLVM IR. LLVM does (did?) have support for generating C code > again on the back end, but the result doesn't look that much like the > original code. In order to translate changes from the IR back to the source >...
2010 Oct 13
2
Using NLS with a Kappa function
...c in the limit with k -> 0. This causes a problem because the Kappa function has a term raised to (1/k)th power leading the numerical singularlity for low values of k. (Since the logistic function gave a good fit, then I am sure that best fit value for k is very small.) If so, this problem would intractable, but I thought I see what response I got from other users before giving up on this track. Here are a few lines from the command line: > funct3 function(x, h, k, z, a) { (1 - h*(1 - k*(x - z)/a)^(1/k))^(1/h) } > reg24 <-nls(FldFatRate ~ funct3(MeanDepth_m, h,k,z,a), data=data1, + start=l...
2008 Nov 27
1
lmer refuses nested random factors
...y fine with the correct group sizes: >Number of Observations: 246 >Number of Groups: > TEST PLANT %in% TEST > 41 123 I couldn't find this error mentioned in any other posts on the list. Can someone enlighten me as to how to get around this intractable problem? My crude solution is to go around the obstacle by computing the mean of each plant pair and using a GLM with poisson distribution and ignore random effects. Martin ************************************************************************ Martin Henery Post doctoral researcher Dépa...
2005 Aug 11
1
name resolving on a simple network
Pardon me if I don't adhere to list protocol - this is my first post: I have a simple home network with a seemingly intractable problem. I'm pretty new to Samba, though, and I can't help but think the answer, like the purloined letter in Edgar Allan Poe's story, is staring me in the face. Various folks have been helping me over on the Fedora list for 9 days, now, so I thought I'd try this problem here....
2013 Apr 07
0
[LLVMdev] Integer divide by zero
...model of the LLVM IR to be *parameterized*. In one mode, an instruction would produce undefined behavior on division, and in another mode it would produce a trap. Then you are asking for the optimizer stack to support either semantic model, and produce efficient code regardless. This is completely intractable for LLVM to support. It would make both the optimizers and the developers of LLVM crazy to have deep parameterization of the fundamental semantic model for integer division. The correct way to support *exactly* reproducing the architectural peculiarities of the x86-64 integer divide instruction is...
2019 Feb 01
6
Status of the function merging pass?
...ved problem. I.e., it's hard for the MergeFunctions pass to be *really sure* that two functions are a) really identical and b) safe to merge. Is there a systematic solution at the IR-level, given that the semantics of IR are subject to change? Is extensive testing the only solution? Or is this intractable, and the only safe approach is to perform merging post-regalloc (or, at some late point when equivalence is easier to determine)? In Rust we've been running with MergeFunctions enabled by default for a while now, and have recently also enabled the use of aliases instead of thunks. Apart from s...
2005 Aug 13
2
problems with name resolution in a small home network
Pardon me if I don't adhere to list protocol - this is my first post: I have a simple home network with a seemingly intractable problem. I'm pretty new to Samba, though, and I can't help but think the answer, like the purloined letter in Edgar Allan Poe's story, is staring me in the face. Various folks have been helping me over on the Fedora list for 9 days, now, so I thought I'd try this problem here....
2016 Nov 12
2
Ubuntu 16.10 Yakkety Yak uses GCC 6 but -std=c++98 is missing
On 13 November 2016 at 00:13, Kirill M?ller wrote: | On 13.11.2016 00:00, Dirk Eddelbuettel wrote: | > On 12 November 2016 at 22:54, Kirill M?ller wrote: | > | > [... lots of stuff deleted ...] | > | > | I noticed this because plogr logging crashed in dplyr (compiled with gcc | > | 6) right after upgrading to yakkety; I still had a gcc-5 built version | > | of Rcpp installed.
2013 Apr 07
3
[LLVMdev] Integer divide by zero
Hey again, Thank you for your opinions. I will take them into consideration. A few comments... On Sun, Apr 7, 2013 at 1:39 PM, Jeffrey Yasskin <jyasskin at google.com> wrote: ... > If the performance penalty is unclear to you, that means you haven't > measured it. Until you measure, you have absolutely no business > complaining about a potential performance problem. Measure,