search for: log_2

Displaying 19 results from an estimated 19 matches for "log_2".

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2013 Feb 21
2
[PATCH] xen: consolidate implementations of LOG() macro
...mp; 0x00000002) ? 1 : 0) -#define __L4(_x) (((_x) & 0x0000000c) ? ( 2 + __L2( (_x)>> 2)) : __L2( _x)) -#define __L8(_x) (((_x) & 0x000000f0) ? ( 4 + __L4( (_x)>> 4)) : __L4( _x)) -#define __L16(_x) (((_x) & 0x0000ff00) ? ( 8 + __L8( (_x)>> 8)) : __L8( _x)) -#define LOG_2(_x) (((_x) & 0xffff0000) ? (16 + __L16((_x)>>16)) : __L16(_x)) - void __dummy__(void) { OFFSET(UREGS_sp, struct cpu_user_regs, sp); diff --git a/xen/arch/x86/x86_64/asm-offsets.c b/xen/arch/x86/x86_64/asm-offsets.c index b6d1919..6dc832c 100644 --- a/xen/arch/x86/x86_64/asm-offsets....
2005 Jan 26
2
Butterflies in mdct.c
In mdct.c there's some functions including some-point butterfly. In 32-point and 16-point there are calling of smaller-point function everytime twice on each half of data. When I looked on it I found that's just linear algebra. So it can be rewritten to matrix multiplication. Some one can say: there's optimization on in register working. But imagine there's one calling 32-point,
2001 Apr 03
3
single-pass algorithm for quantile calculation
Dear R users, I am looking for a reference to an algorithm for estimation of sample quantiles which does not require bringing the whole data into memory (more precisely its memory complexity should be much less than linear, ideally constant). I realize that such an algorithm can only be approximate and actually quite wrong for some samples, but that's fine with me. Thank you, Vadim
2002 Aug 19
1
latex for xlab
Hi all, I don't find the solution to my problem . I represent some points and i would like a title for the x axis. I would like to write log_2 where 2 is a subscript of log. I think i have to use the functions parse or expression but i have some difficulties to understand how i should use them. Thanks -- -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- Olivier MARTIN PhD student phon...
2004 Apr 11
3
pcauchy precision (PR#6756)
Full_Name: Morten Welinder Version: snapshot OS: Submission from: (NULL) (65.213.85.129) Two things are wrong. 1. There is nan test outside IEEE_754. 2. The meat part of the function should really be something like... if (!lower_tail) x = -x; if (fabs (x) > 1) { double temp = atan (1 / x) / M_PI; return (x > 0) ? R_D_Clog (temp) : R_D_val (-temp); } else
2017 Mar 07
0
Bug in sample()
...tegers between 1 and n. (If we are reading the code correctly, the method is to multiply a pseudo-random binary fraction by n, take the floor, and add 1; this suffers from quantization effects that can get quite large when n is just below 2^31). A better method, used in Python, is to generate ceil(log_2(n)) pseudo-random bits, add 1, and discard values bigger than n. Attached is a short document explaining the issue in more detail. Best, Kellie -- Kellie Ottoboni Ph.D. Statistics '19, University of California, Berkeley Fellow at Berkeley Institute for Data Science Mobile: (650) 520-5056 W...
2011 Feb 11
1
cycle in a directed graph
Hi, I have a directed graph and wants to find is there any cycle in it? If it is, which nodes or edges are in the cycle. Is there any way to find the cycle in a directed graph in R? Regards, Amir
2006 May 16
0
rtbl_talk() call failed
...data/snmp/ , but i have a problem when i run it , i get an error rtnetlink call failed, reason: 2 , no such file or directory i found this line in the file delete_object_util.c rtnl_talk(&rth, &req.n, 0, 0, NULL,NULL,NULL); result=errno; if(result!=0) syslog(LOG_2,"rtnetlink call failed, reason: %i, %s", result, strerror(result)); rtnl_close(&rth); return(result); whatis rtnl_talk() do ?? help me please, thanks ragu --------------------------------- Blab-away for as little as 1ยข/min. Make PC-to-Phone Calls using Y...
2013 Jun 13
5
[LLVMdev] DataFlowSanitizer design discussion
...s or thousands of taint labels, as the label union operation becomes O(n) in the number of supported labels, and data associated with it will quickly dominate the live variable set, causing register spills and hampering performance. Instead, a low overhead approach is proposed which is best-case O(log_2 n) during execution. The underlying assumption is that the required space of label unions is sparse, which is a reasonable assumption to make given that we are optimizing for the case where applications mostly copy data from one place to another, without often invoking the need for an actual union...
2013 Jun 26
0
[LLVMdev] DataFlowSanitizer design discussion
...s or thousands of taint labels, as the label union operation becomes O(n) in the number of supported labels, and data associated with it will quickly dominate the live variable set, causing register spills and hampering performance. Instead, a low overhead approach is proposed which is best-case O(log_2 n) during execution. The underlying assumption is that the required space of label unions is sparse, which is a reasonable assumption to make given that we are optimizing for the case where applications mostly copy data from one place to another, without often invoking the need for an actual union...
2013 Oct 04
0
Recovering btrfs fs after "failed to read chunk root"
...unt -o recovery and even btrfs-restore. I find this discussion: http://www.mail-archive.com/linux-btrfs@vger.kernel.org/msg25990.html So I tried several times with btrfs chunk-recover: If I keep all the disks, it goes like this: [root@tambura btrfs-progs]# ./btrfs chunk-recover -v /dev/sdb1 > log_2.txt All Devices: Device: id = 3, name = /dev/sdc2 Device: id = 4, name = /dev/sda2 Device: id = 1, name = /dev/sdb1 btrfs: cmds-chunk.c:125: process_extent_buffer: Assertion `!(exist->nmirrors >= 2)'' failed. So I did try removing sdc2 (that is the drive where...
2001 Jun 05
1
11.82 bpw clarification (was Re: ssh-keygen(1) misinfo: English prose entropy 0.6 - 1.3 b/char!)
...e SUM_1^inf 0.1/n is infinite. If we assume (in the absence of any better estimate) that the formula p_n = 0.1/n holds out to the n at which the total probability is unity, and that p_n = 0 for larger n; we find that the critical n is the word rank 8,727. The entropy is then: -SUM_1^8727 p_n log_2 p_n = 11.82 bits per word." YHNBT. YHL. HAND. I, Zone Lee Free, encrypted, secure Web-based email at www.hushmail.com
2013 Mar 11
1
Implementation of the PL2 weighting scheme of the DFR Framework
Hello guys.I am working on implementing the PL2 weighting scheme of the DFR framework by Gianni Amati. It uses the Poisson approximation of the Binomial as the probabilistic model (P), the Laplace law of succession to calculate the after effect of sampling or the risk gain (L) and within document frequency normalization H2(2) (as proposed by Amati in his PHD thesis). The formula for w(t,d) in
2013 Aug 07
2
[LLVMdev] DataFlowSanitizer design discussion
..., as the label > union operation becomes O(n) in the number of supported labels, and > data associated with it will quickly dominate the live variable set, > causing register spills and hampering performance. > > Instead, a low overhead approach is proposed which is best-case > O(log_2 n) during execution. The underlying assumption is that the > required space of label unions is sparse, which is a reasonable > assumption to make given that we are optimizing for the case where > applications mostly copy data from one place to another, without often > invoking the need...
2012 Nov 22
41
[PATCH V3] vmx/nmi: Do not use self_nmi() in VMEXIT handler
The self_nmi() code cause''s an NMI to be triggered by sending an APIC message to the local processor. However, NMIs are blocked by the VMEXIT, until the next iret or VMENTER. Volume 3 Chapter 27 Section 1 of the Intel SDM states: An NMI causes subsequent NMIs to be blocked, but only after the VM exit completes. As a result, as soon as the VMENTER happens, an immediate VMEXIT happens
2013 Feb 22
48
[PATCH v3 00/46] initial arm v8 (64-bit) support
This round implements all of the review comments from V2 and all patches are now acked. Unless there are any objections I intend to apply later this morning. Ian.
2013 Jan 23
132
[PATCH 00/45] initial arm v8 (64-bit) support
First off, Apologies for the massive patch series... This series boots a 32-bit dom0 kernel to a command prompt on an ARMv8 (AArch64) model. The kernel is the same one as I am currently using with the 32 bit hypervisor I haven''t yet tried starting a guest or anything super advanced like that ;-). Also there is not real support for 64-bit domains at all, although in one or two places I
2012 Jan 09
39
[PATCH v4 00/25] xen: ARMv7 with virtualization extensions
Hello everyone, this is the fourth version of the patch series that introduces ARMv7 with virtualization extensions support in Xen. The series allows Xen and Dom0 to boot on a Cortex-A15 based Versatile Express simulator. See the following announce email for more informations about what we are trying to achieve, as well as the original git history: See
2011 Dec 06
57
[PATCH RFC 00/25] xen: ARMv7 with virtualization extensions
Hello everyone, this is the very first version of the patch series that introduces ARMv7 with virtualization extensions support in Xen. The series allows Xen and Dom0 to boot on a Cortex-A15 based Versatile Express simulator. See the following announce email for more informations about what we are trying to achieve, as well as the original git history: See