similar to: Fast way of finding top-n values of a long vector

Displaying 20 results from an estimated 3000 matches similar to: "Fast way of finding top-n values of a long vector"

2008 Apr 15
1
disturbing seed dependence in optim L-BFGS-B method
The the use of optim with the L-BFGS-B method for the following simple function gives erroneous results. Any help appreciated! Best, Bob Reilly # Code: V=function(p){ p1=p[1];p2=p[2] y=p1*p2-.4*(p1+p2) return(-y)} p=c(.2,.2) # p=c(.8,.8) max=optim(p,V,method = "L-BFGS-B",lower=c(0,0),upper=c(1,1)) max1=optim(max$par,V,method = "L-BFGS-B",lower=c(0,0),upper=c(1,1))
2009 Dec 28
2
Modified R Code
Dear R helpers,   I have following input files. (Actually they are more than 10 rates but here i am considering only 2 rates to write my problem)   rate1.csv min1        max1            min2          max2          min3           max3 1.05        1.30               1.30          1.65             1.65          1.99   rate2.csv min1        max1            min2          max2          min3          
2016 Nov 08
2
should we have IR intrinsics for integer min/max?
Thanks, Hal and Matt for the feedback. As usual, my instincts about canonicalization were probably wrong. :) I thought that @max1 vs. @max3 would be viewed as an unknowable trade-off between reducing the dependency chain and the pseudo-canonical min/max form, so we'd add intrinsics, and defer that decision to the backend. I'll wait to see if there are any other arguments presented.
2012 Jan 27
3
Subsetting for the ten highest values by group in a dataframe
Hello, I am looking for a way to subset a data frame by choosing the top ten maximum values from that dataframe. As well this occurs within some factor levels. ## I've used plyr here but I'm not married to this approach require(plyr) ## I've created a data.frame with two groups and then a id variable (y) df <- data.frame(x=rnorm(400, mean=20), y=1:400,
2017 Jan 23
1
[PATCH] virtio_net: fix PAGE_SIZE > 64k
I don't have any guests with PAGE_SIZE > 64k but the code seems to be clearly broken in that case as PAGE_SIZE / MERGEABLE_BUFFER_ALIGN will need more than 8 bit and so the code in mergeable_ctx_to_buf_address does not give us the actual true size. Cc: John Fastabend <john.fastabend at gmail.com> Signed-off-by: Michael S. Tsirkin <mst at redhat.com> --- Lightly tested on x86
2017 Jan 23
1
[PATCH] virtio_net: fix PAGE_SIZE > 64k
I don't have any guests with PAGE_SIZE > 64k but the code seems to be clearly broken in that case as PAGE_SIZE / MERGEABLE_BUFFER_ALIGN will need more than 8 bit and so the code in mergeable_ctx_to_buf_address does not give us the actual true size. Cc: John Fastabend <john.fastabend at gmail.com> Signed-off-by: Michael S. Tsirkin <mst at redhat.com> --- Lightly tested on x86
2016 Nov 07
5
should we have IR intrinsics for integer min/max?
Hi - The answer to this question may help to resolve larger questions about intrinsics and vectorization that were discussed at the dev mtg last week, but let's start with the basics: Which, if any, of these is the canonical IR? ; ret = x < y ? 0 : x-y define i32 @max1(i32 %x, i32 %y) { %sub = sub nsw i32 %x, %y %cmp = icmp slt i32 %x, %y ; cmp is independent of sub %sel = select
2009 Apr 28
3
truehist and density plots
Hi, I wanted to plot the histogram of a vector and then, plot the density function of subsets of the vector on the histogram. So I use truehist in MASS package and lines(density) as follows: length(b) = 1000 truehist(b) lines(density(b[1:100])) however the density plot of the first 100 points exceeds the max of y axis (see attached). how is it possible to make a graphics so that the density plot
2016 Apr 18
0
[PATCH v4 06/37] volt: parse the max voltage map entries
There are at least three "max" entries, which specify the max voltage. Because they are actually normal voltage map entries, they can also be affected by the temperature. Nvidia respects those entries and if they get changed, nvidia uses the lower voltage from both. We shouldn't exceed those voltages at any given time. v2: state what those entries do in the source v3: add the
2005 Nov 24
0
htb thingy
hi all i want to first apollogiaze if my message will annoy you(my guess is because it will be quite large:)) i have the following situation on my hands i was recently faced with the problem of traffic shaping/bandwith limiting. my setup is(very common i guess) -internet comming in(going out) through eth0 -internet is being "shared" with the private local network via eth1. i
2008 May 09
2
which.max2()
Hello, which.max() only returns one index value, the one for the maximum value. If I want the two index values for the two largest values, is this a decent solution, or is there a nicer/better R'ish way? max2 <-function(v) { m=which.max(v) v[m] = -v[m] m2=which.max(v) result=c(m, m2) result } Seems to work ok. Thanks, Esmail
2009 Jun 19
1
Alternate ways of finding number of occurrence of an element in a vector.
Hi, I have a vector "v" and would like to find the number of occurrence of element "x" in the same. Is there a way other than, sum(as.integer(v==x)) or length(which(x==v)) to do the this. I have a huge file to process and do this. Both the above described methods are pretty slow while dealing with a large vector. Please have your comments. Praveen
2010 Aug 06
3
memory use without running gc()
Is there any way to get the current memory used by R without running gc()? I'd like to include the memory usage in logging output, but calling gc() to get that information takes long enough to be noticeable (~ 6 s with ~ 20 GB of ram in use), which goes against the point of logging. Thanks, Johann
2015 Feb 05
3
Rcurl crash in R-devel
Hello, I don't know if the problem originates from R-devel 3.2 or Rcurl itself. I post this message to the R-devel list and to the author of RCurl (duncan at r-project.org). > library("RCurl") Le chargement a n?cessit? le package : bitops > print(sessionInfo()) R Under development (unstable) (2015-02-03 r67717) Platform: x86_64-apple-darwin13.4.0 (64-bit) Running under:
2016 Mar 28
1
[PATCH v2 06/22] volt: parse the both max voltage entries
On 21/03/16 18:16, Karol Herbst wrote: > these entries specify a maximum voltage nvidia never exceeds, we shouldn't do > that, too. > > Signed-off-by: Karol Herbst <nouveau at karolherbst.de> > --- > drm/nouveau/include/nvkm/subdev/bios/vmap.h | 2 ++ > drm/nouveau/include/nvkm/subdev/volt.h | 2 ++ > drm/nouveau/nvkm/subdev/bios/vmap.c | 5
2015 Aug 24
4
[PATCH] nv50: avoid using inline vertex data submit when gl_VertexID is used
The hardware only generates vertexid when vertices come from a VBO. This fixes: vertexid-drawelements vertexid-drawarrays Signed-off-by: Ilia Mirkin <imirkin at alum.mit.edu> Cc: "11.0" <mesa-stable at lists.freedesktop.org> --- src/gallium/drivers/nouveau/nv50/nv50_program.c | 1 + src/gallium/drivers/nouveau/nv50/nv50_program.h | 1 +
2020 Jul 16
1
R 4.0 for ARM processors
2 years ago at one Meetup in Paris, Marc Girondot, professor at University Paris-Saclay, presented his cluster built with 12 Odroid (equivalent to Rapsberry Pi). The stack was almost the same size than your picture as there was no fan and a narrower distance between each PCB card. There were many more cables. For a total cost of less than 1000 ? and an electrical consumption reduced by a
2004 Jan 19
0
problem with wrr+prio
I have set up wrr successfully on my bridge/shaper machine. That much works fine. I originally used sfq in the inner classes. However, there was a problem with high-bandwidth connections (web downloads, bittorrent) starving low-bandwidth low-latency connections like ssh. I would like to use prio or similar to prioritize the interactive traffic, but it does not seem to work. I have tested with
2016 Aug 16
21
[PATCH v5 00/20] Engine Reclocking Fixes for Fermi-Maxwell2
I've splitted my big series between the part which actually fixes the engine reclocking bits and the part handling voltage/clock updates on temperature change, so that the more reviewed parts can be merged in faster. This series fixes a lot of Engine reclocking issues found on Fermi, Kepler and all Maxwell generation GPUs. It does _not_ fix memory reclocking on Fermi. It mostly contains of
2024 Jan 25
1
enable strong KexAlgorithms, Ciphers and MACs in /etc/ssh/sshd_config file on RHEL 8.x Linux OS
Hi Kaushal, I maintain a set of SSH hardening guides for various platforms, including RHEL 8. You can find them here: https://ssh-audit.com/hardening_guides.html - Joe -- Joseph S. Testa II Founder & Principal Security Consultant Positron Security On Thu, 2024-01-25 at 18:39 +0530, Kaushal Shriyan wrote: > Hi, > > I am running the below servers on Red Hat Enterprise