Displaying 20 results from an estimated 700 matches similar to: "Randomising matrices"
2005 Feb 09
6
randomisation
Dear useRs
I am looking for a way to randomise the values within a matrix:
the conditions are that the sums of the rows and the sums of the columns should
remain the same as in the original matrix.
Any help would be appreciated
Cheers
Yann
2005 Feb 15
2
[LLVMdev] Entry block (Randomisation)
Tanu Sharma wrote:
> Hello,
>
> In an attempt to randomise the basic blocks in a function, is it
> possible that I can randomise the entry block as well? And maybe insert
> some instructions in the pass to call entry block while running the
> program ?
>
> Is it feasible?
>
> What does entry block consist of ?
The entry block, by definition, is the first basic
2005 Feb 15
0
[LLVMdev] Entry block (Randomisation)
Hello,
In an attempt to randomise the basic blocks in a function, is it possible that I can randomise the entry block as well? And maybe insert some instructions in the pass to call entry block while running the program ?
Is it feasible?
What does entry block consist of ?
Thanks
Tanu
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2009 Jun 04
4
order() with randomised order in ties?
Hi
I want to use order() to get the order of a vector.
But I would need a different behavior when ties occur: similar to the
parameter ties.method = "random" in the rank() function, I would need
to randomise the ties. Is this possible?
Example:
x <- rep(1:10, 2)
order(x)
[1] 1 11 2 12 3 13 4 14 5 15 6 16 7 17 8 18 9 19 10 20
order(x)
[1] 1 11 2 12 3 13 4 14 5 15
2006 Jan 28
4
Randomised variables from sql
I''ve spent some time converting my website from php to RoR, and so far,
I''m loving every bit of Rails. However, I''ve stumbled across a problem.
On my old page, I''ve had a random quote display at a specific location,
and I''d like to replicate this with RoR. Basically, I thought I would be
able to add all quotes into a specific table in the database,
2010 Nov 13
1
Efficient marginal sums?
Hi Folks,
[This is not unrelated to the current "vector of vectors" thread,
but arises quite independently]
Say I have a function f(x,y) which computes a value for scalar
x and y; or, if either x=X or y=Y is a vector, a corresponding
vector of values f(X,y) or f(x,Y) (with the usual built-in
vectorisation of operations).
Now I have X=(x.1,x.2,...,x.m) and Y=(y.1,y.2,...,y.n).
I'm
2005 Feb 15
2
[LLVMdev] Removing $(LLVM_SRC_ROOT)/autoconf dependensies in Stacker, llvm-java [PATCH]
On Mon, 14 Feb 2005, Reid Spencer wrote:
> isn't necessarily tied to LLVM. Anyway, lets cross that bridge when we
> get there.
Sounds good.
-Chris
--
http://nondot.org/sabre/
http://llvm.cs.uiuc.edu/
2002 Dec 17
3
Changing "..." inside a function: impossible? desirable?
This is was something like a request for your comments, thoughts
on the topic...
Many of you will know that the "..." (aka \dots) argument is
very useful for passing ``further graphical parameters'',
but can be a pain when itself is passed to too many plotting
functions inside your own function.
An artificial example being
myplot <- function(x,y, ...) {
plot(0:1, 0:1,
2002 Mar 26
1
installing gzip files
I'm trying to install an R package that arrived in a
package.tar.gz file.
I use:
R INSTALL -l /home/adele/packagedir package.tar.gz
and I get:
ERROR: cannot extract package from package.tar.gz
The author of the package assures me that the same
command works for his version of solaris and R.
He has solaris 5.7 and R 1.4.1, while I have
solaris 5.8 and R 1.4.1.
Does anyone know
2004 Jul 20
4
stupid question
forgive me.. i have no idea what im asking or if its possible... i have 2
partitions as follows and am using the std windows xp bootloader to boot xp
- ntfs (windows xp)
- fat16
stupid question is... can i use syslinux, isolinux, memdisk or some combo
there of to place a bootable cdrom iso image on the fat16 partition and then
have a boot menu with something to the effect of :
1) winxp as
2004 Sep 23
3
folding table into a matrix
I'm just getting started with R, so feel free to point me to the
appropriate documentation if this is already answered somewhere (though
I've been unable to find it myself). This does seem like a rather
basic question.
I want to fold a table into a matrix. The table is formatted like so:
Column_Index Value
1 486
2 688
3 447
4 555
5
2003 May 13
1
Creating HD Boot Images
I have been trying to track down information on building HD boot images for
ISOLINUX and MEMDISK, and so far, haven't had a whole lot of luck.
I've found a number of sources describing the process of setting up
ISOLINUX and MEMDISK, and how to configure the boot CD to boot various
OS's. I've also read through Bart Lagerweij's BootCD/ModBoot pages, and
Mikhail
2013 Oct 15
1
plotting a marginal distribution on the plane behind a persp() plot
R'istas:
I am trying to plot a marginal distribution on the plane behind a persp() plot. My existing code is:
library(MASS)
X <- mvrnorm(1000,mu=c(0,0),Sigma=matrix(c(1,0,0,1),2))
X.kde <- kde2d(X[,1],X[,2],n=25) # X.kde is list: $x 1*n, $y 1*n, $z n*n
persp(X.kde,phi=30,theta=60,xlab="x_b",ylab="x_a",zlab="f") ->res
Any suggestions are very
2005 Feb 17
4
[LLVMdev] Branching to Entry block
On Thu, 17 Feb 2005, Tanu Sharma wrote:
> I created a new block and inserted it into the present basic block list
> , but I get this error:
>
> opt: BasicBlock.cpp:83: virtual llvm::BasicBlock::~BasicBlock(): Assertion `getParent() == 0 && "BasicBlock still linked into the program!"' failed.
>
> The program completes its task and i get this in the end. I am
2004 Dec 09
2
Peak finding algorithm
I'm sure there must be various peak-finding algorithms out there. Not
knowing of any, I have written one myself*, but I thought I'd ask to
see what's out there.
Basically, I have a 2-dimensional data set and I want to identify local
peaks in the data, while ignoring "trivial" peaks. My naive algorithm
first identifies every peak and valley (point of inflection change
2010 Dec 07
2
Efficient way to use data frame of indices to initialize matrix
I have a data frame with three columns, x, y, and a. I want to create a matrix from these values such that for matrix m:
m[x,y] == a
Obviously, I can go row by row through the data frame and insert the value a at the correct x,y location in the matrix. I can make that slightly more efficient (perhaps), by doing something like this:
> for (each.x in unique(df$x)) m[each.x, df$y[df$x ==
2005 Feb 17
0
[LLVMdev] Branching to Entry block
Thanks a lot for replying.
I have another query.
If branching to the entry block is not legal in llvm how should I be able to create a new entry block for any existing list?
I created a new block and inserted it into the present basic block list , but I get this error:
opt: BasicBlock.cpp:83: virtual llvm::BasicBlock::~BasicBlock(): Assertion `getParent() == 0 && "BasicBlock
2005 Feb 17
0
[LLVMdev] Branching to Entry block
Thanks a lot for replying...but I am not doing any deleting or removing node ...I am trying to insert a "new" entry node in an existing list.
In another reply I understood (also mentioned on the site) that no other block can branch to the entry block.
How do I achieve this ? Is it feasible?Let me know if there is any example.
Thanks again,
Tanu
Chris Lattner <sabre at
2004 Dec 23
2
Get rid of space padding
I'm currently using the below function from some library (MASS?) for
writing my data out to file. I'm using it instead of plain old "write"
because it does buffering. The problem that I'm having is that the
numbers are space padded, but I need true tab-delineated files. It
looks like the spaces are coming from 'format', but I don't see
an option for format to
2007 Nov 26
1
Unweighted meta-analysis
Hello
I'm very much a beginner on meta-analysis, so apologies if this is a
trivial posting. I've been sent a set data from separate experimental
studies, Treatment and Control, but no measure of the variance of effect
sizes, numbers of replicates etc. Instead, for each study, all I have
is the mean value for the treatment and control (but not the SD). As
far as I can tell, this forces