Displaying 20 results from an estimated 1000 matches similar to: "Poly-phase Filters in R"
2011 Sep 05
1
capturing a figure to PDF or Image
Hello,
I've been using jpeg(), bmp() and pdf() to capture plots.
I've used the parameter "at" in a plot, to define the tickmarks.
It works fine on screen, but when I try to print it to a file, it gives a
warning:
"at" is not a graphical parameter
and prints an empty figure. Can you help?
Thanks,
Eran.
[[alternative HTML version deleted]]
2011 Aug 30
1
R-Studio Question
Hello,
I've switched to R studio from the StatET Eclipse plug-in.
I have a question regarding navigating between plots.
When I use x11() or windows() new devices are created and I know how to
switch back and forth between them.
However, when I plot on the device that stands for R-Studio's built-in plot
browser, is there a way to switch back between plots? Each new "plot"
2011 Sep 12
5
completing missing samples
Hello,
I have a time-series that has some missing samples.
I was thinking on completing them using either zero-order hold or linear
interpolation.
I am looking for an efiicient way (other than a loop...) of identifiying the
missing time slots and filling them.
Can you think of any methods that might help here? (obviously
which(diff(time)>min(diff(time))) will give the locations, but what
2011 Aug 24
2
debugging functions in R
Hi,
I am not sure if this is the right list to ask this question (though I did
not find a more appropriate one).
I've started using R a month ago, and small scripts work fine. However, when
I start writing more complex code, it gets messy.
1. Is there any way to debug "normally", with breakpoints?
2. I am using the Eclipse plugin (StatET), and tried JGR(). Is there an IDE
that
2011 Sep 01
1
Namespace in packages
Hello,
I wonder how I might create a package that only reveals some of the function
in the package to the user.
I've tried creating an R package using the following:
f <- function(x,y) x+y
g <- function(x,y) x-y
h <- function(x,y) f(x,y)*g(x,y)
package.skeleton(list=c("f","g","h"), name="mypkg")
and would like only h() to be available when I
2011 Aug 21
1
How to navigate (zoom, pan) in a plot/graph
Hello all,
I need to zoom in and out and "travel"(pan) inside a plot, like you can do
on a Matlab plot.
If possible, I would also like the option to use the mouse to set a marker
on the graph and get the (x,y) data for it, again, like in Matlab.
Is this possible in R with the regular packages, or do you maybe know a
different package that will allow this?
Eran.
*
*
[[alternative
2011 Aug 24
1
Passing a large amount of parameters to a function
Hello,
I have a function with a long list of parameters (of different types,
numeric and string)
myFunc <-function(p1, p2, p3, p4, p5...etc)
{
do.something(p1,p2,....)
}
I want to loop over this to provide a different set of parameters to the
list every time.
for (ii in 1:N)
{
myFunc(p1(ii), p2(ii),....etc)
}
I would like to simplify the notation and use some kind of structure, maybe
2011 Oct 19
1
using a dictionary in R
Hi all,
Is there a way to create a "dictionary" in R, such that it has <key,value>
pairs?
Something to the effect of:
x=dictionary(c("Hi","Why","water") , c(1,5,4))
x["Why"]=5
In truth I'm looking two categorial variables function.
So that if x=dictionary(c("a","b"),c(5,2))
x val 1 a 5 2 b 2
I want to compute
2007 Feb 06
0
convolve: request for "usual" behaviour + some improvements + some fixes
To add to the wish-list for "convolve":
For modeling processes that decay exponentially in time, e.g.,
fluorescence, it is desirable to have a function that convolves an
arbitrary vector with an exponential using an iterative method.
In the TIMP package (which won't be on CRAN till R 2.5.0 is official, but
is for now at www.nat.vu.nl/~kate/TIMP) we implemented this
special-purpose
1999 Nov 18
1
convolve bug?
I have been experimenting with convolve().
What I know about convolution I learned from engineering (they call this
stuff linear systems theory), not statistics, so maybe this is all just a
matter of different conventions. BUT I notice very weird things with
convolve().
1. First example, from the classic Bracewell The Fourier transform and its
applications, chap 3 (p.32 in 2nd edition):
{2 2 3 3
2012 Mar 15
4
replicating C example from the Extensions Manual problem
Dear R People:
Here is something that I am sure is very simple. I'm just trying to
re-create the C convolution example in the Extensions manual. Here is
the subroutine:
void convolve(double *a, int *na, double *b, int *nb, double *ab)
{
R_len_t i, j, nab = *na + *nb - 1;
for(i = 0; i < nab; i++)
ab[i] = 0.0;
for(i = 0; i < *na; i++)
for(j = 0; j < *nb; j++)
ab[i + j] += a[i] *
2011 Aug 11
1
.C and .Call: convolve example not working
Dear R users,
I want to call C code via the .C or .Call interface. This works fine
with integer values but using doubles the array received in C will be
set to zeros.
I have tried the convolve examples (Writing R extensions, chapter 5.2)
and still the resulting array consists of zeros.
My code (shortened for my purposes. Original did not work either):
2005 Jul 20
2
Issues with convolve
We obtained some disturbing results from convolve() (inaccuracies and negative
probabilities). We'll try to make the context clear in as few lines as
possible...
Our function panjer() (code below) basically computes recursively the
probability mass function of a compound Poisson distribution. When the
Poisson parameter lambda is very large, the starting value of the recursive
scheme ---
2005 Oct 26
1
Borland C++ and [R] dyn.load() for windows
Hi,
I compiled a C program file on Borland C++ 5.5 compiler to get one dll output
(as instructed in the file readme.package).
The C program file is just the example on page 31 of "writing R extensions":
void convolve(double *a, int *na, double *b, int *nb, double *ab)
{
int i, j, nab = *na + *nb - 1;
for(i = 0; i < nab; i++)
ab[i] = 0.0;
for(i = 0; i < *na; i++)
for(j = 0; j
2007 Feb 02
1
Inaccuracy in ?convolve
Hi,
Man page for 'convolve' says:
conj: logical; if 'TRUE', take the complex _conjugate_ before
back-transforming (default, and used for usual convolution).
The complex conjugate of 'x', of 'y', of both?
In fact it seems that it takes the complex conjugate of 'y' only which
is OK but might be worth mentioning because (1) conj=TRUE is the
2013 Apr 11
2
[LLVMdev] Migration from JIT to MCJIT
Submitted to bugzilla as PR 15729
From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] On Behalf Of Kaylor, Andrew
Sent: Thursday, April 11, 2013 1:13 PM
To: Weiss, Eran
Cc: llvmdev at cs.uiuc.edu
Subject: Re: [LLVMdev] Migration from JIT to MCJIT
Thanks, Eran.
I’m not sure how soon I’ll have a solution for you, but it’s on my to-do list now. I’ll also create a bugzilla
2013 Jun 23
1
stats::convolve documentation enhancement
Hi,
the function stats::convolve does not mention efficient usage of the
underlying FFT algorithm, such as
(a) if type="circular", then length(x)=length(y) should have many
factors (e.g. length(x) = length(y) = 2^n)
(b) if type="open" or "filter", then length(x)+length(y)-1 should have
many factors (e.g. length(x)+length(y)-1 = 2^n)
In particular the latter may
2011 May 18
1
Convolution confusion:
Hi,
I'm new to R, and I'm a bit confused with the "convolve()" function.
If I do:
x<-c(1, 2, 3)
convolve(x, rev(x), TRUE, "open")
= 9 12 10 4 1
But I expected: 3 8 14 8 3 (like in Octave/MATLAB - conv(x, reverse(x)) )
3 2 1 x 1 2 3
= 3 2 1
0 6 4 2
0 0 9 6 3
= 3 8 14 8 3
The thing is, that "convolve(x, x, TRUE, "open")" works.
For me
2007 Dec 19
1
strange timings in convolve(x,y,type="open")
Dear R-ophiles,
I've found something very odd when I apply convolve
to ever larger vectors. Here is an example below
with vectors ranging from 2^11 to 2^17. There is
a funny bump up at 2^12. Then it gets very slow at 2^16.
> for( i in 11:20 )print( system.time(convolve(1:2^i,1:2^i,type="o")))
user system elapsed
0.002 0.000 0.002
user system elapsed
0.373
2013 Apr 11
0
[LLVMdev] Migration from JIT to MCJIT
Thanks, Eran.
I’m not sure how soon I’ll have a solution for you, but it’s on my to-do list now. I’ll also create a bugzilla record for this problem.
-Andy
From: Weiss, Eran [mailto:Eran.Weiss at emc.com]
Sent: Thursday, April 11, 2013 12:40 AM
To: Kaylor, Andrew
Cc: llvmdev at cs.uiuc.edu; Jim Grosbach; Jiong Wang
Subject: Re: [LLVMdev] Migration from JIT to MCJIT
Andrew,
I've attached