[R] 2D Convolution in R

Dear R-Helpers, I want to try the 2D (two-dimensional) convolution in R. For example, let us we have the following kernel and data. kernel - (1,2,3,2,1) data - array(1:100, dim=c(10,10)) I know the function 'convolve' only for one-dimensional convolution, but it is just for a 1D sequence. Is

[R] 2D Convolution Function

. Is there any function for 2D convolution? For theory, please refer to the following link: http://www.songho.ca/dsp/convolution/convolution2d_example.html Thank you for your help in advance. Best Regards, Wonsang - Wonsang You Leibniz Institute for Neurobiology -- View this message in context

[R] 2D Convolution Function

. Is there any function for 2D convolution? For theory, please refer to the following link: http://www.songho.ca/dsp/convolution/convolution2d_example.html Thank you for your help in advance. Best Regards, Wonsang - Wonsang You Leibniz Institute for Neurobiology -- View this message in context

Re: [R] Simulation of Multivariate Fractional Gaussian Noise and Fractional Brownian Motion

results. Kjetil On Tue, Feb 8, 2011 at 1:51 PM, Wonsang You y...@ifn-magdeburg.de wrote: Dear R Helpers, I have searched for any R package or code for simulating multivariate fractional Brownian motion (mFBM) or multivariate fractional Gaussian noise (mFGN) when a covariance matrix

Re: [R] Large Datasets

I have not ever tried to use any GUI package. Thus, I cannot give you a good help. Instead, I would like to report my experience of exploiting the 'ff' package to have access to large dataset. To achieve your goal, I think that you need to make any function which handles ff objects. According to

[R] Simulation of Multivariate Fractional Gaussian Noise and Fractional Brownian Motion

for multivariate FBM and FGN simulation? Thank you for your help. Best Regards, Ryan - Wonsang You Leibniz Institute for Neurobiology -- View this message in context: http://r.789695.n4.nabble.com/Simulation-of-Multivariate-Fractional-Gaussian-Noise-and-Fractional-Brownian-Motion

[R] Error of 'memory not mapped' in ff Package with VirtualBox

: exit R without saving workspace 4: exit R saving workspace Selection: Can anyone give an advice to solve the problem? Best Regards, Ryan - Wonsang You Leibniz Institute for Neurobiology -- View this message in context: http://r.789695.n4.nabble.com/Error-of-memory-not-mapped-in-ff-Package

Re: [R] Error of 'memory not mapped' in ff Package with VirtualBox

Extensions') to get more info on the cause: at least run under gdb to get more precise info on what was not mapped. You don't say what the host OS of VirtualBox was. We've found I/O under VirtualBox with a x86_64 Linux host to be slow, but R to run reliably. On Wed, 2 Feb 2011, Wonsang You

Re: [R] Fast Two-Dimensional Optimization

Dear Dave, Thank you for your recommendation. I looked over the website of AD Model Builder for fast optimization. I want to ask you whether the software can be used in R programming as a kind of R package? Or is there any possibility that it can be jointly used with R packages? Regards, Wonsang

Re: [R] Fast Two-Dimensional Optimization

de Wonsang You Enviado el: lunes, 22 de noviembre de 2010 16:17 Para: r-help@r-project.org Asunto: [R] Fast Two-Dimensional Optimization Dear R Helpers, I have attempted optim function to solve a two-dimensional optimization problem. It took around 25 second to complete

[R] Fast Two-Dimensional Optimization

, Wonsang - Wonsang You Leibniz Institute for Neurobiology -- View this message in context: http://r.789695.n4.nabble.com/R-Fast-Two-Dimensional-Optimization-tp3053782p3053782.html Sent from the R help mailing list archive at Nabble.com. [[alternative HTML version deleted

[R] Cross Spectral Analysis

analysis? Thank you. Best Regards, Wonsang - Wonsang You Leibniz Institute for Neurobiology -- View this message in context: http://r.789695.n4.nabble.com/Cross-Spectral-Analysis-tp3046999p3046999.html Sent from the R help mailing list archive at Nabble.com. [[alternative HTML version

Re: [R] How to fix error in the package 'rgenoud'

is the list of control parameters in optim (For details, refer to http://sekhon.berkeley.edu/stats/html/optim.html). boundary.enforcement prevents the algorithm from going away from the boundary. On 13 October 2010 15:01, Wonsang You [via R] ml-node+2993619-1186574920-137...@n4.nabble.comml-node

[R] How to fix error in the package 'rgenoud'

, wait.generations=3) Then, I had the following error message. Error in solve.default(Djl) : system is computationally singular: reciprocal condition number = 0 Can anyone give me some tip on how to fix the problem? Thank you for your great help in advance. Best Regards, Wonsang You

Re: [R] How to fix error in the package 'rgenoud'

(BFGSburnin), as.integer(transform), PACKAGE = rgenoud) 3: genoud(Qmin, nvars = 2, starting.values = InitVal, max.generations = 10, wait.generations = 3, n = n, yper = yper, pertype = pertype) at wFGN.R#75 On 13 October 2010 13:03, Wonsang You y...@ifn-magdeburg.de wrote: Dear R user fellows, I

Re: [R] How to fix error in the package 'rgenoud'

), as.integer(BFGSburnin), as.integer(transform), PACKAGE = rgenoud) 3: genoud(Qmin, nvars = 2, starting.values = InitVal, max.generations = 10, wait.generations = 3, n = n, yper = yper, pertype = pertype) at wFGN.R#75 - Wonsang You Leibniz Institute for Neurobiology -- View this message

[R] How to combine matrix and vector

15 Then, I want to combine a and b as follows. c= 12345 6789 10 11 12 13 14 15 If you teach me to easily combine the matrix and the vector, I will greatly appreciate you. Thank you. Regards, Wonsang - -- Wonsang You Special Lab Non-Invasive Brain

Re: [R] How to uncompress a gz file in R

Dear Henrik and Steven, Thank you for your kind help and guidance even though it is a basic question. I misunderstood that gunzip is a part of not R.utils but utils. I could find out the function in R.utils. Then, it was successful to decompress any gz file as follows. library(R.utils)

Re: [R] How to combine matrix and vector

] [,4] [,5] [1,] 11 12 13 14 15 rbind(a,b) [,1] [,2] [,3] [,4] [,5] [1,]12345 [2,]6789 10 [3,] 11 12 13 14 15 - -- Wonsang You Special Lab Non-Invasive Brain Imaging Leibniz Institute for Neurobiology http://www.ifn-magdeburg.de

Re: [R] How to uncompress a gz file in R

2010/9/14 Uwe Ligges lig...@statistik.tu-dortmund.de: See ?gzfile Uwe Ligges On 14.09.2010 11:02, Wonsang You wrote: Dear Fellows, I would like to know how to uncompress a gz file at the R console. I could not find out any help from the R-help archive. Thanks for your great

[R] How to uncompress a gz file in R

Dear Fellows, I would like to know how to uncompress a gz file at the R console. I could not find out any help from the R-help archive. Thanks for your great help. Best Regards, Wonsang You - -- Wonsang You Special Lab Non-Invasive Brain Imaging Leibniz Institute for Neurobiology http

[R] How to Adaptively Set Up the Coordinate Range of Multiple Graphs in One Figure

of data, in order to include all data in the figure. Thank you for your great help and contribution. Best Regards, Stephen You - -- Wonsang You Special Lab Non-Invasive Brain Imaging Leibniz Institute for Neurobiology http://www.ifn-magdeburg.de -- View this message in context: http://r.789695