search for: ralph79

...a Ph: 61 (02) 6249 9899 Fax: 61 (02) 6249 9956 email: jin.li at ga.gov.au -------------------------------------------- -----Original Message----- From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Prof Brian Ripley Sent: Thursday, 24 January 2008 12:05 To: Ralph79 Cc: r-help at r-project.org Subject: Re: [R] Problems with XP32-"3GB-patch"?/ Worth upgrading to Vista X64? On Wed, 23 Jan 2008, Ralph79 wrote: > > Dear R-Users, > > as I will start a huge simulation in a few weeks, I am about to buy a new > and fast PC. I have noticed, t...

....au >> -------------------------------------------- >> >> >> -----Original Message----- >> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On >> Behalf Of Prof Brian Ripley >> Sent: Thursday, 24 January 2008 12:05 >> To: Ralph79 >> Cc: r-help at r-project.org >> Subject: Re: [R] Problems with XP32-"3GB-patch"?/ Worth upgrading to Vista >> X64? >> >> On Wed, 23 Jan 2008, Ralph79 wrote: >> >>> >>> Dear R-Users, >>> >>> as I will start a huge si...

Dear R-users, I am working on a problem that I am currently not able to solve efficiently. It is about multiplying one column of a matrix with only a certain number of rows of another matrix. Let me illustrate my problem with an example: n.obs = 800 n.rowsperobs = 300 n.param = 23 Designmat = matrix(rnorm(n.obs*n.rowsperobs*n.param),ncol=n.param) Betamat =

Dear R-Users, as I will start a huge simulation in a few weeks, I am about to buy a new and fast PC. I have noticed, that the RAM has been the limiting factor in many of my calculations up to now (I had 2 GB in my "old" system, but Windows still used quite a lot of virtual memory), hence my new computer will have 4 GB of fast DDR2-800 RAM. However, I know that 1.) Windows 32 bit cannot

Dear R-Users, I am currently looking for a way to test the equality of two correlations that are related in a very special way. Let me describe the situation with an example. - There are 100 respondents, and there are 2 points in time, t=1 and t=2. - For each of the respondents and at each of the time points, I have information on 10 X-variables and on 10 Y-variables. - Based on this

Dear R-Users, I am working on an Hierarchical Bayes model and tried to replace the inner for-loop (which loops over a list with n.observations elements) with truely vectorized code (where I calculated everything based on ONE dataset over all respondents). However, when comparing the performance of the two alternatives, I found out that the code with the for-loop actually was faster! In order to