search for: hesen

Hi all, I wonder if there is a way to create a matrix with two (or even more) column/row names? Thank you very much. Have a nice day. -- ??? Hesen Peng http://hesen.peng.googlepages.com/

...been running my R program on some servers for a while but do not know exactly how R is working. The servers are chained together using Sun Grid Engine. Each node has 8 quad-core CPUs. I wonder how many cores and CPUs are used by a simple single-thread R program. Thanks a lot. Best wishes, -- ??? Hesen Peng http://hesen.peng.googlepages.com/

...m: A(number of lines for group 1) a11 a12 a13 a21 a22 a23 ... B(number of lines for group 2) b11 b12 b13 b21 b22 b23 ... I guess SAS may work pretty well in this kind of situation with data step. But I don't know how to handle them using R. Any suggestions? Thanks a lot. Best wishes, -- ??? Hesen Peng http://hesen.peng.googlepages.com/

...pu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc arch_perfmon pebs bts pni monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr sse4_1 lahf_lm bogomips : 4521.97 clflush size : 64 power management: -- ??? Hesen Peng http://hesen.peng.googlepages.com/

...temp<-temp[temp[,1]>temp[,2],] However, I guess there must be some easier way of doing this. Besides, if inequality condition is applied at the very beginning, this will save me a lot of memory if n goes to a very large number. Is there any suggestions? Thanks a lot. Best wishes, -- ??? Hesen Peng http://hesen.peng.googlepages.com/

...nvex optimization in R. The admissible region is the inside and surface of a multi-dimensional eclipse area and the goal function is the sum of absolution values of the variables. Could any one please tell me whether there's a package in R to do this? Thank you very much, Best wishes, -- ??? Hesen Peng http://hesen.peng.googlepages.com/

...pposed to decrease until reaching zero after a given value. However, most of the value just wander at 10^-8 scale and never shrink exactly to zero. So I guess I should manually add a threshold to set the values to zero. But does anyone know any choice of these thresholds? Thanks very much. -- ??? Hesen Peng http://hesen.peng.googlepages.com/

...having two matrix M and N and a function G, which is a function of two arrays. I want to form a matrix R with dim(R)==c(nrow(M),nrow(N)), and R[i,j] <- G(M[i,], N[j,]). And I wonder whether I may use some functions like outer to the matrix. Thank you very much and have a nice weekend. -- ??? Hesen Peng http://hesen.peng.googlepages.com/

Anyone using or has access to ParallelR? I was looking at the page and found nothing really useful! http://www.revolution-computing.com/sitegenius/topic.php?id=195 I want to see if I can run R on a cluster of workstation, and use batch systems like Grid Engine or Xgrid: http://gridengine.sunsource.net/ http://ww.apple.com/acg/xgrid/ --Chi

...e in R which are good for expressing a tree? The possible idea I'm having in my mind is to represent the whole tree as a list in which a sublist (an element to the main list) contains all its corresponding branches. Is there any simpler way of doing this? Thank you very much. Best wishes, -- Hesen Peng http://hesen.peng.googlepages.com/

After a few days of work, I think I nearly have it. Unfortunately, theta is unchanged after I run this (as a script from a file). I thought that theta would contain the fitted parameters. The goal here is to find the least squares fit according to the function defined as "rss" subject to the constraints defined as ui and ci. I defined ui and ci to (hopefully) force par2 and par3

Hi, I'm wondering if R provide a vi mode in the command line just like other shells such as bash do. Can somebody let me know? Regards, Peng

We have a user here who is attempting to compile a package which requires f90 (gfortran will do). Our version of R was built with f77 (g77). When the user attempts to build the package, f77 is always invoked and fails due to the presence of f90 features. Is there a simple method or some documentation on how to force a package build to use a different compiler than the one used in

I have a program which needs to compute squared Euclidean distance between two vectors million of times, which the Rprof shows is the bottleneck. I wondered if there is any faster way than my own simple function distance2 = function(x1, x2) { temp = x1-x2 sum(temp*temp) } I have searched the R-help archives and can not find anything except when the arguments are matrices. Thanks for any