similar to: How to select randomly from a matrix?

Hello, I am trying to create a function that will move through each record of a data frame, find the value in the "HUC" column, then randomly select another observation from the dataframe with the same value in "HUC" column, as well as the same value in "Yr" column as the first observation. I want the function to produce a list of the RchID of the first observation,

Hi, This is Madhu and I have a following doubt please give a solution... **>i have the following data frame from this i want to select a 80% of data randomly in such a way that if the selected records are 1 and then we have to get the all records corresponding to 1 similarly for 2 also and soon......... help me data<-data.frame(x=c(1,1,2,2,2,3,4,4,4),y=c(23,45,87,46,78,12,87,79));**

Hi all, I have a dataframe of behavioral observations from 360 fish, each with 241 observation points(rows), which looks like this: > head(d) fish treatment tank trial video tid pid ang.chg abs.ac t len vel d2p x y 1 1 3 1 1 1 1 1 NA NA 0.0 0.000 NA NA 5.169 9.617 2

Hello all, I create the following matrix: m <- matrix(1:20, nrow = 10, ncol = 2) which looks like: [,1] [,2] [1,] 1 11 [2,] 2 12 [3,] 3 13 [4,] 4 14 [5,] 5 15 [6,] 6 16 [7,] 7 17 [8,] 8 18 [9,] 9 19 [10,] 10 20 Then, I want to remove randomly 2 rows among the ones where m[,1]<8 and m[,2]>12 I suppose the

Using this data as an example dat <- read.table(textConnection("Id myvar 12 1 12 2 12 6 34 9 34 4 34 8 65 15 65 23"), header = TRUE) closeAllConnections() how can I create another data set that does not have duplicate entries for 'Id', but the included values are randomly selected from the available ones. Thanks! Juliet

Following Duncan's suggestion, I forward the below to R-devel. vQ -------- Original Message -------- Subject: Re: [R] Randomly remove condition-selected rows from a matrix Date: Fri, 02 Jan 2009 10:34:52 -0500 From: Duncan Murdoch <murdoch at stats.uwo.ca> To: Wacek Kusnierczyk <Waclaw.Marcin.Kusnierczyk at idi.ntnu.no> CC: R help <R-help at stat.math.ethz.ch>

Hi, I want to randomly pick 2 fish born the same day but I need those individuals to be from different families. My table includes 1787 fish distributed in 948 families. An example of a subset of fish born in one specific day would look like: >fish fam born spawn 25 46 43 25 46 56 26 46 50 43 46 43 131 46 43 133 46 64 136 46 43 136 46 42 136 46 50 136 46 85 137 46 64 142 46 85 144 46 56

Hello, here is the problem: I want to demonstrate that, on average, the Pearson's correlations of a specified subset of genes from a huge list (>18,000 columns) are higher than any randomly chosen subset of that list. I would therefore like to do a number of tests between that specified subset and randomly chosen ones from the "mother" list. How could I do that? What would be

I have a matrix of ceros, for example: 0 0 0 0 0 0 0 0 0 0 0 0 And I would like that one of these values turn into 1, for example if one condition is got, but not in a concrete position if not randomly. Could you indicate me the code to can get it? Thanks in advance, Judit Barroso

I am trying to select a checkbox that is randomly named depending on the ID assigned to it by the webpage. [9713816764515361h] is the random bit. #<WWW::Mechanize::CheckBox:0x7a2b3c0 @checked=false, @name="communityContentFields[9713816764515361h].postToArea_checkbox", @value="true"> What code should I use to check the box? Thanks Chris

All, I have data that looks like below. For each id there may be more than one value per day. I want to select a random value for that day for that id. The end result would hopefully be a matrix with the id as rows, date as columns and populated by the random hab value. Thanks to someone on here (Jim) I know how to do the matrix, but now realize I need to randomly select some of my values.

Hi dear users, I try to split a matrix into a few matrices, for example, suppose that I have 1000X4 matrix from mvrnorm(1000,m,c) with m<-matrix(c(0,0,0,2),4,1) and c<-matrix(c(1.0,0.2,-0.5,0.3,0.2,1,0.2,-0.5,-0.5,0.2,1,0.2,0.3,-0.5,0.2,1),4,4,byrow=T) How to split the matrix into a. 2 matrices which the first one consists of the first 500 rows, and the second one consist of the

I want to create a randomly generated 25*15 binary matrix knowing what the colSums and rowSums of this matrix should be. colSums(a) [1] 3 7 2 5 0 4 6 5 5 4 3 4 4 5... rowSums(a) [1] 8 6 6 6 6 6 5 5 5 5 4 4 4... . . Baptiste Coulmont coulmont at yahoo.com --------

Hi, I have other information. I analyzed the core dump: (gdb) core 22534 [New LWP 22534] Reading symbols from /usr/libexec/dovecot/doveadm-server...Reading symbols from /usr/lib/debug/usr/libexec/dovecot/doveadm-server.debug...done. done. [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib64/libthread_db.so.1". Core was generated by

Dear all, I have a large dataset (N=100,000 with 89 variables per subject). This dataset is stored in a 100.000 x 89 matrix where each row describes one individual and each column one variable. What is the easiest way of selecting a subset of let's say 1.000 individuals out of that whole matrix? Thanks, Michael Michael Haenlein Associate Professor of Marketing ESCP-EAP European School of

Hi, i have a problem with libclucene-core.so.2.3.3.4. I See segfault error to messages log, when dovecot store mail to INBOX. set 12 13:41:21 box02.par-tec.it kernel: doveadm-server[20285]: segfault at 38 ip 00007f575b68fc42 sp 00007ffc0272e750 error 4 in libclucene-core.so.2.3.3.4[7f575b569000+188000] set 12 13:41:22 box02.par-tec.it kernel: doveadm-server[18871]: segfault at 38 ip

Hi Stephan, thanks for your replay. This is bt full output: (gdb) bt full #0 clear (this=0x0) at /usr/src/debug/clucene-core-2.3.3.4/src/core/CLucene/util/VoidMap.h:123 No locals. #1 lucene::search::FieldSortedHitQueue::_shutdown () at /usr/src/debug/clucene-core-2.3.3.4/src/core/CLucene/search/FieldSortedHitQueue.cpp:60 No locals. #2 0x00007f7dc5eabe96 in _lucene_shutdown () at

Dear all, I'm trying to get a two dimensional embedding of some data using different meythods, among which princomp(), cmds(), sammon() and isoMDS(). I have a problem with sammon() because the coordinates I get are all equal to NA. What does it mean? Why the method fails in finding the coordinates? Can I do anything to get some meaningful results? Thank you very much Domenico

I would like to build a model in R to simulate the seed dispersal by one plant. The plant produced 5 seeds and the probability of falling inside the eight closest space was 0.8 and in the next space 0.2 and in the rest space 0: 0 0 0 0 0 0 0.2 0.2 0.2 0.2 0.2 0 0.2 0.8 0.8 0.8 0.2 0 0.2 0.8 1 0.8 0.2 0 0.2 0.8 0.8 0.8 0.2 0 0.2 0.2 0.2 0.2 0.2 0 0 0 0 0 0 0

Hello, I have Dovecot configured with Solr for the indexes. I have need your support for upgrade solr 7.7.2 to 8.4.1. Solr 7.7.2 has a security issue CVE-2019-12409. It's possible upgrade of Solr? Dovecot work correctly with Solr 8.x? The Solr documentation recommended after updating: "It is always strongly recommended that you fully reindex your documents after a major version