Re: [R] select data

2012-05-14 Thread S Ellison
> From: David L Carlson [dcarl...@tamu.edu] >This overwrites the data so you might want to create a copy first. > > example <- data.frame(V1=c(3, -1), V2=c(-2, 4), V3=c(4, 1)) > tf <- ifelse(example<0, TRUE, FALSE) > example[tf] <- NA > apply(example, 1,

Re: [R] select data

2012-05-14 Thread David L Carlson
on Associate Professor of Anthropology Texas A&M University College Station, TX 77843-4352 > -Original Message- > From: r-help-boun...@r-project.org [mailto:r-help-bounces@r- > project.org] On Behalf Of Andrea Sica > Sent: Monday, May 14, 2012 11:32 AM > To: r-help@r-project

Re: [R] select data

2012-05-14 Thread Andrea Sica
Thank you all. Really! I have used the following function: apply(dfrm, 1, function(x) mean(x[x>=0]) ) Someone of you even gave me a few interesting explanations about why to use it. Still thank you all. Andrea On Mon, May 14, 2012 at 6:52 PM, David Winsemius wrote: > > On May 14, 2012, at 12:

Re: [R] select data

2012-05-14 Thread David Winsemius
On May 14, 2012, at 12:32 PM, Andrea Sica wrote: Dear all, I am sure it won't be difficult for you!! I need to calculate the average among variables for the single units of my dataset. But, while doing it, I need to do not consider some values. To better explain, think like there are two un

Re: [R] select data

2012-05-14 Thread R. Michael Weylandt
This was actually discussed about a week and a half ago with many good solutions offered, but I think the most idiomatic would be something like this: apply(dataset, 1, function(x) mean(x[x>0])) The reasons I like it: i) It uses the apply function to do the same operation row-wise (that's what t

[R] select data

2012-05-14 Thread Andrea Sica
Dear all, I am sure it won't be difficult for you!! I need to calculate the average among variables for the single units of my dataset. But, while doing it, I need to do not consider some values. To better explain, think like there are two units and three variables: V1V2 V3 [1] 3

Re: [R] select data for boxplot

2011-01-10 Thread Peter Ehlers
On 2011-01-10 07:38, David A. wrote: Dear list, havig the following matrix "Value" "Class" 13.001 12.801 11.781 11.702 11.612 11.952 11.552 12.403 11.401 12.271 12.493 11.394 11.804 12.393 12.723 12.183 11.643 11.504 12.81

[R] select data for boxplot

2011-01-10 Thread David A.
Dear list, havig the following matrix "Value" "Class" 13.001 12.801 11.781 11.702 11.612 11.952 11.552 12.403 11.401 12.271 12.493 11.394 11.804 12.393 12.723 12.183 11.643 11.504 12.814 11.314 11.952 12.652