[R] Simple column selection question- which and character lists

Dear R-list, Seems simple but have tried multiple approaches, no luck. I have a list of column names:

[R] jpeg device loop problem

Dear R gurus, Trying to loop a graphing function and output a jpeg file each loop. It works fine for a single run (ie. not looping) but when I loop the output is nothing but white space. Here is my code, somewhat abridged: { rest of loop jpeg(filename=name for this loop.jpeg)

[R] simple anova question

Dear R group, Simple anova question: I am attempting to recreate a figure (from chapter 10 of Mordern Statistics for the Life Sciences, chapter 10, figure 10.8). It is an interaction diagram plotting BYIELD (continuous) as a function of BSPACING (categorical) with different lines/colours for

[R] Help with by

Searched for by in forums and no hits, should be simple problem. This is my line: bio.mean-by(Data,Plot, function(x) mean(AbvBioAnnProd)) I want to calculate the mean of AbvBioAnnProd in each Plot. What am I doing wrong? Thanks in advance, -AL -- View this message in context:

[R] Noobie ANOVA intercept question

Dear R list, I've been attempting to interpret the results from a three-way ANOVA. I think I understand contrasts and the R defaults for these (treatment contrasts). My question is: what is the intercept in this test? As far as I can tell, its NOT the expected value of a point that belongs to the

[R] XYplot simple question

Hello R friends, Simple question today: I am desiring to do an xyplot with the below code, which graphs time series across different experimental Plots- xyplot(AbvBioAnnProd~Year|Plot)### Plots each monoculture biomass vs time xyplot(AbvBioAnnProd~Year|Plot,panel=function(x,y){

Re: [R] Another newbie question

(Sp.presence)[x==1],collapse=,))}) Yay! -Allen AllenL wrote: Problem: I have a data frame with 1s and 0s denoting presence/absence of species (columns) for particular plot measurements (rows). What I want to do is make a new column whose entries for each row is a list of the column names in which

[R] Two Noobie questions

1. I have a list of lm (linear model) objects. Is it possible to select, through subscripts, a particular element (say, the intercept) from all the models? I've tried something like this: List[[1:length(list)]][1] All members of the list are similar. My goal is to have a list of the intercepts

Re: [R] Two Noobie questions

, AllenL wrote: 1. I have a list of lm (linear model) objects. Is it possible to select, through subscripts, a particular element (say, the intercept) from all the models? I've tried something like this: ?coef if your list of models is ml, then perhaps something like this partially