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Dear R users: I have an elementary question: how to creat a vector of [A1, A2, A3...... A300]? I know c(1:300) would give 1, 2, 3, ...., 300 but not sure how to attch a A to each element...

Dear R users -- I think this question was asked before but there was no reply to it. I would appreciate any suggestion any of you might have. I am interested in plotting several "implicit functions" (F(x,y,z)=0...

Dear R Users Does anyone know how to read a text with a specific format? I know that has to do with two functions: read.table and sprintf but not sure how to put them together. Say that I have...

Dear R users -- I have a simple question that I cannot find the answers in the archive email: how to plot a multivariate function if I know the coefficients already? For instance, if I like to plot a 3D fig...

Hi guys; I want to write some text at the first line of an output file. The output file will be used for other software. In particular, the following text "ampl.tab 2 1" needs to be added to the...

Dear R users; Is there a function in R that I can put "text" with proper alignments in a fixed format. For instance, if I have three fields: A, B and C, where both A and C are text with...

Dear R users: I'm trying to generate a output file with fixed format using function "sprintf" in R. However, the execution time in R is very long even the toy data (smaller size df) seems to work fine. The...

Dear R users: I'm trying to use "boot" function under the package boot to run some bootstrapping. Basically, I have a df as follows. (The data is simplified for illustrative purpose.) V1 V2 V3 1 2 3 4 5...

Dear R users: My question is how to write output in a specific formate with irregular spacing? Say that I have the following DF with three columns (A-C): A B C a10 100.0 212 The objective is to...

Dear R users: I have a data frame as follows, where e1-e3 are indicator variables with value equal 0 or 1. St County e1 e2 e3 1 2 1 0 0 1 2 0 1 0 2 1 0...

Dear Helpers: I'm trying to use packages "maps" and "mapdata" (see blow) to display the research resutls on map (Mid-Atlantic region). In particular, I need to mark a number of points in the map by giving their latitude...

Dear R folks: I wonder anyone has a elegent way of doing what I need to do. I have a data frame called with four columns: V1, V2, A1 and A2: V1 V2 A1 A2 A B 1.2 2...

Dear R users; A follow-up question regarding writing to a file with fixed precision: Assuming for each column of x, I would like to have a different format, then I modify the code as: x.fmt <- apply(x, 1...

Dear Folks: My recent question concerning split data.frame has been solved using both following approaches. (Question is listed at the end.) solution 1: Try melt from the reshape package (by Gabor) library(reshape) melt(DF, 1:2) You may...