similar to: Extract only certain rows from a table

Hi, I am extracting data from a table where the rows have different column lengths, and empty columns have NA in them. Whenever I extract a row with some empty columns, the resulting vector carries all the NAs. Is there a way to ignore the empty columns? Thanks, -Nina

Hi, Sorry for the simple question. Is there a way to change the name of only one column of an existing data frame? I know colnames allows you to set the name of all the columns, but only one column in the middle of my data frame needs a new name. Thanks, -Nina

Hi, I have a CSV file where each row has at least 20 columns and some rows have up to 30 columns of data. When I use the command, Pathways<-read.table('MetaCycSample3.csv',sep=',',header=FALSE,quote='"') anything past the 21st column gets kicked down to a new row. How can I fix this? Thanks, -Nina

Hi, I know this must be a stupid question, and sorry in advance for being such a noob. But, is there way to get R to display only certain variables when running a script. I know if you want to see the value of a variable when using the interface, you just type it in and hit enter, but is there a command that I can use in a script file that will show the value at a certain point? Thanks, -Nina

Hi, I have a data frame with strings that have two letters and four numbers. When I store a whole row as a new vector and try to remove the preceding letters using the gsub command, it returns characters of single numbers that have no relation to the numbers in each string. I also noticed that when I view the new vector before using gsub, it includes the original headers from the data frame. For

Hi, I have a table of numbers without any repeats. Is there a function that will search the entire table for a specified value and return the indices if it is found? Also, some rows may have columns without values. Thank you so much, -Nina

Hi, I have a CSV file with various biological reactions. Subscripts, superscripts, and italics are encoded in carats, and I was wondering if R can actually recognize those and print actual superscripts, etc. Here's an example: <i>S</i>-adenosyl-L-methionine + rRNA = <i>S</i>-adenosyl-L-homocysteine + rRNA containing

Hi, I'm using which to find the position of a value in my data table, and it is returning the correct position and the position of another number that differs by an extra decimal place. For example, when I do: where1<-which(Operons==3573.1,arr.ind=TRUE) it returns the position of that number and of 3573.15. Is it possible to get the function to only return a position if the number

Hi, I get the following error when I try to read in a CSV file: > Path<-read.table('MetaCycSample2.csv',sep=',', header=FALSE) Error in scan(file, what, nmax, sep, dec, quote, skip, nlines, na.strings, : line 17 did not have 5 elements Some of the rows have more columns than others. Also when I try the read.csv command, the very last column, which only has one cell

Hi, I don't have too much programming experience - sorry in advance if this question is very basic, and thanks for the help. I have a vector of numbers and another vector of a subset of those numbers. How can I create a third vector with all the numbers in the original list that aren't in the given subset. Like this: List1 subset --> result 1 1 2 2 3 3 4

Hi, I am writing a very long program that deals with multiple large databases which often have missing data cells and other quirks. I've been testing it on small samples of the data so it doesn't take too long, but when I tried it using the real files, it ran for about a minute and then gave me this error message: Error in matrix(unlist(value, recursive = FALSE, use.names = FALSE), nrow

Hi, I am reading in a CSV file of chemical reactions where the subscripts and superscripts are encoded in angle brackets, like below: 2 H<SUP>+</SUP> + 2 O<SUB>2</SUB><SUP>-</SUP> Is there a way to convert these to actual sub/superscripts and save them in another excel file? I greatly appreciate the help! Thanks, -Nina PS. I asked this before, but I

Hi, I'm sorry if this is a simple question. How do you insert a blank row into a data frame? I basically need to do this: old table: new table: C1 C2 C3 C1 C2 C3 1 32 34 1 32 34 2 52 23 54 2 52 23

Hi, I'm looking for a function which returns the name of the argument object as a string: >vect <- 1:3 >function(vect) "vect" I've looked at 'name', 'names', 'objects', none seem to do exactly what I want. ls/objects comes close, but I can't figure out how to force it to give me only one object name. daver

Hi R-users, I have to define a noise level function L and its energy in the various moment of the day by: if time is between 18:00:00 and 23:59:59 then L[j] <- L[j]+5 and W <- 10^((L+5)/10) if time is between 22:00:00 and 05:59:59 ==> L <- L+10 and W <- 10^((L+10)/10) else L=L and W = W Could someone help me to realize this function please? You will find my following

Hi,there, I am using R package "boot" to bootstrap. I have one question here: does anybody possibly know how the boot package generates the "indices" which is used in the statistic function? I thought "indices = sample(data, replace=TRUE)", but when I replaced "indices" with this command and used "boot", I got different results. Specifically,

Hi ? This is giving me a headache. I?m trying to do a relatively simple optimization ? actually trying to approximate the output from the Excel Solver function but at roughly 1000x the speed. ? The optimization parameters look like this. The only trouble is that I want to add a constraint that sum(wgt.vect)=1, and I can?t figure out how to do that in optim. Mo.vect <-

Hello, I have a question regarding subsetting of vectors. Here's an example of what I'm trying to do: vect.1 <- c(76,195, 290, 380) vect.2 <- c(63, 95, 133, 170, 215, 253, 285, 299, 325, 375) I would like to subset vect.2 so that it has the same length as vect.1, and its numbers are the first corresponging higher value compared to vect.1. The output should be: final.output =

Folks; I am having a problem with the cv.glm and would appreciate someone shedding some light here. It seems obvious but I cannot get it. I did read the manual, but I could not get more insight. This is a database containing 3363 records and I am trying a cross-validation to understand the process. When using the cv.glm, code below, I get mean of perr1 of 0.2336 and SD of 0.000139. When using a

I'm trying to use Rprof() to identify bottlenecks and speed up a particullary slow section of code which reads in a portion of a tif file and compares each of the values to values of predictors used for model fitting. I've written up an example that anyone can run. Generally temp would be a section of a tif read into a data.frame and used later for other processing. The first portion