I need to extract many columns from a dataset. I have a very large csv file with thousands of columns and rows, and I read it into R using:
mydata <- read.csv(file = "file.csv",header = TRUE,sep = ",",row.names = 1)
Each column is a gene name. I know how to extract specific columns from my R data.frame by using the basic code like this:
dataset[ , "GeneName1", "GeneName2"]
But my question is, how do I pull hundreds of gene names? Too many to type in? They are listed in a txt file. I'm new, so please go easy on jargon and abbreviations.