The "limma" package (by Gordon Smyth et al). The last option consists of using the function lumns() that comes with
READ CSV RSTUDIO INSTALL
The third option consists of using the very handy function () thatĬomes with the package "colbycol" (by Carlos Gil) # remember to install colbycol require ( colbycol ) # read desired columns tmp3 = ( "some_file.csv", just.read = c ( 1, 3, 7 ), sep = "," ) # convert to a ame df3 = as.ame ( tmp3 ) Option 4: package limma
# read columns 1 to 3 df2a = read.csv ( pipe ( "cut -f1-3 -d',' some_file.csv" )) # read columns 1, 3 and 7 df2b = read.csv ( pipe ( "cut -f1,3,7 -d',' some_file.csv" )) Option 3: package colbycol It consists of calling a cutĬommand but this time from the pipe() function, which in turn is contained The second option is similar to the first one. # collect columns 1, 3 and 7 tmp1 = system ( "cut -f1,3,7 -d',' some_file.csv", intern = TRUE ) # remove extra quotation marks tmp1 = gsub ( "\"", "", tmp1 ) # split by commas (this returns a list) list1 = strsplit ( tmp1, "," ) Option 2: cut and pipe The best solution if what you want is a data frame, but it can do the trick if you The only “problem” is that the data will be stored in a vector. # id12 L December 22 1 6.374395 darkslategra圓 Option 1: cut and systemĬommand with the desired columns, and calling this command within the system()įunction. # id9 I September 19 0 9.969363 darkgreen For instance, a dataset like the following one: # create toy dataset dataset = ame ( Id = paste ( "id", 1 : 12, sep = "" ), Name = toupper ( letters ), Month = month.name, Num = 11 : 22, Qty = sample ( 0 : 3, 12, replace = TRUE ), Val = 10 * runif ( 12, 0.5, 1 ), Col = colors () ) # save data in csv file write.csv ( dataset, "some_file.csv", row.names = FALSE ) # Id Name Month Num Qty Val Col Toy exampleįor this post let’s consider a toy dataset of 12 rows and 7 columns in csv Having to use a data base management system (DBMS) and SQL queries. How can you do that in R? I’ll show you four different ways to do that without Sometimes you just want to read some columns, do some data manipulation, and plot some
READ CSV RSTUDIO HOW TO
by columns Posted on June 23, 2012Įver wonder how to read a file in R by columns? This question comes to mind when yourĪnalysis doesn’t require to import all the data in R, especially if the file is huge.
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