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rloopsfor-loopstata
Said Hassan
Said Hassan

Reputation: 1

R for loop - Importing csv and exporting graphs

I have some csv files with data I want to plot in R. Right now I read each file manually, do some calculations and then plot a graph for each file. However, since I want to do exactly the same with all the data files i am trying to figure out how to do it in a for loop.

Let's say I have a folder, 'myfolder', with the files: data1.csv, data2.csv, data3.csv and I want to export the data as figure1.png, figure2.png and figure3.png.

The data files have the exact same variables just with different values.

In stata I would do it like this: 

glo dir "C:/.../myfolder" 
forvalues x = 1/3 {
    import delimited using $dir/data`x'.csv, clear
    ** some calculations ** 
    graph two scatter Y X 
    graph export $dir/figure`x'.png, replace 
}

What would be the equivalent to that in R?

Upvotes: 0

Views: 244

Answers (1)

Fr.
Fr.

Reputation: 2885

Something like that should work:

f <- "C:/path/to/folder/"
for (i in 1:3) {
  d <- read.csv(file.path(f, paste0("data", i, ".csv")))
  # compute stuff
  png(file.path(f, paste0("figure", i, ".png")))
  plot(x, y)
  dev.off()
}

Check the documentation for file.path and plot to make sure that this is what you need.

Upvotes: 2

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