When i make a data frame in R, e.g. like this:

x <- data.frame(sum=c(0.00, 0.00, 1363.31, 27663.58, 27663.58), ID=1:5)

I can save it with write.csv

write.csv(x, "x.csv")

But when i open the x.csv file in arcmap it reads the three last numbers in x$sum as < Null >. Why is this, and is there a way to ensure that ArcMap reads numbers correctly?

A workaround is to open it in excel and save it as a worksheet, but there has to be an easier way.

I dont think its the decimal separator - when I open it in notebook it looks like this:



It isn't an R issue, is how your PC interprets decimal symbol. If you have a different decimal symbol than ., you'll get NULL value in ArcMap:


Go to Control Panel/Regional and Language Options/Format tab and change decimal separator. An useful configuration is:

  • Decimal symbol: .
  • Digit grouping symbol: ,
  • List separator: ,

After apply configuration, open again ArcMap and import .csv again, you'll get:

enter image description here

| improve this answer | |
  • My settings were already as you suggest. So its not that. Is there a decimal separator option in ArcMap? – Jeppe Olsen Jan 11 '17 at 14:25
  • No, ArcMap takes local regional and language settings. Try changing language to "English (United States)", then apply and restart ArcMap. – aldo_tapia Jan 11 '17 at 15:07
  • I changed the language, but its still not working. I have started creating the shapefiles in R instead, but would be nice to be able to do both without having to open the file in excel and and saving it as a worksheet. – Jeppe Olsen Jan 16 '17 at 7:16

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