How to read numbers in scientific notation in R

Question

I want to read a data file into R. The data format is 4e20.5 in Fortran style.

         -0.12652E-03         0.18851E-03         0.91379E-04         0.20404E-04

If possible, please show me how to get the numbers with read.table function. Any answer will be appreciated.

Answer 1

Posting as an answer rather than a comment for formatting reasons: if your file really has just this text, read.table() should work fine (as pointed out in the comments), eg:

read.table(text=" -0.12652E-03         0.18851E-03         0.91379E-04         0.20404E-04")
##            V1         V2         V3         V4
## 1 -0.00012652 0.00018851 9.1379e-05 2.0404e-05

All we can do is speculate that there is something odd about the separators in your file. Without a link to the file, we probably can't do more than speculate.

Note that the print formatting has changed (eg -0.12652E-03 is now printed as -0.00012652), but the numbers are read correctly (see ?options and search for scipen ).

Answer 2

请原谅我对 R 的无知。现在我解决了这个问题：

 data <- read.fwf("data.txt",width=rep(20,4))