On 07/10/2015 21:22, William Dunlap wrote:
I just noticed that read.table() and type.convert() interpret the string "i"
as a missing value of type complex.
> str(read.table(text=c("i\ni\ni\ni\n")))
'data.frame': 4 obs. of 1 variable:
$ V1: cplx NA NA NA ...
> str(type.convert("i"))
cplx NA
If there are other strings in the column it makes the column character so
most people will not notice
> str(read.table(text=c("i\nii\niii\niv\n")))
'data.frame': 4 obs. of 1 variable:
$ V1: Factor w/ 4 levels "i","ii","iii",..: 1 2 3 4
Is this intended? It surprised me.
It was intended (that input is ambiguous), but it is being changed ....
from the NEWS file for R-devel:
• type.convert("i") now returns a factor instead of a complex value
with zero real part and missing imaginary part.
--
Brian D. Ripley, rip...@stats.ox.ac.uk
Emeritus Professor of Applied Statistics, University of Oxford
1 South Parks Road, Oxford OX1 3TG, UK
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