10000 "Can't assign to column" error when converting factor columns to lists. · Issue #936 · Rdatatable/data.table · GitHub
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"Can't assign to column" error when converting factor columns to lists. #936

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richierocks opened this issue Nov 9, 2014 · 1 comment
Closed

"Can't assign to column" error when converting factor columns to lists. #936

richierocks opened this issue Nov 9, 2014 · 1 comment
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@arunsrinivasan
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bug
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v1.9.6

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@richierocks
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Converting a character column to a list works as expected:

DT <- data.table(
  x = c("a", "b c", "d e f")
)
DT[, x := strsplit(x, " ")]

I thought that converting a factor would behave in the same way, but it throws an error:

DT <- data.table(
  x = factor(c("a", "b c", "d e f"))
)
DT[, x := strsplit(as.character(x), " ")]
## Error in `[.data.table`(DT, , `:=`(x, strsplit(as.character(x), " "))) : 
##   Can't assign to column 'x' (type 'factor') a value of type 'list' (not character, factor, integer or numeric)

Assigning to a different column name works OK:

DT[, y := strsplit(as.character(x), " ")]

A workaround is possible using a two-stage conversion:

DT[, x := as.character(x)]
DT[, x := strsplit(x, " ")]
@arunsrinivasan
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@richierocks, thanks!

@arunsrinivasan arunsrinivasan self-assigned this Jan 28, 2015
@arunsrinivasan arunsrinivasa 5221 n added this to the v1.9.6 milestone Jan 28, 2015
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