8000 dcast.data.table error message is cryptic when forced to cast duplicate rows without sufficient aggregation · Issue #693 · Rdatatable/data.table · GitHub
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dcast.data.table error message is cryptic when forced to cast duplicate rows without sufficient aggregation #693

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ghost opened this issue Jun 12, 2014 · 0 comments
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dcast.data.table error message is cryptic when forced to cast duplicate rows without sufficient aggregation #693

ghost opened this issue Jun 12, 2014 · 0 comments
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@arunsrinivasan
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v1.9.4

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@ghost
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ghost commented Jun 12, 2014

The current error message is this:

Error in dcast.data.table(test.table, as.formula(paste(class.col, "+",  : 
  retFirst must be integer vector the same length as nrow(i)

A replacement candidate recommended by Arun is this:

Error: fun.aggregate should return, for each unique group (from formula's LHS), 
  a length 1 vector, but returns length=2 for a group.

This SO thread has a reproducible example and background describing the issue.
@arunsrinivasan arunsrinivasan self-assigned this Jun 12, 2014
@arunsrinivasan arunsrinivasan added this to the v1.9.4 milestone Jun 19, 2014
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