Paul,
It's not a bug: complex column types aren't yet supported.
If you'd like 'complex' support please file a feature request. If you
can gather support and provide examples of useful applications, then
that will help bump its priority up.
Matthew
On 03.12.2012 11:03, Paul Metzner wrote:
Dear all,
I guess I found a bug in data.table. I have a data frame with complex
numbers which I'd like to convert to a data table for aggregation.
Most things work, for instance:
> head(d)
Fz Cz Pz item
1: 0.002+0i 0.005+0i 0.054+0i 182
2: 1.567+0i 2.263+0i 1.547+0i 182
3: 0.314+0i 1.159+0i 3.841+0i 182
4: 0.507+0i 3.026+0i 6.783+0i 182
5: 2.086+0i 4.051+0i 1.159+0i 182
6: 0.344+0i 0.033+0i 2.282+0i 182
The data type is also ok:
> str(d)
Classes ‘data.table’ and 'data.frame': 128256 obs. of 4 variables:
$ Fz : cplx 0.002+0i 1.567+0i 0.314+0i ...
$ Cz : cplx 0.005+0i 2.263+0i 1.159+0i ...
$ Pz : cplx 0.054+0i 1.547+0i 3.841+0i ...
$ item: int 182 182 182 182 182 182 182 182 182 182 ...
- attr(*, ".internal.selfref")=<externalptr>
When I just call the object, I don't get head and tail as usually but
the following message:
> d
Error in rbindlist(allargs) : Unsupported column type 'complex'
and when I want to set a key column for merging, I get:
> setkeyv(d, c("item"))
Error in setkeyv(d, c("item")) :
don't know how to reorder type 'complex' of column 1. Please send
this message to datatable-help
So that's what I did. Am I doing something wrong here or is this just
a bug?
Best,
Paul
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