[Numpy-discussion] stacking record arrays

Robert Kern robert.kern@gmail....
Mon Jun 21 13:51:56 CDT 2010


On Mon, Jun 21, 2010 at 13:44, Benjamin Root <ben.root@ou.edu> wrote:
> Hello,
>
> I ran into a somewhat counter-intuitive situation that probably should be
> documented somewhere with respect to record (structured?) arrays.  I wanted
> to stack multiple arrays together that had the same names for the columns.
> Since I was imagining the columns as having the names (as opposed to rows),
> I figured vstack() would do the job, but it merely created a sequence of
> record arrays.  Turns out that I had to use hstack() to get what I wanted.

Remember that your structured arrays are simply 1-D vectors of
records. 1-D vectors are primarily treated as row vectors by things
that care about "horizontal" and "vertical" for all dtypes, both
records and "normal" scalars. It just gets a bit confusing because one
often thinks of 1-D arrays of records as being rows and columns.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless
enigma that is made terrible by our own mad attempt to interpret it as
though it had an underlying truth."
  -- Umberto Eco


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