[vtk-developers] Intersecting tables

[Timothy Shead]

On 10/12/10 8:25 AM, Kerr, Robert wrote:
> I have a table, one column of which has the name “foo” which consists of
> a random set of numbers e.g. {1, 2, 3, 6, 7, 45, 344, etc.}.
>
> I have another table (call it the selection), which has one column,
> whose entries are a subset of “foo” e.g. {1, 7, 344}.
>
> Is there a quick and easy way to get the rows corresponding to the
> selection? I know I can loop through one table and check for existence
> in the other table, but perhaps that’s already been written somewhere
> and I’m just too dense to find it.

Bob:

If your selection was encoded as a vtkSelection, your could use 
vtkExtractSelectedRows.  If you don't want to turn your second table 
into a vtkSelection, use vtkBasicProgrammableFilter to implement the 
loop instead.  The work is roughly the same either way.

Cheers,
Tim


-- 
Timothy M. Shead
Sandia National Laboratories
1424, Data Analysis and Visualization