Grasshopper

algorithmic modeling for Rhino

Extracting Index Numbers

Hi,

If I've filtered a longer list to only those items that satisfy given criteria, how can I output the index numbers of the remaining items?

For example, if I have a 10-item list - 0-9 - and only items 3,4,7,8 return true, how can I return those index numbers (3,4,7,8) in their own list?

Thanks,
Justin

Views: 3887

Replies to This Discussion

Permalink Reply by Andrew Heumann on November 1, 2009 at 1:43pm
Try creating a series that starts at 0, step size 1, with list length as the count, and then using a cull pattern to extract only those numbers corresponding to "true" values.
Permalink Reply by J Short on November 1, 2009 at 2:09pm
Hey, thanks for your response Andrew. That seems to do the trick.

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