Filter a list of points

I'm working on daylight analysis using Diva for Grasshopper, as you see in the picture I get a list of illuminance values on pre-set nodes. I'm going to use Galapagos to determine the best configuration possible, for the fitness function I need to calculate the number of nodes that have illuminance value that is less than 500 lux. How do I do that ?

I'm pretty sure this is simple to accomplish in Grasshopper, but because I'm still a beginner I'm having hard time figuring out how to do this.

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Permalink Reply by Lukasz on April 21, 2014 at 6:06pm

I have no idea how you calculate illuminance in terms of geometry, therefore cannot say whether it is applicable to simply split your sample nodes into two lists: above/below. However, if it is, there is no need in using any evolutionary solver, you can just create a loop with two lists: values fulfilling criteria/values above limit. If not, the use of galapagos is the solution, but definitely it is gonna be heavy.... (in terms of your processor capacity)

hope that helps,

Lukasz

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