error equality component

anyone can help me, why i cant get the correct result of equality component? i tried to compare both of the list which are clearly have the same value. and ive tried list index component but still have the same problem :(

Replies to This Discussion

Permalink Reply by David Rutten on June 3, 2012 at 4:54am

Hi Azan,

you're going to have to post some files so people can reproduce the problem.

Note that equality of floating point values is a finicky business as even the tiniest difference will result in inequality. I.e. 4.62938576298003 is not equal to 4.62938576298005, even though both may be displayed as 4.629386 in the Grasshopper interface.

If you want to test floating point numbers for equality, you almost always have to compute the absolute difference and compare that to a tolerance that makes sense for you. So instead of 'A = B', you need something along the lines of 'Abs(A-B) < 1e-8'

Points and Vectors suffer from the same problem because they consist of 3 floating points values each.

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by azan on June 5, 2012 at 12:45pm