snap

objarray snap <obj> <value> <tolerance> <index_start> <index_increment>

To modify the values that are closed to <value>, within <tolerance. <index_start> and <index_increment> allow to jump some indices

<obj> an objarray with x y z values to be modified

<value> a real number

<tolerance> a real number>0

<index_start> integer>=0 (usually 0)

<index_increment> to jump indices (usually 1)

A scenario could be to set z=0 in an obj with values {x y z ... x y z}, to loop only on z values the index_start=2 and the index_increment=3

e.g.

set obj [objarray new doublearray -values {10.0 0.001 0.8 1.5 -5.02 0.0000004}]
objarray snap $obj 0.0 1e-4 2 3
-> 10.0 0.001 0.8 1.5 -5.02 0.0