Question #271877 on Yade changed:
https://answers.launchpad.net/yade/+question/271877
Status: Open => Answered
Jérôme Duriez proposed the following answer:
Do the provided error message and script really match ??
Your script seems to express "idx" according to "a", whereas the error message
shows an "idx" expression according to "spherePos".....
Exception of the name difference, one should visibly have one index: "a[0]",
whereas spherePos should have two: "spherePos[i,0]"...
As an of-topic remark "for i in range(len(O.bodies)): b = O.bodies[i]" may
be directly replaced by "for b in O.bodies:". See any example of the doc, e.g.
in https://yade-dem.org/doc/tutorial-data-mining.html#local-data
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