I can see now that the documentation was unclear about this.
I am revising it to add the sentence marked "+":

  I and J are the offsets from the current location (in the X and Y directions,
  respectively) of the center of the circle.
  I and J are optional except that at least one of the two must be used.
+ If only one is specified, the value of the other is taken as 0.
  It is an error if: 
    ...
and similarly for the other planes.

Does this clarify emc's behavior for you, or is it still not clear?

Jeff

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