$ 3 3&(0:;._3) i. 4 4 2 2 2 1 The shape should be 2 2, methinks.
I have asked for an operation to be applied to 3x3 subarrays of the operand; each result returns a scalar, so the result should be rank 2, shape 2 2. The interpreter has treated it as if I had written 3 3 2&(0:;._3) which would be applying the verb to 3x3x2 subarrays. But if I had wanted that, I should have written it. By omitting the trailing axes I should be indicating that I want to take them in full, and their structure (which might include several axes) should disappear from the result. The Dictionary does not speak to this point, but I think my suggestion here is better than the current design. As it is I have to know how many axes should be left and discard the surplus. Henry Rich ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
