Dear J Forum: I am applying +/ to arrays that can be of either rank 1 or rank 2. The following approach works fine for rank 2: +/ i. 2 5 5 7 9 11 13 But for a rank 1 array, I want just the array itself. I can do that with +/"_1: +/"_1 i. 5 0 1 2 3 4 However +/"_1 i.2 5 collapses along the wrong axis: +/"_1 i.2 5 10 35 Please show me an efficient summation operator that will leave untouched rank 1 arrays, but will perform +/ on rank 2 arrays. Preferably I will not have to add a leading axis to the rank 1 arrays. Thank you Sincerely,
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