Re: [Bug-apl] inner product

[Juergen Sauermann]

Hi, that would be more like an outer product:       a←b←5 3⍴⍳8       ⍴a∘.=b 5 3 5 3 The inner product reduces away the two middle axes of the outer product. In the ⍉b case you have       ⍴a∘.=⍉b 5 3 3 5       ⍴a+.=⍉b 5 5 That is, BTW, the reason while the last axis of a and the first axis of b must match; otherwise the right function of . would get a length error. /// Jürgen On 03/17/2017 06:14 PM, enz...@gmx.com wrote: thanks i have no clue how the result of a+.=⍉b as 5x5 result is obtained from a 5x3 array and 3x5 array shouldn't it be a 15x15 result ... but i guess i really just want to use +/a=b :) On Fri, 17 Mar 2017 12:26:42 -0400 Christian Robert <christian.rob...@polymtl.ca> wrote: a+.=⍉b 3 0 0 0 0 0 3 0 0 0 0 0 3 0 0 0 0 0 3 0 0 0 0 0 3 On 2017-03-17 12:17, enz...@gmx.com wrote: Hi what am i missing here? a←b←5 3⍴⍳8 a=b +/a=b a+.=b length error