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, address@hidden 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 <address@hidden> 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, address@hidden wrote:

Hi

what am i missing here?

a←b←5 3⍴⍳8

a=b

+/a=b

a+.=b     length error