Re: [Bug-apl] Simple division question

[David Tran]

haha... I need go back to elementary school.

Thanks,

David

On Thu, May 19, 2016 at 11:12 PM, Elias Mårtenson <address@hidden> wrote:

This is because 2÷m will result in division by zero. You can see that 2÷1+m works fine, since that prevents any zeros in the divisor.

Regards,

Elias

On 20 May 2016 at 11:07, David Tran <address@hidden> wrote:

Hi,

vector × or ÷ scalar

scalar × or ÷ vector

are all expected result. ( as scalar duplicate to same shape as vector )

One higher rank to matrix,

matrix × scalar

scalar × matrix

are all expected result.

matrix ÷ scalar is OK too,

but scalar ÷ matrix got no "expected" result and error... why?

~~~~~~~~

      2 × 3 4
6 8
      3 4 × 2
6 8
      2 ÷ 3 4
0.6666666667 0.5
      3 4 ÷ 2
1.5 2
      m ← 3 3⍴1,3⍴0
      m
1 0 0
0 1 0
0 0 1
      m × 2
2 0 0
0 2 0
0 0 2
      2 × m
2 0 0
0 2 0
0 0 2
      m ÷ 2
0.5 0   0
0   0.5 0
0   0   0.5
      2 ÷ m
DOMAIN ERROR
      2÷m
      ^ ^

Thanks,

Dave