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This question has been spreading like a virus in my office. There are quite a variety of approaches:

Print the following:

        1
       121
      12321
     1234321
    123454321
   12345654321
  1234567654321
 123456787654321
12345678987654321
 123456787654321
  1234567654321
   12345654321
    123454321
     1234321
      12321
       121
        1

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\$\begingroup\$ This doesn't work for me in Dyalog? The ,⍨\1↓⎕d looks right, but adding the mix ↑ just results in 1. If I enclose before mixing, I get something closer, but it's still printed all on one line... \$\endgroup\$

Mark Reed
– Mark Reed

2024-03-06 02:26:09 +00:00
Commented Mar 6, 2024 at 2:26
\$\begingroup\$ @MarkReed what's your ⎕ml? \$\endgroup\$

ngn
– ngn

2024-03-06 09:55:32 +00:00
Commented Mar 6, 2024 at 9:55
\$\begingroup\$ My comment disappeared and I thought it hadn't gone through, or I would have deleted it. Sorry! I thought I had tried different ⎕ml values, but it seems that my first attempt was under ⎕ml = 3; it works under lower levels. \$\endgroup\$

Mark Reed
– Mark Reed

2024-03-06 19:02:57 +00:00
Commented Mar 6, 2024 at 19:02
\$\begingroup\$ Well, it works under ⎕ml = 1; it also fails under ⎕ml = 2. \$\endgroup\$

Mark Reed
– Mark Reed

2024-03-06 19:08:56 +00:00
Commented Mar 6, 2024 at 19:08

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