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Richard
Richard
9:12 AM
Question related to 2014-P7 https://problems.tryapl.org/psets/2014.html?goto=P7_Revolutionary_Thinking
If the stationary circle is 5 and the rotating one 10, it needs two revolutions, is it? I'm asking because the test of my solutions tells me it is just one revolution. But with one revolution the circles are not in the same starting position.
 
Adám
Adám
@Richard Right, two revolutions, which is what the example shows too, right?
 
Richard
Richard
@Adám Yes for 10 {} 5, but for 5 {} 10 my solution alos gives 2, and the test field says it should be 1.
Result should have been 1 with (5) as left argument and (10) as right argument
 
Adám
Adám
A single rotation of the 10 will traverse the circumference of the 5 twice.
 
Richard
Richard
ah :) rotating the circle itself, not one rotation around the stationary circle :)
 
Adám
Adám
Yes.
 
Richard
Richard
9:22 AM
back to the drawing board, thanks!
 
 
6 hours later…
Paul Mansour
Paul Mansour
2:55 PM
If I want the names of the user defined functions and operators that make up a derived function, is taking the representation and parsing the first line of each item the most direct way to do it? In other words, something along the lines of: 
{1↓⍵↑⍨⍵⍳'←'}¨⊃¨⎕NR'f'
Assume dfns and dops
 
Adám
Adám
Assuming they all have names.
 
Paul Mansour
Paul Mansour
3:12 PM
They will. Thanks.
 
Adám
Adám
@PaulMansour It may have a deeper nested structure.
 
Paul Mansour
Paul Mansour
You mean if one of the functions is itself derived?
 
Adám
Adám
Yeah.
 
Paul Mansour
Paul Mansour
OK, thanks.
 
Adám
Adám
@PaulMansour Like this: 
      Sum←{+⌿⍵}
      Count←{≢⍵}
      Div←{⍺÷⍵}
      f←(Sum Div Count)Div Count
      ⎕NR'f'
┌─────────────────────────────────────────┬────────────┬─────────────┐
│┌────────────┬────────────┬─────────────┐│┌──────────┐│┌───────────┐│
││┌──────────┐│┌──────────┐│┌───────────┐│││ Div←{⍺÷⍵}│││ Count←{≢⍵}││
│││ Sum←{+⌿⍵}│││ Div←{⍺÷⍵}│││ Count←{≢⍵}│││└──────────┘│└───────────┘│
││└──────────┘│└──────────┘│└───────────┘││            │             │
│└────────────┴────────────┴─────────────┘│            │             │
 
Paul Mansour
Paul Mansour
3:59 PM
Thanks!
Also, when analyzing ⍺⍺ and ⍵⍵, one needs to assign them to another name. Is that just a fundamental issue with ⍺⍺, etc, or could that be addressed?
 
Adám
Adám
4:15 PM
@PaulMansour I don't we'll address it, as the modern way is using ⎕ATX: 
      Sum←{+⌿⍵}
      Sum{⎕NR'⍺⍺' ⋄ ⍺⍺}⍬



      Sum{61⎕ATX'⍺⍺' ⋄ ⍺⍺}⍬
┌──────────┐
│ Sum←{+⌿⍵}│
└──────────┘
 
Kamila Szewczyk
Kamila Szewczyk
@Adám you should add it to aplcart
⎕nr on the other hand is the top hit
search for source code of doesn't give ATX sadly
 
Adám
Adám
I tend to wait a bit after release before changing things into using new functionality.
 
Paul Mansour
Paul Mansour
4:32 PM
@Adám Ah, excellent, thanks.
 
 
4 hours later…
Adám
Adám
8:17 PM
Even more APL merch, including caps, travel cups, badges, etc. now available.
3
 

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