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This channel is intended for people just starting with the Raku Programming Language (raku.org). Logs are available at irclogs.raku.org/raku-beginner/live.html Set by lizmat on 8 June 2022. |
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| habere-et-disper | Hello rakoons -- thanks for all the conference videos ! :-) | 18:39 | |
| What's a clear way of swapping the rows and columns of a two-dimensional array ? It seems it gets messy fast: | 18:40 | ||
| m: my @a=[ [1,1,1],[2,2,2],[3,3,3] ]; say @a[ 0 .. @a.end ; $_ ] for 0 .. @a.head.end; | |||
| camelia | (1 2 3) (1 2 3) (1 2 3) |
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| nemokosch | [Z] might work | 18:49 | |
| the only concern would be whether it cares about containerization or not | 18:50 | ||
| let's see | |||
| m: my @a=[ [1,1,1],[2,2,2],[3,3,3] ]; say [Z] @a; | |||
| Raku eval | ((1 2 3) (1 2 3) (1 2 3)) | ||
| nemokosch | maybe let's mix it up a bit more to see it better | ||
| m: my @a = (1..9).rotor; say @a; say [Z] @a; | 18:51 | ||
| Raku eval | Exit code: 1 Cannot resolve caller infix:«<»(); none of these signatures matches: ($?) (\a, \b) (Real $a, Real $b) (Int:D $a, Int:D $b --> Bool) (int $a, int $b --> Bool) (Num:D $a, Num:D $b --> Bool) (num $a, num $b --> Bool) (Rational:D $a, Rational:D $b --> Bool) (Rational:D $a, Int:D $b --> Bool) (Int:D $a, Rational:D $b --> Bool) (Instant:D $a, Instant:D | ||
| $b --> Bool) (DateTime:D $a, DateTime:D $b --> Bool) (Date:D $a, Date:D $b --> Bool) (Version:D $a, Version:D $b) in block <unit> at main.raku line 1 | |||
| nemokosch | okay, this error message may be LTA... | ||
| m: my @a = (1..9).rotor(3); say @a; say [Z] @a; | 18:52 | ||
| Raku eval | [(1 2 3) (4 5 6) (7 8 9)] ((1 4 7) (2 5 8) (3 6 9)) | ||
| nemokosch | looks good, no? | ||
| habere-et-disper | Yes, thanks ! 👍 | 18:53 | |
| Round tripping works too: | 18:56 | ||
| m: [Z] [Z] ( (1,1,1), (2,2,2), (3,3,3) ) | |||
| camelia | Potential difficulties: Useless use of [Z] in sink context at <tmp>:1 ------> <BOL>⏏[Z] [Z] ( (1,1,1), (2,2,2), (3,3,3) ) |
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| habere-et-disper | m: say [Z] [Z] ( (1,1,1), (2,2,2), (3,3,3) ) | ||
| camelia | ((1 1 1) (2 2 2) (3 3 3)) | ||
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| .ohnowendigo | That [Z] trick is deep magic | 22:51 | |
| nemokosch | reducing with zipping | 23:01 | |
| not sure if &zip has an appropriate signature | |||
| there is some difference with the decontainerisation... | 23:02 | ||
| m: my @a = (1..9).rotor(3); say @a; say zip @a; | 23:03 | ||
| Raku eval | [(1 2 3) (4 5 6) (7 8 9)] (((1 2 3) (4 5 6) (7 8 9))) | ||
| nemokosch | yeah... | ||
| next attempt: flattening the array into arguments | 23:04 | ||
| m: my @a = (1..9).rotor(3); say @a; say zip |@a; | |||
| Raku eval | [(1 2 3) (4 5 6) (7 8 9)] (((1 2 3) (4 5 6) (7 8 9))) | ||
| nemokosch | yeah I think this is good old containers getting in the way | ||
| m: my @a = (1..9).rotor(3); say @a; say zip @a.List; | |||
| Raku eval | [(1 2 3) (4 5 6) (7 8 9)] ((1 4 7) (2 5 8) (3 6 9)) | ||
| nemokosch | seems a lot like that | ||
| for some reason, [Z] removes the containers for the elements of the Array, therefore it will do the right thing | 23:05 | ||
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