[#100309] How to use backport custom field — Jun Aruga <jaruga@...>
Please allow my ignorance.
9 messages
2020/10/06
[#100310] Re: How to use backport custom field
— "NARUSE, Yui" <naruse@...>
2020/10/06
IkJhY2twb3J0IGN1c3RvbSBmaWVsZCIgaXMgb25seSBhdmFpbGFibGUgZm9yIHRpY2tldHMgd2hv
[#100311] Re: How to use backport custom field
— Jun Aruga <jaruga@...>
2020/10/06
On Tue, Oct 6, 2020 at 4:44 PM NARUSE, Yui <[email protected]> wrote:
[#100314] Re: How to use backport custom field
— "NARUSE, Yui" <naruse@...>
2020/10/06
VGhhbmsgeW91IGZvciBjb25maXJtYXRpb24uCkkgY2hlY2tlZCBhZ2FpbiBhbmQgdG8gZWRpdCBi
[#100322] Re: How to use backport custom field
— Jun Aruga <jaruga@...>
2020/10/07
On Tue, Oct 6, 2020 at 7:25 PM NARUSE, Yui <[email protected]> wrote:
[#100326] Re: How to use backport custom field
— "NARUSE, Yui" <naruse@...>
2020/10/07
SSBhZGRlZCB5b3UgdG8gIlJlcG9ydGVyIiByb2xlIGluIHRoZSBwcm9qZWN0CgoyMDIw5bm0MTDm
[#100327] Re: How to use backport custom field
— Jun Aruga <jaruga@...>
2020/10/07
On Wed, Oct 7, 2020 at 1:42 PM NARUSE, Yui <[email protected]> wrote:
[ruby-core:100471] [Ruby master Feature#17277] Make Enumerator#with_index yield row and col indices for Matrix
From:
grzegorz.jakubiak@...
Date:
2020-10-21 10:07:10 UTC
List:
ruby-core #100471
Issue #17277 has been reported by greggzst (Grzegorz Jakubiak).
----------------------------------------
Feature #17277: Make Enumerator#with_index yield row and col indices for Matrix
https://bugs.ruby-lang.org/issues/17277
* Author: greggzst (Grzegorz Jakubiak)
* Status: Open
* Priority: Normal
----------------------------------------
Currently this code seems to be counting index based on the internal array of arrays and it's not correct for the matrix which should return row and col indices
```
Matrix[[0,2,3,4], [6,7,8,9], [1,4,5,8]].each.with_index { |e, index| print "#{index} " } ; puts
0 1 2 3 4 5 6 7 8 9 10 11
=> nil
```
I'm aware of the fact that you could do following and you get the correct results:
```
Matrix[[0,2,3,4], [6,7,8,9], [1,4,5,8]].each_with_index { |e, row, col| print "[#{row}, #{col}] " } ; puts
[0, 0] [0, 1] [0, 2] [0, 3] [1, 0] [1, 1] [1, 2] [1, 3] [2, 0] [2, 1] [2, 2] [2, 3]
=> nil
```
You can even chain `each_with_index` with other enumerators and access indices within them e.g.
```
Matrix[[0,2,3,4], [6,7,8,9], [1,4,5,8]].each_with_index.filter_map { |e, row, col| [row, col] if e % 4 == 0}
=> [[0, 0], [0, 3], [1, 2], [2, 1], [2, 3]]
```
However, I feel we should override `with_index` for Matrix so it returns row and col indices.
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