* [ruby-core:82326] [Ruby trunk Bug#13797] Using .push on an 2d array class-instance variable causes the whole array to be overwritten with the .push value; is this a bug?
[not found] <redmine.issue-13797.20170810113904@ruby-lang.org>
@ 2017-08-10 11:39 ` pike.jc
2017-08-10 11:51 ` [ruby-core:82327] [Ruby trunk Bug#13797][Rejected] " nobu
2017-08-11 1:53 ` [ruby-core:82341] [Ruby trunk Bug#13797] " nobu
2 siblings, 0 replies; 3+ messages in thread
From: pike.jc @ 2017-08-10 11:39 UTC (permalink / raw
To: ruby-core
Issue #13797 has been reported by gggfx (James Pike).
----------------------------------------
Bug #13797: Using .push on an 2d array class-instance variable causes the whole array to be overwritten with the .push value; is this a bug?
https://bugs.ruby-lang.org/issues/13797
* Author: gggfx (James Pike)
* Status: Open
* Priority: Normal
* Assignee:
* Target version:
* ruby -v: ruby 2.2.6p396 (2016-11-15 revision 56800) [x64-mingw32]
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
----------------------------------------
I was building a class to hold results for analysis 'cells' in a model; each 'cell' is a position in an array, with each result stored in a sub-array - this collates multiple results per cell which can then be iterated through later for model interactions.
I created this as a class (my data is addressed by time,x,y and z coordinates; my class writers and readers convert t-x-y-z into a position on a 1d array, this is faster than named instance variables).
When it comes to pushing the data into the instance array variable it causes *all* the slots of the array to be pushed with the value.
This is my first bug report and I'm newish to Ruby so I apologise if I've missed any key information. I attach code with a test-example I wrote which demonstrates the behaviour in question.
## NORMAL CASE
**testArray** = [[],[],[],[],[]]
**testArrayShouldLookLike** = [[*result1*],[],[],[],[]]
**testArrayCanThenLookLike** = [[*result1*, *result2*],[],[],[],[]] etc.
## CLASS CASE
**def** write(position, data)
@testArray[position].push(data)
**end**
**testArrayComesOutAs** = [[*result1*],[*result1*],[*result1*],[*result1*],[*result1*]]
---Files--------------------------------
Class bug_JP.rb (1.13 KB)
--
https://bugs.ruby-lang.org/
^ permalink raw reply [flat|nested] 3+ messages in thread
* [ruby-core:82327] [Ruby trunk Bug#13797][Rejected] Using .push on an 2d array class-instance variable causes the whole array to be overwritten with the .push value; is this a bug?
[not found] <redmine.issue-13797.20170810113904@ruby-lang.org>
2017-08-10 11:39 ` [ruby-core:82326] [Ruby trunk Bug#13797] Using .push on an 2d array class-instance variable causes the whole array to be overwritten with the .push value; is this a bug? pike.jc
@ 2017-08-10 11:51 ` nobu
2017-08-11 1:53 ` [ruby-core:82341] [Ruby trunk Bug#13797] " nobu
2 siblings, 0 replies; 3+ messages in thread
From: nobu @ 2017-08-10 11:51 UTC (permalink / raw
To: ruby-core
Issue #13797 has been updated by nobu (Nobuyoshi Nakada).
Description updated
Status changed from Open to Rejected
You share the same array instance as sub-arrays.
```ruby
def initialize(totalSize)
@data_array = Array.new(totalSize,[])
end
```
Make different instances.
```ruby
@data_array = Array.new(totalSize) {[]}
```
or
```ruby
@data_array = [[]] * totalSize
```
----------------------------------------
Bug #13797: Using .push on an 2d array class-instance variable causes the whole array to be overwritten with the .push value; is this a bug?
https://bugs.ruby-lang.org/issues/13797#change-66127
* Author: gggfx (James Pike)
* Status: Rejected
* Priority: Normal
* Assignee:
* Target version:
* ruby -v: ruby 2.2.6p396 (2016-11-15 revision 56800) [x64-mingw32]
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
----------------------------------------
I was building a class to hold results for analysis 'cells' in a model; each 'cell' is a position in an array, with each result stored in a sub-array - this collates multiple results per cell which can then be iterated through later for model interactions.
I created this as a class (my data is addressed by time,x,y and z coordinates; my class writers and readers convert t-x-y-z into a position on a 1d array, this is faster than named instance variables).
When it comes to pushing the data into the instance array variable it causes *all* the slots of the array to be pushed with the value.
This is my first bug report and I'm newish to Ruby so I apologise if I've missed any key information. I attach code with a test-example I wrote which demonstrates the behaviour in question.
## NORMAL CASE
```ruby
testArray = [[],[],[],[],[]]
testArrayShouldLookLike = [[result1],[],[],[],[]]
testArrayCanThenLookLike = [[result1, result2],[],[],[],[]] etc.
```
## CLASS CASE
```ruby
def write(position, data)
@testArray[position].push(data)
end
testArrayComesOutAs = [[result1],[result1],[result1],[result1],[result1]]
```
---Files--------------------------------
Class bug_JP.rb (1.13 KB)
--
https://bugs.ruby-lang.org/
^ permalink raw reply [flat|nested] 3+ messages in thread
* [ruby-core:82341] [Ruby trunk Bug#13797] Using .push on an 2d array class-instance variable causes the whole array to be overwritten with the .push value; is this a bug?
[not found] <redmine.issue-13797.20170810113904@ruby-lang.org>
2017-08-10 11:39 ` [ruby-core:82326] [Ruby trunk Bug#13797] Using .push on an 2d array class-instance variable causes the whole array to be overwritten with the .push value; is this a bug? pike.jc
2017-08-10 11:51 ` [ruby-core:82327] [Ruby trunk Bug#13797][Rejected] " nobu
@ 2017-08-11 1:53 ` nobu
2 siblings, 0 replies; 3+ messages in thread
From: nobu @ 2017-08-11 1:53 UTC (permalink / raw
To: ruby-core
Issue #13797 has been updated by nobu (Nobuyoshi Nakada).
nobu (Nobuyoshi Nakada) wrote:
> ```ruby
> @data_array = [[]] * totalSize
> ```
Sorry, this doesn't fix it. Use `Array.new` with a block.
----------------------------------------
Bug #13797: Using .push on an 2d array class-instance variable causes the whole array to be overwritten with the .push value; is this a bug?
https://bugs.ruby-lang.org/issues/13797#change-66134
* Author: gggfx (James Pike)
* Status: Rejected
* Priority: Normal
* Assignee:
* Target version:
* ruby -v: ruby 2.2.6p396 (2016-11-15 revision 56800) [x64-mingw32]
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
----------------------------------------
I was building a class to hold results for analysis 'cells' in a model; each 'cell' is a position in an array, with each result stored in a sub-array - this collates multiple results per cell which can then be iterated through later for model interactions.
I created this as a class (my data is addressed by time,x,y and z coordinates; my class writers and readers convert t-x-y-z into a position on a 1d array, this is faster than named instance variables).
When it comes to pushing the data into the instance array variable it causes *all* the slots of the array to be pushed with the value.
This is my first bug report and I'm newish to Ruby so I apologise if I've missed any key information. I attach code with a test-example I wrote which demonstrates the behaviour in question.
## NORMAL CASE
```ruby
testArray = [[],[],[],[],[]]
testArrayShouldLookLike = [[result1],[],[],[],[]]
testArrayCanThenLookLike = [[result1, result2],[],[],[],[]] etc.
```
## CLASS CASE
```ruby
def write(position, data)
@testArray[position].push(data)
end
testArrayComesOutAs = [[result1],[result1],[result1],[result1],[result1]]
```
---Files--------------------------------
Class bug_JP.rb (1.13 KB)
--
https://bugs.ruby-lang.org/
^ permalink raw reply [flat|nested] 3+ messages in thread
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[not found] <redmine.issue-13797.20170810113904@ruby-lang.org>
2017-08-10 11:39 ` [ruby-core:82326] [Ruby trunk Bug#13797] Using .push on an 2d array class-instance variable causes the whole array to be overwritten with the .push value; is this a bug? pike.jc
2017-08-10 11:51 ` [ruby-core:82327] [Ruby trunk Bug#13797][Rejected] " nobu
2017-08-11 1:53 ` [ruby-core:82341] [Ruby trunk Bug#13797] " nobu
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