All Questions
291
questions
0
votes
1
answer
15
views
Modify the values in a (global) list of dictionary without reference
I'm new to python - being an educator trying to write to python script to score student's performance downloaded from an online polling platform. I've solved most problems until something like this: I'...
- 1
0
votes
1
answer
102
views
C# double.Parse TextBox from List in another Class is always '0' or 'NaN'
Let's start with the intended workflow:
A List of textboxes is created in Class1 and added into a Panel.
The List is called in Class2 to use double.Parse with the user inputs in Windows Forms.
A ...
0
votes
1
answer
39
views
How does the value of an untouched integer change here? [duplicate]
This really, really messed with me today. This is the most minimum working example I could get:
array = [ 1, 2, 1, 3, 4 ]
n = 3 ...
- 1,183
0
votes
1
answer
104
views
How to count references in java correctly?
I have difficulties understanding how to correctly count a reference variables.
Example (adopted from some book for java learning):
class Car {
}
class Example {
public static void main(String[] ...
1
vote
2
answers
87
views
Confusion when defining a list of array refs as constant
In some Perl code I'm doing some low-level coding accessing Perl constants that are lists, like this:
use constant LIST => ()
As Perl constants are actually implemented as functions, I'm trying ...
- 4,069
0
votes
2
answers
54
views
I'm curious about python list's initialization and reference
Let me make a list and change one element like this:
list = [float("inf")] * 3
list[2] = 0
then I print it, It prints
print(list)
> [inf, inf, 0]
I thought each element references the ...
- 21
0
votes
1
answer
37
views
Python lists always assign reference not value
I want to copy list values to another list because I modify the original one and use the new one. Bu t whatever I try it will alwasy assign reference not value.
class Chromosome:
def __init__(...
- 2,206
0
votes
0
answers
23
views
Reassigning variables in Python: garbage collector vs manual erase efficiency [duplicate]
What is the best practice when reassigning object variables, to maximise memory and CPU efficiency?
We all know object variables do not actually "contain" the object data, but they're just ...
- 49
0
votes
2
answers
37
views
Why are the results different depending on how to assign?
When I tried to reverse the Linked list, I noticed that the results varied depending on how I did the assignments.
Why does it happen as bellow?
class ListNode:
def __init__(self, val=0, next: ...
0
votes
1
answer
52
views
Why two reference of the same list behave like if they are two deep copy even if not?
In my architecture, i have business object (BO from now on), that return a standard result of type OperationResult<some_generic_type> so that each BO result is provided with instrumented ...
- 1,352
-3
votes
1
answer
47
views
Why doesn't list change?
In Python:
b = []
a = np.arange(2)
b.append(a)
a = np.arange(4)
b.append(a)
print(b) # gives [array([0, 1]), array([0, 1, 2, 3])]
Why doesn't it give [array([0, 1, 2, 3]), ...
1
vote
0
answers
52
views
How to copy a list with reference so the changes to the copied version also apply to the original one in C++?
In my homework I have to make the FooCl class for these:
int main()
{
int x[] = {2, 3, 7, 9, 21, 11, 54, 91};
FooCl<int> itemsI(x, sizeof(x) / sizeof(x[0]));
std::string s[] = {&...
- 99
0
votes
1
answer
61
views
Why am I getting a copy instead of a reference when flattening a list of ndarrays?
And how do I get references to each element in the ndarrays?
The goal is to take a list of variable shaped ndarrays containing primitives, use ravel() on all the ndarrays and merge them into a list ...
- 882
0
votes
3
answers
540
views
Retrieving values from an ArrayList of IntArrays
So I know I'm missing something obvious, however, after searching similar/related questions, I can't quite figure out what I'm doing wrong.
New to Kotlin, so probably something I'm not understanding ...
- 3,316
0
votes
2
answers
80
views
I'm trying to understand how reference works in python
After line 7, I haven't written a single line of code which mentions the list named 'outer'. However, if you execute it, you'll see that the 'outer' (i.e, the nested lists inside it) list would change/...
