C#•5mo ago

Array exception

I can't for the life of me figure out this exception. ive identified that it comes from neurons because of it not actually appending the jagged array. Im sure this is something im misunderstanding with C#, maybe something with ownership?

13 Replies

Unknown User•5mo ago

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Jimmacle•5mo ago

what you're missing is .Append doesn't mutate the source collection, it produces an enumerable that represents the contents of that collection with the appended item at the end C# arrays can't be resized automatically, if you want that behavior use Lists with .Add instead

UvuvwevweOnyetenye•5mo ago

im translating that ot mean its something like python, where 99.9% of functions to change things return the changed value that you then set the original variable equal to

Jimmacle•5mo ago

in this specific case with .Append, yes that method is part of LINQ which is a collection of functions to filter/map collections

UvuvwevweOnyetenye•5mo ago

i c so would i have a list of lists of neurons

Jimmacle•5mo ago

yes

UvuvwevweOnyetenye•5mo ago

aight bet

Jimmacle•5mo ago

lists are essentially arrays but they automatically get bigger when you add items

UvuvwevweOnyetenye•5mo ago

c++ equiv of vector

Jimmacle•5mo ago

yeah

UvuvwevweOnyetenye•5mo ago

and then arrays are basically the same between c# and c++ at least in application dubs

i like chatgpt•5mo ago

In C++, array cannot be assigned directly to another array.

// c++
int p[] = { 1,2 };
int q[2];
// q = p; // Error
memcpy(q, p, sizeof(p));

// c++
int p[] = { 1,2 };
int q[2];
// q = p; // Error
memcpy(q, p, sizeof(p));

But in C#, it is ok.

// c#
int[] p = {1, 2};
int[] q = p;

// c#
int[] p = {1, 2};
int[] q = p;

Jimmacle•5mo ago

it would be a more realistic comparison to use pointers and C# references are more like pointers than stack allocated variables

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Array exception