Questions tagged [arrays]
An array is an ordered linear data structure consisting of a collection of elements (values, variables, or references), each identified by one or more indexes. When asking about specific variants of arrays, use these related tags instead: [vector], [arraylist], [matrix]. When using this tag, in a question that is specific to a programming language, tag the question with the programming language being used.
arrays
417,776
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How to count values from a column with JSON content?
I have a table with singers and each singer can be linked to many musical styles.
Musical Styles are in a TEXT column, but the content of the column has JSON format.
I want to count the number of ...
- 6,291
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How do relationships not cause infinite loops?
So I'm still learning SwiftData and the one thing I cannot get my head around is how relationships don't cause infinite loops.
For example, using SwiftData, if you want to list all the films an actor ...
- 655k
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How to return a const char * from a C/C++ function?
I have the following C++ function that reads a string from the flash memory and returns it.
I want to avoid using the String class because this is on an Arduino and I've been advised that the String ...
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R create an array result of cutting (seq) of a data frame
I'm not comfortable with array manipulation (and English writing, sorry ..)
I have this data frame (aa):
aa<-data.frame(replicate(10,sample(0:17,30,rep=TRUE)))
> aa
X1 X2 X3 X4 X5 X6 X7 X8 ...
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C++: array types and new
I'm learning C++. The following program looks nice and generic:
typedef some_type T;
int main() {
T* p = new T;
}
And it indeed works for non-array types like int, etc. However, if I try typedef ...
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How to insert a variable in to a multiline (backtick) string in Go?
I am trying to insert a variable in to a string that I pass in to a byte array. What I want is something like this:
myLocation := "foobar123"
rawJSON := []byte(`{
"level": &...
- 4,349
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8
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create a grid array in JavaScript
I want to setup a grid containing m * n objects. This grid got a width of m rows and n columns.
I tried this code first
let map = [][]; // Create an array that takes a x and y index
function ...
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How can I separate csh array elements with something other than a space?
In a csh script I'm working on I need to have array elements containing spaces, so I need to separate those elements with something other than a space, like a comma. For example, I would like to ...
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1
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type hinting an array
Consider the following minimal example:
from array import array
def foo(arr: array) -> None:
print(arr)
I have a function which takes an array argument.
My project is statically typed and ...
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append to a javascript array from a vb.net timer
I am not best javascript coder but I am familiar with passing an array to javascript from vb.net, but I now have a requirement to append to a javascript array from a vb.net where timer updates some ...
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How to return a 2D array from a function in C?
I am a Ruby programmer who has ended up developing a code generate for C. Its like asking a Limo to tow a 1960s truck. Any way.
Here is what I thought should work but doesnt work.
float[][] pixels()
...
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Extract elements from numpy array, that are not in list of indexes
I want to do something similar to what was asked here NumPy array, change the values that are NOT in a list of indices, but not quite the same.
Consider a numpy array:
> a = np.array([0.2, 5.6, ...
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Filter multideminsional array in PHP so that if certain values are duplicated in sub-arrays the redundant ones are unset [closed]
In an application, redundant but non-identical arrays are being returned. I'd like to remove the redundant arrays from the multidimensional array. Though the issue could possibly be solved closer to ...
- 107k
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Split Javascript array elements into chunks at designated indexes
I have an array like so
const arr = [3,6,9,12,18,21,24,27,33,36];
I want the array arr split into chunks at 12, 21 and 33. That is at the index 3, 5, and 8. I want to produce another array chunks ...
- 22.6k
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Scraping the contents of a javascript variable to a PHP variable?
I have scraped some javascript (using simple_html_dom) and this is what I've come up with...
Contents of $MyScrape
<script type="text/javascript">
var initialInfo = [
[
[29, 30, '...
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