A sub-array is a subset of an array.
Questions tagged [sub-array]
434 questions
90
votes
6 answers
In Swift, Array [String] slicing return type doesn't seem to be [String]
I'm slicing an array of strings and setting that to a [String] variable, but the type checker is complaining. Is it a possible compiler bug?
var tags = ["this", "is", "cool"]
tags[1..<3]
var someTags: [String] = tags[1..<3]
Liron Shapira
- 1,967
- 1
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- 17
27
votes
1 answer
How to get a subArray from Swift 2.0
I keep trying to search for the proper way to get a sub array in Swift but I am missing something here. This code doesn't work because rowArray.append(row) throws an error that states.
Cannot convert value of type 'ArraySlice' to specified…
Skyler Lauren
- 3,792
- 3
- 18
- 30
20
votes
1 answer
How to use MPI_Type_create_subarray?
It is clear that its arguments are:
int MPI_Type_create_subarray(
int ndims,
int array_of_sizes[],
int array_of_subsizes[],
int array_of_starts[],
int order,
MPI_Datatype oldtype,
MPI_Datatype *newtype
);
However, I cannot understand…
Pippo
- 1,543
- 3
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- 40
16
votes
2 answers
How to properly return part of ArrayList in Java?
I have a class SomeClass with a static member myMap enter code herethat has the form HasmMap> which gets de-serialized from a file.
I have a method
public ArrayList getList(final String key, final int…
I Z
- 5,719
- 19
- 53
- 100
14
votes
4 answers
Group row data by one column value and populate a subarray in each group with the other column value
I want to group the data in an array with associative rows. Group should be determined by the type value and all label_id values within each group should be formed into a subarray.
Sample input:
$array = [
['type' => 'AAA', 'label_id' =>…
408
- 161
- 1
- 1
- 4
13
votes
7 answers
Julia: does an Array contain a specific sub-array
In julia we can check if an array contains a value, like so:
> 6 in [4,6,5]
true
However this returns false, when attempting to check for a sub-array in a specific order:
> [4,6] in [4,6,5]
false
What is the correct syntax to verify if a specific…
Nicky Feller
- 3,539
- 9
- 37
- 54
13
votes
2 answers
R array manipulation
In python lists can be sliced like this x[4:-1] to get from the fourth to the last element.
In R something similar can be accomplished for vectors with x[4:length(x)] and for multidimensional arrays with something like x[,,,,4:dim(x)[5],,,]. Is…
momeara
- 1,341
- 2
- 17
- 29
12
votes
3 answers
Maximizing a particular sum over all possible subarrays
Consider an array like this one below:
{1, 5, 3, 5, 4, 1}
When we choose a subarray, we reduce it to the lowest number in the subarray. For example, the subarray {5, 3, 5} becomes {3, 3, 3}. Now, the sum of the subarray is defined as the sum of…
AvinashK
- 3,309
- 8
- 43
- 94
10
votes
1 answer
Filter a 2D numpy array
I want to have a sub array (between min and max) of a numpy 2D ndarray
xy_dat = get_xydata()
x_displayed = xy_dat[((xy_dat > min) & (xy_dat < max))]
min and max are float in order to be compare with the first value of the array…
reynum
- 125
- 1
- 1
- 7
7
votes
4 answers
Two dimensional arrays and pointers
I have the following code snippet:
char board[3][3] = {
{'1','2','3'},
{'4','5','6'},
{'7','8','9'}
};
printf("address of board : %p\n", &board);
printf("address of…
intex0075
- 115
- 1
- 7
7
votes
1 answer
Subarray from NSMutableArray
I have a NSMutableArray with many objects.
Can i extract a subarray from index range 'i' to 'j' directly?
Yeah i know i can do a loop and use objectAtIndex:x and extract each object to a new.
I need to call a method which input is an array and want…
Jorge Vega Sánchez
- 7,430
- 14
- 55
- 77
7
votes
3 answers
Numpy unique 2D sub-array
I have 3D numpy array and I want only unique 2D-sub-arrays.
Input:
[[[ 1 2]
[ 3 4]]
[[ 5 6]
[ 7 8]]
[[ 9 10]
[11 12]]
[[ 5 6]
[ 7 8]]]
Output:
[[[ 1 2]
[ 3 4]]
[[ 5 6]
[ 7 8]]
[[ 9 10]
[11 12]]]
I tried convert…
Petr
- 113
- 1
- 7
7
votes
5 answers
How to extract all possible matching arrays of objects from one array of objects?
I have an array of objects, e.g.
var arr = [
{"a": "x"},
{"b": "0"},
{"c": "k"},
{"a": "nm"},
{"b": "765"},
{"ab": "i"},
{"bc": "x"},
{"ab": "4"},
{"abc": "L"}
];
Let's say I am only interested in objects whose…
lyrically wicked
- 1,185
- 12
- 26
7
votes
9 answers
Find the first occurrence/starting index of the sub-array in C#
Given two arrays as parameters (x and y) and find the starting index where the first occurrence of y in x. I am wondering what the simplest or the fastest implementation would be.
Example:
when x = {1,2,4,2,3,4,5,6}
y = {2,3}
result
…
Jeff
- 13,079
- 23
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- 102
6
votes
1 answer
Taking views of views allocate in Julia
I noticed that taking views of non-"fast linear indexed" subarray allocates, while this is possible on classical vectors.
Any idea, how to make this allocation free?
Here is an illustration of the behavior:
function temp!(lin::Vector{Int},…
Tanj
- 442
- 2
- 9