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Is there a performance impact when calling ToList()?
...lt;T> collection) constructor. This constructor must make a copy of the array (more generally IEnumerable<T>), otherwise future modifications of the original array will change on the source T[] also which wouldn't be desirable generally.
I would like to reiterate this will only make a dif...
Creating a Pandas DataFrame from a Numpy array: How do I specify the index column and column headers
I have a Numpy array consisting of a list of lists, representing a two-dimensional array with row labels and column names as shown below:
...
What does %w(array) mean?
...bar) is a shortcut for ["foo", "bar"]. Meaning it's a notation to write an array of strings separated by spaces instead of commas and without quotes around them. You can find a list of ways of writing literals in zenspider's quickref.
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shared_ptr to an array : should it be used?
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With C++17, shared_ptr can be used to manage a dynamically allocated array. The shared_ptr template argument in this case must be T[N] or T[]. So you may write
shared_ptr<int[]> sp(new int[10]);
From n4659, [util.smartptr.shared.const]
template<class Y> explicit shared_ptr(Y...
Is string in array?
...irst shot at it. But perhaps there is something that I am overlooking. The array size will be no larger than 200 elements.
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View array in Visual Studio debugger? [duplicate]
Is it possible to view an array in the Visual Studio debugger? QuickWatch only shows the first element of the array.
5 Ans...
Converting JavaScript object with numeric keys into array
...DDLE
and almost as easy without jQuery as well, converting the keys to an array and then mapping back the values with Array.map
var arr = Object.keys(obj).map(function(k) { return obj[k] });
FIDDLE
That's assuming it's already parsed as a javascript object, and isn't actually JSON, which is a s...
TypeScript typed array usage
...tax here:
this._possessions = new Thing[100]();
This doesn't create an "array of things". To create an array of things, you can simply use the array literal expression:
this._possessions = [];
Of the array constructor if you want to set the length:
this._possessions = new Array(100);
I have...
“Cloning” row or column vectors
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Here's an elegant, Pythonic way to do it:
>>> array([[1,2,3],]*3)
array([[1, 2, 3],
[1, 2, 3],
[1, 2, 3]])
>>> array([[1,2,3],]*3).transpose()
array([[1, 1, 1],
[2, 2, 2],
[3, 3, 3]])
the problem with [16] seems to be that the tran...
clearing a char array c
...ting the first element to a null would clear the entire contents of a char array.
16 Answers
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