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How to convert Strings to and from UTF8 byte arrays in Java
In Java, I have a String and I want to encode it as a byte array (in UTF8, or some other encoding). Alternately, I have a byte array (in some known encoding) and I want to convert it into a Java String. How do I do these conversions?
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What does the “at” (@) symbol do in Python?
...mple, we would use this syntax to calculate the inner and outer product of arrays and matrices:
>>> from numpy import array, matrix
>>> array([[1,2,3]]).T @ array([[1,2,3]])
array([[1, 2, 3],
[2, 4, 6],
[3, 6, 9]])
>>> array([[1,2,3]]) @ array([[1,2,3]]).T
a...
Storing R.drawable IDs in XML array
...ke to store drawable resources' ID in the form of R.drawable.* inside an array using an XML values file, and then retrieve the array in my activity.
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Getting a slice of keys from a map
...ests (using a map with 1,000,000 random int64 keys and then generating the array of keys ten times with each method), it was about 20% faster to assign members of the array directly than to use append.
Although setting the capacity eliminates reallocations, append still has to do extra work to chec...
How can I shuffle an array? [duplicate]
I want to shuffle an array of elements in JavaScript like these:
2 Answers
2
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Reading a string with scanf
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An array "decays" into a pointer to its first element, so scanf("%s", string) is equivalent to scanf("%s", &string[0]). On the other hand, scanf("%s", &string) passes a pointer-to-char[256], but it points to the same pla...
Mongoose (mongodb) batch insert?
... seconds.
Model.collection.insert(docs, options, callback)
docs is the array of documents to be inserted;
options is an optional configuration object - see the docs
callback(err, docs) will be called after all documents get saved or an error occurs. On success, docs is the array of persisted doc...
Javascript - sort array based on another array
Is it possible to sort and rearrange an array that looks like this:
21 Answers
21
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how to stop Javascript forEach? [duplicate]
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Breaking out of Array#forEach is not possible. (You can inspect the source code that implements it in Firefox on the linked page, to confirm this.)
Instead you should use a normal for loop:
function recurs(comment) {
for (var i = 0; i ...
How to calculate a logistic sigmoid function in Python?
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Using math.exp with numpy array can yield some errors, like: TypeError: only length-1 arrays can be converted to Python scalars. To avoid it you should use numpy.exp.
– ViniciusArruda
Nov 23 '17 at 13:41
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