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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...
Getting JavaScript object key list
...e, as it means you're implicitly typing the object. Assigning [] to it (or array() back then) makes it an array, which you can then use as an array safely.
– Niels Keurentjes
Nov 29 '14 at 23:28
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Remove json element
...n.foo from the dictionary.
You can use splice to remove elements from an array.
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Listing all permutations of a string/integer
... Main()
{
string str = "sagiv";
char[] arr = str.ToCharArray();
GetPer(arr);
}
}
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How to get indices of a sorted array in Python
...n available:
>>> import numpy
>>> numpy.argsort(myList)
array([0, 1, 2, 4, 3])
http://docs.scipy.org/doc/numpy/reference/generated/numpy.argsort.html
This returns the arguments that would sort the array or list.
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Finding the index of elements based on a condition using python list comprehension
...I similar to Matlab's, you would use numpy, a package for multidimensional arrays and numerical math in Python which is heavily inspired by Matlab. You would be using a numpy array instead of a list.
>>> import numpy
>>> a = numpy.array([1, 2, 3, 1, 2, 3])
>>> a
array([1,...
Null check in an enhanced for loop
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Use ArrayUtils.nullToEmpty from the commons-lang library for Arrays
for( Object o : ArrayUtils.nullToEmpty(list) ) {
// do whatever
}
This functionality exists in the commons-lang library, which is included in most Java pr...
How do I split a string with multiple separators in javascript?
...dited to add:
You can get the last element by selecting the length of the array minus 1:
>>> bits = "Hello awesome, world!".split(/[\s,]+/)
["Hello", "awesome", "world!"]
>>> bit = bits[bits.length - 1]
"world!"
... and if the pattern doesn't match:
>>> bits = "Hello ...
python numpy ValueError: operands could not be broadcast together with shapes
In numpy, I have two "arrays", X is (m,n) and y is a vector (n,1)
6 Answers
6
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How do you use the ellipsis slicing syntax in Python?
...nsion, you can use the ellipsis notation
>>> a[..., 0].flatten()
array([ 0, 2, 4, 6, 8, 10, 12, 14])
which is equivalent to
>>> a[:,:,:,0].flatten()
array([ 0, 2, 4, 6, 8, 10, 12, 14])
In your own implementations, you're free to ignore the contract mentioned above and...