Is there a way to easily handle functions returning std::pairs?
With structured binding from C++17, you may directly do auto [lhsMinIt, lhsMaxIt] = std::minmax_element(lhs.begin(), lhs.end());
tuples
How is tuple implemented in CPython?
Because in the course of normal operations Python will create and destroy a lot of small tuples, Python keeps an internal cache of small tuples for that purpose. This helps cut down on a lot of memory allocation and deallocation churn. For the same reasons small integers from -5 to 255 are interned (made into … Read more
Julia: Flattening array of array/tuples
Iterators.flatten(x) creates a generator that iterates over each element of x. It can handle some of the cases you describe, eg julia> collect(Iterators.flatten([(1,2,3),[4,5],6])) 6-element Array{Any,1}: 1 2 3 4 5 6 If you have arrays of arrays of arrays and tuples, you should probably reconsider your data structure because it doesn’t sound type stable. However, … Read more
Find tuple structure containing an unknown value inside a list
You can use the any() function: if any(t[0] == 1 for t in yourlist): This efficiently tests and exits early if 1 is found in the first position of a tuple.
Element-wise tuple addition
You could also consider using std::valarray since it allows exactly the things that you seem to want. #include <valarray> int main() { std::valarray<int> a{ 1, 2 }, b{ 2, 4 }, c; c = a – b; // c is {-1,-2} a += b; // a is {3,6} a -= b; // a is {1,2} … Read more
Converting a C char array to a String
The C array char name[8] is imported to Swift as a tuple: (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8) The address of name is the same as the address of name[0], and Swift preserves the memory layout of structures imported from C, as confirmed by Apple engineer Joe Groff: … You can leave the … Read more
How to convert tuple of tuples to pandas.DataFrame in Python?
import pandas as pd s = ((1,0,0,0,),(2,3,0,0,),(4,5,6,0,),(7,8,9,10,)) print pd.DataFrame(list(s)) # 0 1 2 3 # 0 1 0 0 0 # 1 2 3 0 0 # 2 4 5 6 0 # 3 7 8 9 10 print pd.DataFrame(list(s), columns=[1,2,3,4], index=[1,2,3,4]) # 1 2 3 4 # 1 1 0 0 0 # 2 … Read more
Passing a tuple as command line argument
Set nargs of the data argument to nargs=”+” (meaning one or more) and type to int, you can then set the arguments like this on the command line: –data 1 2 3 4 args.data will now be a list of [1, 2, 3, 4]. If you must have a tuple, you can do: my_tuple = … Read more
Two integers in Python have same id, but not lists or tuples
Immutable objects don’t have the same id, and as a matter of fact this is not true for any type of objects that you define separately. Generally speaking, every time you define an object in Python, you’ll create a new object with a new identity. However, for the sake of optimization (mostly) there are some … Read more
How to define operator< on an n-tuple that satisfies a strict weak ordering [duplicate]
strict weak ordering This is a mathematical term to define a relationship between two objects. Its definition is: Two objects x and y are equivalent if both f(x, y) and f(y, x) are false. Note that an object is always (by the irreflexivity invariant) equivalent to itself. In terms of C++ this means if you … Read more