tuples

问题 I timed two ways to create a tuple of length N. This is very fast: def createTuple(): for _ in range(100000): tuplex = (0,) * 1000 CPU times: user 439 ms, sys: 1.01 ms, total: 440 ms Wall time: 442 ms This is very fast, but doesn't compile with Numba: Invalid use of Function(<built-in function mul>) with argument(s) of type(s): (UniTuple(Literal[int](0) x 1), int64) This is much slower: def createTuple(): for _ in range(100000): tuplex = tuple(0 for _ in range(1000)) %time createTuple() CPU

问题 I timed two ways to create a tuple of length N. This is very fast: def createTuple(): for _ in range(100000): tuplex = (0,) * 1000 CPU times: user 439 ms, sys: 1.01 ms, total: 440 ms Wall time: 442 ms This is very fast, but doesn't compile with Numba: Invalid use of Function(<built-in function mul>) with argument(s) of type(s): (UniTuple(Literal[int](0) x 1), int64) This is much slower: def createTuple(): for _ in range(100000): tuplex = tuple(0 for _ in range(1000)) %time createTuple() CPU

问题 How can I average, in a generic sense, the values in a tuple of tuples such that: (1,2,3),(3,4,5) becomes: (2,3,4) 回答1: You can use zip like so: In [1]: x = ((1, 2, 3), (4, 5, 6)) In [2]: [sum(y) / len(y) for y in zip(*x)] Out[3]: [2, 3, 4] Another method using lambda with more then 2 tuples in the tuple and resulting in float's instead of int's: >>> x = ((10, 10, 10), (40, 55, 66), (71, 82, 39), (1, 2, 3)) >>> print tuple(map(lambda y: sum(y) / float(len(y)), zip(*x))) (30.5, 37.25, 29.5)

问题 How can I average, in a generic sense, the values in a tuple of tuples such that: (1,2,3),(3,4,5) becomes: (2,3,4) 回答1: You can use zip like so: In [1]: x = ((1, 2, 3), (4, 5, 6)) In [2]: [sum(y) / len(y) for y in zip(*x)] Out[3]: [2, 3, 4] Another method using lambda with more then 2 tuples in the tuple and resulting in float's instead of int's: >>> x = ((10, 10, 10), (40, 55, 66), (71, 82, 39), (1, 2, 3)) >>> print tuple(map(lambda y: sum(y) / float(len(y)), zip(*x))) (30.5, 37.25, 29.5)

问题 - Construction i constructed a vector of tuples vector<tuple<int,int,int>> x . For sake of simplicity, lets assume it is constructed it this way. vector<tuple<int,int,int>> x; for (int ii=0; ii < 10; ii++){ for (int jj=0; jj < 10; jj++){ currpeak[0] = ii + rand() % 10; currpeak[1] = jj + rand() % 10; currpeak[2] = rand() % 100; x.emplace_back(currpeak[0], currpeak[1], currpeak[2]); } } Now i want to get the n largest tuples, according to the 3rd element, and append them to another variable

问题 - Construction i constructed a vector of tuples vector<tuple<int,int,int>> x . For sake of simplicity, lets assume it is constructed it this way. vector<tuple<int,int,int>> x; for (int ii=0; ii < 10; ii++){ for (int jj=0; jj < 10; jj++){ currpeak[0] = ii + rand() % 10; currpeak[1] = jj + rand() % 10; currpeak[2] = rand() % 100; x.emplace_back(currpeak[0], currpeak[1], currpeak[2]); } } Now i want to get the n largest tuples, according to the 3rd element, and append them to another variable

问题 Is it possible to write a C# method that accepts a value tuple with any number of items of the same type and converts them into a list? Edit 2/6/2019 I accepted the Provided answer as the correct one. I wanted to also provide a solution that uses a base class that is not an interface, becuase I am trying to write a conversion operator and user defined conversions from an interface are not allowed. public static class TupleExtensions { public static IEnumerable<object> Enumerate(this ValueType

问题 Consider this chunk of code where I'm testing an unknown variable that could be an int, MyObj, or Tuple, and I'm doing some type checking to see what it is so that I can go on and handle the data differently depending on what it is: class MyObj { } // ... void MyMethod(object data) { if (data is int) Console.Write("Datatype = int"); else if (data is MyObj) Console.Write("Datatype = MyObj"); else if (data is Tuple<object,object>) { var myTuple = data as Tuple<object,object>; if (myTuple.Item1

问题 Consider this chunk of code where I'm testing an unknown variable that could be an int, MyObj, or Tuple, and I'm doing some type checking to see what it is so that I can go on and handle the data differently depending on what it is: class MyObj { } // ... void MyMethod(object data) { if (data is int) Console.Write("Datatype = int"); else if (data is MyObj) Console.Write("Datatype = MyObj"); else if (data is Tuple<object,object>) { var myTuple = data as Tuple<object,object>; if (myTuple.Item1

问题 I would like to save the dictionary having tuple on keys. I tried pickle, ujson, json to save the dictionary. All of them did not work. The dictionary has: dictionary = {(-30, -29, -72, -71): [[-29.99867621124457, -71.75349423197208, 220], [-29.996964568219873, -71.7521560207641, 220], [-29.99696437241995, -71.7507330056961, 220], [-29.99761665426199, -71.75016101067708, 220]]} I tried: with open('depth_echo.txt', 'w') as file: file.write(ujson.dumps(dictionary) import json a, b, c = "abc"