tuples

问题 I spent a while the other day looking for a way to check if a row vector is contained in some set of row vectors in R. Basically, I want to generalize the %in% operator to match a tuple instead of each entry in a vector. For example, I want: row.vec = c("A", 3) row.vec # [1] "A" "3" data.set = rbind(c("A",1),c("B",3),c("C",2)) data.set # [,1] [,2] # [1,] "A" "1" # [2,] "B" "3" # [3,] "C" "2" row.vec %tuple.in% data.set # [1] FALSE for my made-up operator %tuple.in% because the row vector c("A

问题 Is there a clean/simple way to unpack a Python tuple on the right hand side from left to right? For example for j = 1,2,3,4,5,6,7 (1,2,3,4,5,6,7) v,b,n = j[4:7] Can I modify the slice notation so that v = j[6], b=j[5], n=j[4] ? I realise I can just order the left side to get the desired element but there might be instances where I would just want to unpack the tuple from left to right I think. 回答1: In case you want to keep the original indices (i.e. don't want to bother with changing 4 and 7

问题 This question already has answers here : Why does adding a trailing comma after a variable name make it a tuple? (6 answers) Closed 3 years ago . How python initializes a tuple object ? For example, when I create an object like >>> object = ('Shark') It shows type of object as str >>> type(object) <type 'str'> While, if I create an object like >>> object = ('Shark',) It displays its type as a tuple >>> type(object) <type 'tuple'> Why so ?? How exactly python creates/initializes a tuple, str

问题 I have a list of tuples that I'm trying to sort. The tuples contain strings: connectionsList = [('C', 'B'), ('A', 'C'), ('D', 'B'), ('C','D')] The strings in the tuples have numeric values stored in a dict: valuesDict = {'A':3, 'B':5, 'C':1, 'D':2} What I'd like to do is sort the list by the sum of the values in the dict for the tuples. Desired output for this toy example would be: [(C,D), (A,C), (C,B), (D,B)] which would have the sums of: [3, 4, 6, 7] Using itemgetter, I can sort

问题 I have following code: class TR_AgentInfo : public tuple< long long, //AgentId string, //AgentIp > { public: TR_AgentInfo() {} TR_AgentInfo( const long long& AgentId, const string& AgentIp, ) { get<0>(*this) = AgentId; get<1>(*this) = AgentIp; } long long getAgentId() const { return get<0>(*this); } void setAgentId(const long long& AgentId) { get<0>(*this) = AgentId; } string getAgentIp() const { return get<1>(*this); } void setAgentIp(const string& AgentIp) { get<1>(*this) = AgentIp; } };

问题 I have an array of strings: ["ABC", "GHI"] ad I want all the 'letter' combinations, as reads from left to right, i.e. ["AG", "AH", "AI", "BG", "BH", "BI", "CG", "CH", "CI"] but not "GA", "GB", "HA", etc. Similarly, ["ABC", "DEF", "GHI"] should generate ["ADG", "ADH", "ADI", "AEG", "AEH", "AEI", "AFG", "AFH", "AFI", "BDG", "BDH", "BDI", "BEG", "BEH", "BEI", "BFG", "BFH", "BFI", "CDG", "CDH", "CDI", "CEG", "CEH", "CEI", "CFG", "CFH" "CFI"] but not "DAG", "GAD" or "GFA" 回答1: This is what you

问题 in C++11 a lambda function is an object, and it should be possible to call make_tuple with it, right? void foobar() { auto t = std::make_tuple([](){ std::make_shared<int>(); }); } This code works for me. Now what happens if we add a variadic template: #include <tuple> #include <memory> template <class... T> void foobar() { auto t = std::make_tuple([](){ std::make_shared<T>(); }...); } int main(int, char**) { foobar<int, float, double>(); return 0; } This one fails to compile in GCC 4.7.2 main

问题 I have a function named _push which can handle different parameters, including tuples, and is supposed to return the number of pushed elements. For example, _push(5) should push '5' on the stack (the stack of lua) and return 1 (because one value was pushed), while _push(std::make_tuple(5, "hello")) should push '5' and 'hello' and return 2. I can't simply replace it by _push(5, "hello") because I sometimes use _push(foo()) and I want to allow foo() to return a tuple. Anyway I can't manage to

问题 I have a 2 D tuple (Actually I thought, it was a list.. but the error says its a tuple) But anyways.. The tuple is of form: (floatnumber_val, prod_id) now I have a dictionary which contains key-> prod_id and value prod_name now.. i want to change the prod_id in tuple to prod_name So this is waht I did #if prodName is the tuple # prodDict is the dictionary for i in range(len(prodName)): key = prodName[i][1] # get the prodid if prodDict.has_key(key): value = prodDict[key] prodName[i][1] = value

问题 I'm using Tuple2 in my Java code, and I was wondering if there was a difference between accessing the values via the getter or just getting the variables directly. Tuple2<String,String> tuple = new Tuple2<>("Hello", "World"); //getting values directly String direct = tuple._1; //using getter String indirect = tuple._1(); 回答1: The first loads a field where the second invokes the method using getField and invokeVirtual opcodes relatively. The generated byte-code looks like 13: getfield #6 //