bitarray

问题 I would like to install bitarray in Windows running python 2.6. I have mingw32 installed, and I have C:\Python26\Lib\distutils\distutils.cfg set to: [build] compiler = mingw32 If I type, in a cmd.exe window: C:\Documents and Settings\john\My Documents\bitarray-0.3.5>python setup.py install I get: [normal python messages skipped] C:\MinGW\bin\gcc.exe -mno-cygwin -mdll -O -Wall -IC:\Python26\include -IC:\Python26\PC -c bitarray/_bitarray.c -o build\temp.win32-2.6\Release\bitarray\_bitarray.o

问题 Possible Duplicate Converting byte array to string and back again in C# I am using Huffman Coding for compression and decompression of some text from here The code in there builds a huffman tree to use it for encoding and decoding. Everything works fine when I use the code directly . For my situation, i need to get the compressed content, store it and decompress it when ever need. The output from the encoder and the input to the decoder are BitArray . When I tried convert this BitArray to

问题 What is the fastest way to determine whether a vector holding boolean values (which is typically optimized as a bit array) only holds true values? For small vectors, I think it might not be a bad idea to just compare the vector against another vector storing only true values (assuming we know the size of both vectors). 回答1: Given const vector<bool> foo(13) use find: cout << (find(foo.begin(), foo.end(), false) == foo.end()) << endl; Or if you have c++11 you can none_of: cout << none_of(cbegin

问题 I have a bit array. And I want to filter based on if certain bits are ON or OFF. Looking at the Elasticsearch 2.3 docs, I don't see anything about bitarrays. But it seems I can use an Array of Booleans or a Binary field. Example: Let's say I have 2 documents each with a bit array field. Doc1 has 011100 and Doc2 has 00001 in that field. And I want to filter by 011000 which in this case only gives Doc1. Any ideas how to do this in Elasticsearch? Thanks you. Edit: Another idea: If I turn the bit

问题 I have an int array of bits (length always 64) like: 1110000100000110111001000001110010011000110011111100001011100100 and I want to write it in one Int64 (or ulong?) variable. How to do it? I tried to create a BitArray and then get int , but it throws System.ArgumentException , on CopyTo line: private static Int64 GetIntFromBitArray(BitArray bitArray) { var array = new Int64[1]; bitArray.CopyTo(array, 0); return array[0]; } 回答1: That is because as mentioned in the documentation, The specified

问题 What is the best way to generate a set of bitarray-like objects so that I can test for membership efficiently. The naive way doesn't seem to work as I expect: >>> from bitarray import bitarray >>> >>> bitarray_set = set([bitarray('0000'), bitarray('0001')]) >>> bitarray_set set([bitarray('0001'), bitarray('0000')]) >>> >>> bitarray('0000') in bitarray_set False A workaround is to keep a separate set of strings or other more friendly object as keys. Then convert a bitarray to a string and test

问题 I need to track a set of perhaps 10 million numbers in Python. (All numbers are between 0 and 2^32). I'll know before hand the max val of an integer, and, between 0 and max, between 20-80% of the values will be in the set. My current code uses the built in set . This way too slow. As far as performance is considered, the best way to do this is with a bitarray (such as https://pypi.python.org/pypi/bitarray/ ). It's easy for me to use a bitarray to build a class with add(n) and remove(n)

问题 I need a class with functionality equal to vector<bool> in C++. The Rust documentation tells about BitVec, but use std::collections::BitVec causes Unresolved import error during compiling. According to a pull request, BitVec has been removed. Is there any adequate replacement for it? 回答1: There does not exist a dedicated bit-vector in the standard library and Vec<bool> is not specialized like C++'s vector<bool> . Rust advocates the use of external crates instead of building a huge standard

问题 I have var previous = new BitArray(new bool[]{true}); var current = new BitArray(new bool[]{false}); I want to concatenate them. I have already tried: var next = new BitArray(previous.Count + current.Count); var index = 0; for(;index < previous.Count; index++) next[index] = previous[index]; var j = 0; for(;index < next.Count; index++, j++) next[index] = current[j]; previous = current; But it doesn't look like the best way to do it. 回答1: Unfortunately it looks like your method might be as good

问题 Case : Again trying to capture packets through my NIC, I have developed 2 Extensions to use in capturing variable number of bits public static string ReadBits ( this BinaryReader Key , int Value ) { BitArray _BitArray = new BitArray ( Value ); for ( int Loop = 0 ; Loop > Value ; Loop++ ) { /* Problem HERE ---> */ _BitArray [ Loop ] = Key . ReadBoolean ( ); } return BitConverter . ToString ( _BitArray . ToByteArray ( ) ); } public static byte [ ] ToByteArray ( this BitArray Key ) { byte [ ]