hash

问题 I am new to Ruby, and I am trying to code a "simple" system, so I can keep track of stock transaction. Calculating the average price, and in the future I will try to get dividends information. So far, my code looks like this (PLEASE feel free to propose better ways to do my code, as I said, I am new). require 'money' require 'money/bank/google_currency' require 'monetize' require 'date' require 'ystock' require 'ostruct' # (optional) # set the seconds after than the current rates are

问题 I have two files (two columns each, split by tab) and I want to compare them based on the first column. If the value on the first column is the same on both files, I want to create a new file using second column values. Also, take into account that IDs in the first column of FILE1 can be duplicated. Basically I have: FILE1: TRINITY_DN10001_c0_g1_i1 TRINITY_DN10001_c0_g1_TRINITY_DN10001_c0_g1_i1_g.84091_m.84091 TRINITY_DN100032_c0_g2_i1 TRINITY_DN100032_c0_g2_TRINITY_DN100032_c0_g2_i1_g.20078

问题 I have a set of categories and their values stored as a list of hashes: r = [{:A => :X}, {:A => :Y}, {:B => :X}, {:A => :X}, {:A => :Z}, {:A => :X}, {:A => :X}, {:B => :Z}, {:C => :X}, {:C => :Y}, {:B => :X}, {:C => :Y}, {:C => :Y}] I'd like to get a count of each value coupled with its category as a hash like this: {:A => {:X => 4, :Y => 1, :Z => 1}, :B => {:X => 2, :Z => 1}, :C => {:X => 1, :Y => 3}} How can I do this efficiently? Here's what I have so far (it returns inconsistent values):

问题 I have a set of categories and their values stored as a list of hashes: r = [{:A => :X}, {:A => :Y}, {:B => :X}, {:A => :X}, {:A => :Z}, {:A => :X}, {:A => :X}, {:B => :Z}, {:C => :X}, {:C => :Y}, {:B => :X}, {:C => :Y}, {:C => :Y}] I'd like to get a count of each value coupled with its category as a hash like this: {:A => {:X => 4, :Y => 1, :Z => 1}, :B => {:X => 2, :Z => 1}, :C => {:X => 1, :Y => 3}} How can I do this efficiently? Here's what I have so far (it returns inconsistent values):

问题 Is there a way to use Hash (bcrypt) Passwords in ASP like in PHP... the following would be the code for PHP but what is the alternative for ASP .. is it the same and just change things around? does ASP support Hash(bcrypt) or is there other way to do ? please engliten me with this situation... PHP would be $link = mysql_connect('localhost', 'wpscanner', 'aUvmxcxvTUPtW8Kw') or die('Not connected : ' . mysql_error()); mysql_select_db('wpscanner', $link) or die ('Not selected : ' . mysql_error()

问题 I'm brand new to Go and having some trouble with nested data structures. Below is a array of hashes I mocked up that I need to make in Golang. I'm just confused with the whole having to declare the variable type beforehand and whatnot. Any ideas? var Array = [ {name: 'Tom', dates: [20170522, 20170622], images: {profile: 'assets/tom-profile', full: 'assets/tom-full'}}, {name: 'Pat', dates: [20170515, 20170520], images: {profile: 'assets/pat-profile', full: 'assets/pat-full'}} ..., ... ] 回答1:

问题 How do I populate a hash (that has been defined in a separate file) in my Perl script and do necessary operations on it? For ex: file1.pl -- contains the defined hash, file2.pl -- user defined code that should populate the hash from file1.pl my %tgs = ( 'articles' => { 'vim' => '20 awesome articles posted', 'awk' => '9 awesome articles posted', 'sed' => '10 awesome articles posted' }, 'ebooks' => { 'linux 101' => 'Practical Examples to Build a Strong Foundation in Linux', 'nagios core' =>

问题 I've looked at the wikipedia article on Hash tables but it doesn't seem to say anything about how to implement a hash table that can distribute entries of arbitrary SQL datatype evenly into n buckets. Can anyone point me in the direction of documentation or existing source code on this topic? 回答1: I believe you are talking about a perfect hash function. Oracle's ORA_HASH function is not a perfect hash function. http://en.wikipedia.org/wiki/Perfect_hash_function As close as you will get to

问题 Default function is from std::hash. I wonder if there are better hash functions for saving computational time? for integer keys as well as string keys. I tried City Hash from Google for both integer and string keys, but its performance is a little worse than std::hash. 回答1: std::hash functions are already good in performance. I think you should try open source hash functions. Check this out https://github.com/Cyan4973/xxHash. I quote from its description: "xxHash is an Extremely fast Hash

问题 I'm doing the Ruby 20 minute tutorial on ruby-lang.org and I came across this code messing with the irb: irb(main):015:0> def h(name) irb(main):016:1> puts "Hello #{name}!" irb(main):017:1> end based on the explanation, the #{name} part is just adding the variable to the string? I thought this was an odd and verbose way of writing it so I just thought I'd try "Hello" + name and it worked exactly the same way.. I googled around trying to find a meaning to #{} and I cant find anything talking