comparison

问题 Is there any way to programatically compare two sound files to determine if they are identical, or nearly identical? These are not mp3 files and do not have any ID3 or other meta data, but plain wav files. Comparing the checksum values may not work as they may not be completely identical. 回答1: The wikipedia article on acoustic fingerprinting mentions a number of products, including the opensource libfooid. Basically you're looking at going into the frequency domain, taking rough levels over a

问题 I'm comparing a date with current date(i.e. today's date). It is expected that the error should come only when the date to be compared is greater than today's date. It should not come for date which is less than or equal to today's date. I've written following code for it. $submission_date = $_POST['submission_date']; //The date in mm-dd-yyyy format that is to be tested against today's date. The value in $submission date is 12-25-2014 //This is a future date. Today's date is 12-10-2014 in dd

问题 I am stuck between these two NoSQL databases. In my project I will be creating a database within a database. For example, I need a solution to create dynamic tables. So users can create tables with columns and rows. I think either MongoDB or CouchDB will be good for this, but I am not sure which one. I will also need efficient paging as well. 回答1: Of C, A & P (Consistency, Availability & Partition tolerance) which 2 are more important to you? Quick reference, the Visual Guide To NoSQL Systems

问题 Using GroupBy() and Count() > 1 I'm trying to find duplicate instances of my class in a list. The class looks like this: public class SampleObject { public string Id; public IEnumerable<string> Events; } And this is how I instantiate and group the list: public class Program { private static void Main(string[] args) { var items = new List<SampleObject>() { new SampleObject() { Id = "Id", Events = new List<string>() { "ExampleEvent" } }, new SampleObject() { Id = "Id", Events = new List<string>

问题 I have a matrix with 41 rows and 6 columns. This is how the first part looks like. X13 X15 X17 X19 X21 X23 [1,] "7" "6" "5" "8" "1" "8" [2,] "7" "6" "5" "8" "14" "3" [3,] "7" "6" "1" "3" "12" "3" [4,] "7" "6" "1" "5" "6" "14" [5,] "2" "6" "1" "5" "16" "3" [6,] "2" "3" "5" "5" "2" "3" [7,] "7" "5" "5" "17" "7" "3" [8,] "7" "2" "5" "2" "2" "14" [9,] "2" "2" "10" "10" "2" "3" [10,] "2" "2" "10" "5" "2" "6" My goal is, to compare all the columns with each other, and see, how many of the numbers

问题 max(float('nan'), 1) evaluates to nan max(1, float('nan')) evaluates to 1 Is it the intended behavior? Thanks for the answers. max raises an exception when the iterable is empty. Why wouldn't Python's max raise an exception when nan is present? Or at least do something useful, like return nan or ignore nan . The current behavior is very unsafe and seems completely unreasonable. I found an even more surprising consequence of this behavior, so I just posted a related question. 回答1: In [19]: 1

问题 This question already has answers here : Bash If-statement to check If string is equal to one of several string literals (2 answers) Closed last month . i have the following piece of bashscript: function get_cms { echo "input cms name" read cms cms=${cms,,} if [ "$cms" != "wordpress" && "$cms" != "meganto" && "$cms" != "typo3" ]; then get_cms fi } But no matter what i input (correct and incorrect values) it never calls the function again, because I only want to allow 1 of those 3 inputs. I

问题 I am looking for a JavaScript function that can compare two strings and return the likeliness that they are alike. I have looked at soundex but that's not really great for multi-word strings or non-names. I am looking for a function like: function compare(strA,strB){ } compare("Apples","apple") = Some X Percentage. The function would work with all types of strings, including numbers, multi-word values, and names. Perhaps there's a simple algorithm I could use? Ultimately none of these served

问题 This question already has answers here : sizeof() operator in if-statement (5 answers) Closed last year . #include <stdio.h> int arr[] = {1,2,3,4,5,6,7,8}; #define SIZE (sizeof(arr)/sizeof(int)) int main() { printf("SIZE = %d\n", SIZE); if ((-1) < SIZE) printf("less"); else printf("more"); } The output after compiling with gcc is "more" . Why the if condition fails even when -1 < 8 ? 回答1: The problem is in your comparison: if ((-1) < SIZE) sizeof typically returns an unsigned long , so SIZE

问题 I want to demonstrate with a few line of code that in Java, that to compare two strings ( String ), you have to use equals() instead of the operator == . Here is something I tried : public static void main(String Args[]) { String s1 = "Hello"; String s2 = "Hello"; if (s1 == s2) System.out.println("same strings"); else System.out.println("different strings"); } I was expecting this output : different strings , because with the test s1 == s2 I'm actually comparing two references (i.e. addresses