comparison

问题 I have a general question on your opinion about my "technique". There are 2 textfiles ( file_1 and file_2 ) that need to be compared to each other. Both are very huge (3-4 gigabytes, from 30,000,000 to 45,000,000 lines each). My idea is to read several lines (as many as possible) of file_1 to the memory, then compare those to all lines of file_2 . If there's a match, the lines from both files that match shall be written to a new file. Then go on with the next 1000 lines of file_1 and also

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 5 years ago . I am trying to get myself acquainted with the world of rich web application. There are some comparison tables of available technologies on the Wikipedia, but I still find it unclear what are the options for rich application development. Could you please verify and complete the

问题 I would like to create a program that compares two images. I need to take images from two different folders and compare that images if they are same or not. Then I want to print out as same or different. For example file 1 will have image1 and image 2 and image 3 , etc then file 2 will have image1,image2 and image3 etc . I need to do this python. How do I do this? Can someone help me? I am new to programming and I am new to python as well. I have tried the solution as below, but it did not

问题 I have a list of addresses in column A of both sheets. sheet1 and sheet2 I'm just wondering is there an efficient way to compare data in two sheets and do the following; Remove addresses from sheet1 that are not in sheet2. Add the addresses from sheet2 that are not in sheet1 to the end of sheet1. My initial intention was to loop but this is apparently not efficient memory wise due to the being roughly 10000 addresses on each sheet. 回答1: Yes there is - Microsoft Query (SQL in Excel). You can

问题 I have a rather ugly query, and the results from the query are then post-processed using php which turns each row into it's own multidimensional array. I want to refactor the query but need to make sure I do not change what it returns in any way. So What I want to do is copy the original query and call that, store the results. then run the function again with my new query. Loop over the two arrays of results and compare them for any differences what so ever (keys, values, missing entries,

问题 I'm trying to compare date values in entity framework. DateTime selectedDate = Calendar1.SelectedDate; var result = context.EventsTable.Where(ev =>ev.EventDate.Equals(selectedDate)); ev.EventDate is coming from SQL Server 2008 and selectedDate is ASP:Calendar's Selected date. In SQL Server 2008 date is stored as: 2012-09-03 00:00:00 whereas date value from Calendar's SelectedDate is in 2012-09-03 12:00:00AM format. 回答1: You should probably truncate EventDate : context.EventsTable .Where(ev =>

问题 In PHP I had to compare if an integer variable was less than a value of an array, but I had an error in the code and I found by chance an unexpected behavior. I was comparing the integer with the array itself and it was returning true. Do you know why? I've been searching about this in StackOverflow and php.net (PHP types comparisons) and I didn't found a specific answer. Here you have a little code to test this. <?php $myArray = array(); $myInt = 1; if($myInt < $myArray){ echo "Int less than

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 6 years ago . I wrote a little C# command application. Four arrays are supposed to be sorted with a heapsort algorithm. I took an algorithm from a website and its running just fine. Now I want to count the key-comparisons the algorithm needs to sort one array. I tried to count the comparisons via for loop but its seems to be

问题 I have a problem baffling me terribly. I noticed this before but didn't give it any heed until today. I was trying to write my own check for integer strings. I know of is_numeric() but it does not suffice since it counts float as numeric not only integers and is_int() which does not work on string numbers. I did something similar to this $var1 = 'string'; $var2 = '123'; var_dump( (int)$var1 == $var1);// boolean true var_dump((int)$var2 == $var2);// boolean true var_dump((int)$var1);//int 0

问题 In python the following statement returns correct results: >>> 1 == 1 == 1 True >>> 1 == 1 == 0 False Is such construct (or similar) possible in groovy? The following fails: groovy:000> 1 == 1 == 1 ===> false since the first comparison is evaluated to true and true is not equal to 1 . Any workaround on this? 回答1: A workaround would be using AST transformations of course: http://docs.groovy-lang.org/docs/next/html/documentation/core-metaprogramming.html#developing-ast-xforms 回答2: Or if not the