indexing

问题 I have the following object in Couchbase: { "postReplyId": "Reply_9AE1F47E585522FD1D2EFFEA7671C0855BBFDA991698B23886E37D1C65DAC8AF_1375468399745", "userId": "User_9AE1F47E585522FD1D2EFFEA7671C0855BBFDA991698B23886E37D1C65DAC8AF", "postId": "Message_9AE1F47E585522FD1D2EFFEA7671C0855BBFDA991698B23886E37D1C65DAC8AF_1375457606125", "post_reply_message": "Testing", "attachments": { "images": [ ], "audio": [ ], "videos": [ ] }, "upVoters": [ ], "downVoters": [ ], "upVotes": 0, "report": 0,

问题 I have a table in HTML. The rows are counted (via use of $index ), and only certain rows are shown (via use of ng-show ). Problem : $index does not return the right count. The table's count should go like "1,2,3...", but it does not. <tbody> <tr ng-repeat="fruit in basket" ng-show="fruit.isJuicy == type"> <td>{{$index + 1}}</td> <td>{{fruit.Name}}</td> </tr> </tbody> Here's the JSFiddle ; don't forget to click on the buttons to see the issue: http://jsfiddle.net/f6HCX/2/ What is causing this

问题 I'm working with a large data frame and I'm struggling to find an efficient way to eliminate specific dates. Note that I'm trying to eliminate any measurements from a specific date . Pandas has this great function, where you can call: df.ix['2016-04-22'] and pull all rows from that day. But what if I want to eliminate all rows from '2016-04-22'? I want a function like this: df.ix[~'2016-04-22'] (but that doesn't work) Also, what if I want to eliminate a list of dates? Right now, I have the

问题 Trying to write a code that finds the location (index) of one number inside another. For example, num1=1948 , num2=94 the index will be 2. Can some one please tell me what i did wrong? thank you! int num1, num2, index=0; printf("Please enter a number: \n\n"); scanf_s("%d", &num1); printf("\n\nPlease enter another number: \n\n"); scanf_s("%d", &num2); int temp1 = num1; int temp2 = num2; while (temp1 != 0 || temp2 != 0) if (temp1 % 10 == temp2 % 10) { temp1 = temp1 / 10; temp2 = temp2 / 10;

问题 Let's say I have a query of the form: SELECT a, b, c, d FROM table1 WHERE a IN ( SELECT x FROM table2 WHERE some_condition); Now the query for the IN can return a huge number of records. Assuming that a is the primary key, so an index is used is this the best way to write such a query? Or it is more optimal to loop over each of the records returned by the subquery? For me it is clear that when I do a where a = X it is clear that I just do an index (tree) traversal. But I am not sure how an IN

问题 I want to open a file, and simply return the contents of said file with each line beginning with the line number. So hypothetically if the contents of a is a b c I would like the result to be 1: a 2: b 3: c Im kind of stuck, tried enumerating but it doesn't give me the desired format. Is for Uni, but only a practice test. A couple bits of trial code to prove I have no idea what I'm doing / where to start def print_numbered_lines(filename): """returns the infile data with a line number infront

问题 I am using the following index match formula: =IFERROR(INDEX(Data!V:V,MATCH(Home!F16,Data!C:C,0)),INDEX(Contacts!E:E,Home!H16 & "*",Contacts!B:B,0)) I am trying to lookup a vlaue on sheet Data, and if the value is not found then look up the value on sheet contacts. This always seems to be returning 0. Please can someone show me where i am going wrong? 回答1: You are missing the MATCH on the second INDEX: =IFERROR(INDEX(Data!V:V,MATCH(Home!F16,Data!C:C,0)),INDEX(Contacts!E:E,MATCH(Home!H16 & "*"

问题 in order to get the necessary height of a cell, I implemented a function like +(CGFloat)rowHeightForTableView:(UITableView*)tableView andObject:(NSObject*)theObject {...} within the cells. Since the tableView is one of the parameters, I can check whether it's a plain or grouped style table and include the resulting width in my calculations. But how should I check if an index is being shown? 回答1: You can check if the table view's datasource responds to the sectionIndexTitlesForTableView:

问题 This question seems basic but I have not been able to find an answer to it. I want to add columns of a data.frame together by just referring to their indeces. Suppose I want to add columns 1,2, and 4. df <- data.frame( a=rep(1, 5), b=rep(2, 5), c=rep(3, 5), d=rep(4, 5) ) I know that explicitly referring to the column names I can do > df$a + df$b + df$d [1] 7 7 7 7 7 And referring to indeces I can do > df[1] + df[2] + df[4] a 1 7 2 7 3 7 4 7 5 7 However, the index option above requires me to

问题 I'm looking for a way to search in Word documents and show a result of documents that matched the search criteria. I'll try to describe the scenario in more detail here. On a Windows system i have a bunch of folders. Each folder has alot of Word documents. Now i need an application that can search inside a specific folder for keywords that might occure in those word documents. Something like the FULLTEXT search that MySQL has. So if i search for the following keywords: microsoft, windows XP