while-loop

问题 I am stuck on this problem. I am thinking that I may need a looping update (if that exists), but maybe there is a better way? I am working with claims drug prescription data, so essentially 5 columns User, Drug, RxStartDate, DaySupply, and 'RxEndDate' = dateadd(dd, DaySupply-1, RxStartDate) If the same user has 2 prescriptions that overlap (Rx1 EndDate >= Rx2 StartDate), then I need to sum the DaySupply together. Once I sum the DaySupply, the RxEndDate will extend and I need to check again if

问题 Total newbie trying to learn... thanks for all the help so far! UPDATE - updated code below - Thanks Phill I'm now trying to get the relevant horse information from a table horses which I can join to race_form with the horse_name field. I want to then display the information for each horse in the race below the while($racecard) info. Does this make it a bit clearer? I thought I could just do another query and then a while loop with mysql_fetch_array below the one I have already and that would

问题 This question already has answers here : Running a JFrame with a JProgressBar (2 answers) Closed 6 years ago . I am working on a Java program, which reads text files does some probability calculations. Reading files and all related calculations are done in a while loop. I had created a GUI using JFrame, where i had added a Progress bar (using JProgressBar) to show the progress since the program takes a while to process the files. The code looks like - while( there are more files to read ) {

问题 in a while loop its creating a list of heading and image links, i want to display it as side by side like in following image.Each heading shold comes as new column and image should come under each category.and only 3 rows. Here is my code: <table> <tr> <th>Heading 1</th> <th>Heading 2</th> <th>Heading 3</th> </tr> <?php //example array $images = array('Image 1', 'Image 2', 'Image 3', 'Image 4', 'Image 5', ); for ($i=0; $i<count($images); $i++) { ?> <tr> <td> <?php echo $images[$i]; ?></td>

问题 I have an error/warning associated with "while" loop, in Xcode. Any suggestions on how to fix it? while ( (c=getchar() != '\n') && c != EOF); While loop has empty body Picture in the IDE: 回答1: Without knowing which compiler is behind it, I can just list the know warning flags for 2 of them: clang -Wempty-body ; included in -Wextra too; Visual C++ C4390, included in /W3 (source: Why didn't the compiler warn me about an empty if-statement?) While this compiler warning is very useful for

问题 I'm analyzing large tables (300 000 - 500 000 rows) that store data output by a disease simulation model. In the model, animals on a landscape infect other animals. For example, in the example pictured below, animal a1 infects every animal on the landscape, and the infection moves from animal to animal, branching off into "chains" of infection. In my example below, I want to take the table that stores information about each animal (in my example below, table = allanimals ) and slice out just

问题 I would like to know if / how it is possible to parallelize a while loop in R. If it is not possible or reasonably considered too difficult to accomplish, I would greatly appreciate an alternative, possibly using a parallel for loop instead. 回答1: You can use futures with any looping R construct including for() and while() loops. Futures are implemented in the future package (I'm the author). It is not clear what condition you want to use for your while loop. That would have helped give a more

问题 I'm trying this simple code, but the damn break doesn't work... what is wrong? while True: for proxy in proxylist: try: h = urllib.urlopen(website, proxies = {'http': proxy}).readlines() print 'worked %s' % proxy break except: print 'error %s' % proxy print 'done' It's supposed to leave the while when the connection work, and go back and try another proxy if it didn't ok, here is what I'm doing I'm trying to check a website and if it changed, it has to break out of the while to continue to

问题 Trying to find unique ID in Node.js and MongoDB, by creating a while loop that queries MongoDB for existing IDs, until a unique value is found. If the ID is already in use, a number is incremented on the end until Mongo returns nothing. Everything is working, except for the break; statement when a unique ID is found. Node.js returns: SyntaxError: Illegal break statement The code: db.collection('landmarks').findOne({'id':uniqueIDer}, function(err, data){ //if ID exists already if (data.id){

问题 I notice that NetBeans is warning me about using Thread.sleep() in a while loop in my Java code, so I've done some research on the subject. It seems primarily the issue is one of performance, where your while condition may become true while the counter is still sleeping, thus wasting wall-clock time as you wait for the next iteration. This all makes perfect sense. My application has a need to contact a remote system and periodically poll for the state of an operation, waiting until the