lag

I have a very large dataset that looks simplified like this: row. member_id entry_id comment_count timestamp 1 1 a 4 2008-06-09 12:41:00 2 1 b 1 2008-07-14 18:41:00 3 1 c 3 2008-07-17 15:40:00 4 2 d 12 2008-06-09 12:41:00 5 2 e 50 2008-09-18 10:22:00 6 3 f 0 2008-10-03 13:36:00 I can aggregate the counts with the following code: transform(df, aggregated_count = ave(comment_count, member_id, FUN = cumsum)) But I want a lag of 1 in the cumulated data, or I want cumsum to ignore the current row. The result should be: row. member_id entry_id comment_count timestamp previous_comments 1 1 a 4 2008

See demo: jsFiddle I have a simple form that is being toggled when clicking 'show' / 'cancel' Everything works fine, but if you click 'cancel' shortly after the form is revealed, there's a good 2-3 seconds lag before the animation even begins . This doesn't happen if you wait a few seconds before clicking 'cancel'. The lag occures in all tested browsers (ie, ff, chrome). 1. What could cause this lag and how can it be prevented? 2. Is there a better way of coding this sequence of animations, that might prevent any lags? HTML : <div id="newResFormWrap"> <form id="newResForm" action="" method=

Playing a very short sound (~0.5s) produces a hiccup (like a lag) in my SpriteKit iOS game programmed in Swift. In other questions, I read that I should prepareToPlay() the sound, which I did. I even used a variable ( soundReady ) to check if the sound is prepared before playing it. I also re-prepare the sound whenever it is finished playing ( audioPlayerDidFinishPlaying() ). Here are the relevant parts of the code: class GameScene: SKScene, AVAudioPlayerDelegate { var splashSound = NSURL() var audioPlayer = AVAudioPlayer() var soundReady = false override func didMoveToView(view: SKView) { let

I have been working ot see the equivalent function for Oracle lead and lag function. The oracle lead would look like LEAD(col1.date,1,ADD_MONTHS(col1.DATE,12)) OVER(Partition By tab.a,tab.b,tab.c Order By tab.a)-1 END_DATE LAG(col1.DATE + 7,1,col1.DATE-1) OVER(partition by tab.a,tab.b Order By tab.b) LAG_DATE Any better idea I believe you can take the following SQL as a basis and modify it to meet your needs: SELECT CALENDAR_DATE , MAX(CALENDAR_DATE) OVER(PARTITION BY 1 ORDER BY CALENDAR_DATE ROWS BETWEEN 1 PRECEDING AND 1 PRECEDING) AS Lag_ --Yesterday , MIN(CALENDAR_DATE) OVER(PARTITION BY 1

Following some other questions on Stack Overflow, I've read the guide to the internals of Android Surfaces, SurfaceViews, etc from here: https://source.android.com/devices/graphics/architecture.html That guide has given me a much improved understanding of how all the different pieces fit together on Android. It covers how eglSwapBuffers just pushes the rendered frame into a queue which will later be consumed by SurfaceFlinger when it prepares the next frame for display. If the queue is full, then it will wait until a buffer becomes available for the next frame before returning. The document