lag

I am making a game and all is going well except for the game loop. I am using a SurfaceView and drawing 2D Sprites (Bitmaps). Currently the game is a ship moving through an asteroid field. The ship stays in the center of the screen and the phone is tilted in either direction to move the the asteroids (asteroids change location instead of player). New asteroids spawn as old ones fall off the screen creating an infinite asteroid field feeling. Running on my Nexus 5, I noticed that after about 3 seconds, the asteroids moving down the screen became choppy, despite my game loop set to run at 60fps.

I want to create lagged variable for a variable pm10 and used the following code. However, I could not get what I wanted. How could I create a lag of pm10? df2$l1pm10 <- lag(df2$pm10, -1, na.pad = TRUE) df2$l1pm102 <- lag(df2$pm10, 1) dput(df2) structure(list(var1 = 1:10, pm10 = c(26.956073733, NA, 32.838694951, 39.9560737332, NA, 40.9560737332, 33.956073733, 28.956073733, 32.348770798, NA), l1pm10 = structure(c(26.956073733, NA, 32.838694951, 39.9560737332, NA, 40.9560737332, 33.956073733, 28.956073733, 32.348770798, NA), .Tsp = c(2, 11, 1))), .Names = c("var1", "pm10", "l1pm10"), row.names =

I've made the following calculation involving LAG(): (lag(fValue,1,fValue) OVER (PARTITION BY Cluster ORDER BY iSequence) + fValue) / 2 as fValueAjusted It takes the previous (based on iSequence) record's fValue, sums with current one, and divides it by 2. But, instead of using fValue, I must do that using previous record's fValueAjusted. It means that first record's fValueAjusted will be its own fValue. Second record's fValueAjusted will be based on first record's fValue. And, starting from third record, it's calculation will be based on previous record's fValueAjusted. I need fValueAjusted

I am using a ListView containing images. These images are loaded from the Internet inside the adapter. Therefore I am using the UniversalImageDownloader . Unfortunately the scrolling of the ListView "lags" for a short time as soon as I scroll down where new content has to be downloaded. I acutally expected behaviour like the ListView scrolls perfectly smooth, but the loading of the Image can of course take some more time - which should not effect the smoothness of scrolling. Furthermore, as I scroll back up the lags occur as well. It seems as if the images are not cached properly. Maybe my

I'm playing WAVs on my Android phone by loading the file and feeding the bytes into AudioTrack.write() via the FileInputStream > BufferedInputStream > DataInputStream method. The audio plays fine and when it is, I can easily adjust sample rate, volume, etc on the fly with nice performance. However, it's taking about two full seconds for a track to start playing. I know AudioTrack has an inescapable delay, but this is ridiculous. Every time I play a track, I get this: 03-13 14:55:57.100: WARN/AudioTrack(3454): obtainBuffer timed out (is the CPU pegged?) 0x2e9348 user=00000960, server=00000000

I have an interesting SQL problem. I have a hierarchic table of parts that make a bill of material. similar to this: ASSEMBLY --------- parent_part_id part_id quantity I get the hierarchy of this structure with a query like this: SELECT level, part_id, quantity from assembly start with parent_part_id = 1 connect by parent_part_id = prior part_id; the output might look like this: level part_id quantity ----- ------- --------- 1 2 2 2 3 10 1 4 2 2 5 1 3 3 5 so far so good. the question is this: how do I calculate the total number of each part required in order to make the top level assembly