lag

问题 I have a very simple app that render a square with opengl, input touch are read by the GLSurfaceView and last position is exchanged with the rendering thread using a volatile variable. What I observe (and as been also very well described in https://www.mail-archive.com/android-developers@googlegroups.com/msg235325.html) is that there is a delay (a lag) between the touch position and the display. When activating the developer option to show touch position, I see that when moving rapidly: the

问题 I have a very simple app that render a square with opengl, input touch are read by the GLSurfaceView and last position is exchanged with the rendering thread using a volatile variable. What I observe (and as been also very well described in https://www.mail-archive.com/android-developers@googlegroups.com/msg235325.html) is that there is a delay (a lag) between the touch position and the display. When activating the developer option to show touch position, I see that when moving rapidly: the

问题 I'm having a similar question to this one (subtract value from previous row by group), but I want to subtract the previous date from the current date, by group ID in order to have an estimated number of days. I tried editing the scripts suggesed previously by replacing "value" by "date". Although I tried different suggested methods, but i keep getting this error message "Error in mutate_impl(.data, dots) : Evaluation error: unable to find an inherited method for function first for signature

问题 Suppose I have a table below. I'd like to have a counter to count the # of times when a Customer (there are many) is in Segment A. If the Customer jumps to a different Segment between 2 quarters, the counter will reset when the Customer jumps back to Segment A. I am sure there are many ways to do it, but I just can't figure this out..Please help. Thank you! Quarter Segment Customer *Counter* Q1 2018 A A1 1 Q2 2018 A A1 2 Q3 2018 A A1 3 Q4 2018 B A1 1 Q1 2019 B A1 2 Q2 2019 A A1 1 Q1 2020 A A1

问题 Suppose I have a table below. I'd like to have a counter to count the # of times when a Customer (there are many) is in Segment A. If the Customer jumps to a different Segment between 2 quarters, the counter will reset when the Customer jumps back to Segment A. I am sure there are many ways to do it, but I just can't figure this out..Please help. Thank you! Quarter Segment Customer *Counter* Q1 2018 A A1 1 Q2 2018 A A1 2 Q3 2018 A A1 3 Q4 2018 B A1 1 Q1 2019 B A1 2 Q2 2019 A A1 1 Q1 2020 A A1

问题 I have data.table set.seed(1) dat <- data.table(Shift = c(c(0,0,0,1,2,1,1)), Value = rnorm(7),I.Value = rnorm(7)) dat Shift Value I.Value 0 -0.6264538 0.7383247 0 0.1836433 0.5757814 0 -0.8356286 -0.3053884 1 1.5952808 1.5117812 2 0.3295078 0.3898432 1 -0.8204684 -0.6212406 1 0.4874291 -2.2146999 I want the new column to be shift(Value,Shift,fill=0). Hence the result should be- Shift Value I.Value new.value new.I.value 0 -0.6264538 0.7383247 -0.6264538 0.7383247 0 0.1836433 0.5757814 0

问题 I`m writing on SQL Server 2012 in this SQL Function ;With Quote as ( SELECT SID,SHEET,Code, Date, Data, LAG(Data) OVER(ORDER BY Date) As LastMonthData FROM RMQ_DATA WHERE [SHEET] IN(0) ) SELECT [Quote].[SID], Quote.DATE,Quote.DATA,Quote.SHEET, Quote.CODE, CASE WHEN ISNULL(LastMonthData, 0) = 0 THEN null ELSE (LastMonthData/Data) * 100 END As Quote, RMQ_SUBCAT.TARGET_CODE, RMQ_SUBCAT.RMQ_SUBCAT, RMQ_CAT.RMQ_CAT_NAME, RMQ_CAT.ENABLED FROM Quote Left outer Join RMQ_SUBCAT on Quote.CODE =RMQ

问题 I am using Redshift and want to receive the last non-Null value by userid. Here is an example dataset: Date UserID Value 4-18-2018 abc 1 4-19-2018 abc NULL 4-20-2018 abc NULL 4-21-2018 abc 8 4-19-2018 def 9 4-20-2018 def 10 4-21-2018 def NULL 4-22-2018 tey NULL 4-23-2018 tey 2 If the new user starts out with a NULL then replace with 0. I want my final dataset to look like this: Date UserID Value 4-18-2018 abc 1 4-19-2018 abc 1 4-20-2018 abc 1 4-21-2018 abc 8 4-19-2018 def 9 4-20-2018 def 10 4

问题 I'm creating drawing application for iOS. To draw something with a touch I used a code from this tutorial: http://www.raywenderlich.com/18840/how-to-make-a-simple-drawing-app-with-uikit My code that I use for drawing is the following: - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { mouseSwiped = NO; UITouch *touch = [touches anyObject]; lastPoint = [touch locationInView:self.view]; } - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { mouseSwiped = YES;