lag

问题 I have a complex animation sequence involving fades and transitions in JavaScript. During this sequence, which consists of four elements changing at once, a setTimeout is used on each element. Tested in Internet Explorer 9, the animation works at realtime speed (it should take 1.6 seconds and it took exactly 1.6 seconds). ANY other browser will lag horribly, with animation times of 4 seconds (Firefox 3 and 4, Chrome, Opera) and something like 20 seconds in IE 8 and below. How can IE9 go so

问题 This is similar to this dplyr lag post, and this dplyr mutate lag post, but neither of those ask this question about defaulting to the input value. I am using dplyr to mutate a new field that's a lagged offset of another field (that I've converted to POSIXct). The goal is, for a given ip, I'd like to know some summary statistics on the delta between all the times it shows up on my list. I also have about 12 million rows. The data look like this (prior to mutation) ip hour snap 192.168.1.2

问题 I have irregular time series data frame with time (seconds) and value columns. I want to add another column, value_2 where values are lead by delay seconds. So value_2 at time t equals to value at time t + delay or right after that. ts=data.frame( time=c(1,2,3,5,8,10,11,15,20,23), value=c(1,2,3,4,5,6,7,8,9,10) ) ts_with_delayed_value <- add_delayed_value(ts, "value", 2, "time") > ts_with_delayed_value time value value_2 1 1 1 3 2 2 2 4 3 3 3 4 4 5 4 5 5 8 5 6 6 10 6 8 7 11 7 8 8 15 8 9 9 20 9

问题 I have irregular time series data frame with time (seconds) and value columns. I want to add another column, value_2 where values are lead by delay seconds. So value_2 at time t equals to value at time t + delay or right after that. ts=data.frame( time=c(1,2,3,5,8,10,11,15,20,23), value=c(1,2,3,4,5,6,7,8,9,10) ) ts_with_delayed_value <- add_delayed_value(ts, "value", 2, "time") > ts_with_delayed_value time value value_2 1 1 1 3 2 2 2 4 3 3 3 4 4 5 4 5 5 8 5 6 6 10 6 8 7 11 7 8 8 15 8 9 9 20 9

问题 I started building a python tkinter gui, the problem is, after adding many features to the gui, the loading started looking really ugly . When starting the mainloop, a blank window shows up for a few miniseconds before the widgets are loaded, the same happens with the other Toplevel windows ( except the ones with few static elements that don't need updates ). My question is Is there a way to 'preload' the window so that when I would call it, it would start smoothly? For example root =

问题 This issue has shown up in several other question here on SO: Slow start for AVAudioPlayer the first time a sound is played Delay in playing sounds using AVAudioPlayer I've tried implementing the fixes suggested but none of them are solving my problem. My application presents the user with a grid of objects to touch, when an object is touched a sound is played. This works great except on the initial touch there is a delay of ~2 seconds. To get around this I initialize my audio player with a

问题 i have a table like this: Number Price Type Date Time ------ ----- ---- ---------- --------- 23456 0,665 SV 2014/02/02 08:00:02 23457 1,3 EC 2014/02/02 07:50:45 23460 0,668 SV 2014/02/02 07:36:34 For each EC I need previous/next SV price. In this case, the query is simple. Select Lag(price, 1, price) over (order by date desc, time desc), Lead(price, 1, price) over (order by date desc, time desc) from ITEMS But, there are some special cases where two or more rows are EC type: Number Price Type

问题 I have a data.table that looks like this: DT <- data.table(A=1:20, B=1:20*10, C=1:20*100) DT A B C 1: 1 10 100 2: 2 20 200 3: 3 30 300 4: 4 40 400 5: 5 50 500 ... 20: 20 200 2000 I want to be able to calculate a new column "G" that has the first value as the average of the first 20 rows in column B as the first value, and then I want to use the first row of column G to help calculate the next row value of G. Say the Average of the first 20 rows of column B is 105, and the formula for the next

问题 Hope all the SQL GURUS out there are doing great :) I am trying to simulate LEAD() and LAG() functionality in SQL Server 2008. This is my scenario: I have a temp table which is populated using the base query with the business logic for mileage. I want to calculate accumulated mileage for each user per day. The temp table is setup using ROW_NUMBER() , so I have all the data needed in the temp table except the accumulated mileage. I have tried using a CTE with the base query and self joining

问题 Can anyone give insight as to why a JPanel that is drawing simple shapes such as rectangles, in small quantity, could lag noticeably when resizing the frame? I think that by adding an event for window resize and timing the resize to 1/10 s or so, I could solve the problem. But I'm not so sure. EDIT: After reviewing the example code I found that the resize lag is due to having a handler that scales drawn objects by getting the height and width of the screen. this.addComponentListener(new