lag

How to create lag variables

强颜欢笑 提交于 2019-12-09 13:29:17
问题 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,

QuartzCore shadow - lag UITableView?

时光总嘲笑我的痴心妄想 提交于 2019-12-08 12:15:46
问题 I have an UITableView (NOTE:The UITableView is in a UIView) and I thought it would be nice to have an shadow added below it. I add the shadow with QuartzCore and it turns out really nice. But I also notice that when I come back from a 'Detail View' the animation back to the root is a bit lag. I've heard that QuartzCore and CoreAnimation can make the app slower, or in this case, add lag. First, am I right that CoreAnimation makes the app slower? If so, how can I keep my shadow but remove the

PostgreSQL Window Functions Ignore Null Values

拥有回忆 提交于 2019-12-08 09:25:39
问题 I am relatively new to PostgreSQL and am having a difficult time trying to implement the lag() function while ignoring null values. According to the docs, http://www.postgresql.org/docs/9.4/static/functions-window.html, it is not possible to simply pass a parameter to the function to achieve this. Does anyone know of any workaround? You can make up any example but if it helps here is something to get you started: Col_A Col_B Col_A_Lag Col_B_Lag ID Date VA_1 100 VA_1 100 AA Jan-1 null null VA

Lags in R within specific subsets?

丶灬走出姿态 提交于 2019-12-08 08:12:08
问题 Suppose I have the following dataframe: df <- data.frame("yearmonth"=c("2005-01","2005-02","2005-03","2005-01","2005-02","2005-03"),"state"=c(1,1,1,2,2,2),"county"=c(3,3,3,3,3,3),"unemp"=c(4.0,3.6,1.4,3.7,6.5,5.4)) I'm trying to create a lag for unemployment within each unique state-county combination. I want to end up with this: df2 <- data.frame("yearmonth"=c("2005-01","2005-02","2005-03","2005-01","2005-02","2005-03"),"state"=c(1,1,1,2,2,2),"county"=c(3,3,3,3,3,3),"unemp"=c(4.0,3.6,1.4,3.7

Lag in dataframe

泪湿孤枕 提交于 2019-12-08 06:38:30
问题 I have a dataframe like ID_CASE Month CS00000026A 201301 CS00000026A 201302 CS00000026A 201303 CS00000026A 201304 CS00000026A 201305 CS00000026A 201306 CS00000026A 201307 CS00000026A 201308 CS00000026A 201309 CS00000026A 201310 CS00000191C 201302 CS00000191C 201303 CS00000191C 201304 CS00000191C 201305 CS00000191C 201306 CS00000191C 201307 CS00000191C 201308 CS00000191C 201309 CS00000191C 201310 I want the final data frame to have three additional column like ID_CASE Month Lag_1 Lag_2 Lag_3

R - How can I check if a value in a row is different from the value in the previous row?

ε祈祈猫儿з 提交于 2019-12-08 03:13:52
问题 I would like to add a column to my table that compares a value with a previous value in an existing column 'farm' (to check if it is the same); and also controls if the value in the current row is "NULL". The objective is to get back in the new column 'switch' the value "new" when the value in the column 'farm' for that row is different from the value in the previous row for the column 'farm'. (exept when the value in farm is "NULL", then I would like to get back "") See here below the

R - How can I check if a value in a row is different from the value in the previous row?

倾然丶 夕夏残阳落幕 提交于 2019-12-07 15:48:28
I would like to add a column to my table that compares a value with a previous value in an existing column 'farm' (to check if it is the same); and also controls if the value in the current row is "NULL". The objective is to get back in the new column 'switch' the value "new" when the value in the

Cache whats being draw on MapView in Android

て烟熏妆下的殇ゞ 提交于 2019-12-07 09:41:22
问题 I am developing an app for my Universities campus that displays the campus in a MapView; then using geopoints draws the outlines of the buildings on campus on the mapView using the draw method a class that extents Overlay. There are about 50-60 buildings being drawn, resulting in a very laggy map as the draw method constantly gets drawn over and over. I have looked into my problem and I have found some people mentioning drawing the buildings on a canvas, but I have found no good examples or

Eclipse - Android GUI designer incredibly laggy and memory intensive

隐身守侯 提交于 2019-12-07 08:51:14
问题 I am having serious issues with the Android GUI designer. I used to be able to edit views just fine, but I was very far behind on updates. Once updated, the GUI editor started to lag. The Image-Buttons in this picture continuously flash as soon as I edit a property on a view. And memory usage skyrockets. Task Manager showed my RAM being completely maxed out at 8 gigs. (javaw.exe ~6.5 gigs of memory usage) As soon as I switch away from the GUI editor (over to the code editor) it stops lagging,

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