date - R: replace NA by mean of non-NA values based on a multiple conditions (Hour, Day of Week and Temperature range) -


i have data frame 3 columns: "date/time", "power", "temperature", represents values of power measured, 10 10 minutes, , temperature of outdoor air. entries correspond whole year of data acquiring, result on large number of strings. sampling example:

df1 <- data.frame("date/hour" = c("2016-08-09 12:00", "2016-08-09 12:10", "2016-08-09 12:15", "2016-08-09 12:20"), "power" = c(500.21, 500.23, 500.24, 500.30), "day_week" = c("tuesday", "tuesday", "tuesday", "tuesday"), "temp" = c(21.1, 21.5, 21.3, 21.0))

the problem @ periods, due equipment problem, power value got na values. fill gap, want use mean of non-na values satisfy next 3 conditions:

  1. occur @ same hour.
  2. occur @ same day of week.
  3. (the intriging one) occur @ range of temperature of +/- 0.5, , increases 0.1 if there's no non-na values replace.

to solve problem, first of all, created fourth column in df1, transforms values of "date/hour" column "hour_minute", ignoring date. 

df1$hour_minute <- format(df1$`date/hour`, "%h:%m")

temperature range calculated based on fixed range +/- 0.5 stored in fifth , sixth column of dataframe:

df$upper_temp <- dado_total$temp+0.5 df$lower_temp <- dado_total$temp-0.5

due impossibility of data frame mean calculation, created numeric vector (index) df1 power column: 

index <- subset(df1, select = c(power)) %>% unlist() %>% as.numeric(as.character())

so created seventh column (df1$eq_power) gets mean of index vector based on 3 mentioned conditions using loop:

for (i in 1:length(df1$power)) {   df1$eq_power[i] <- mean(index[which(     df1$hour_minute==df1$hour_minute[i] &     df1$day_week==df1$day_week[i] &     df1$temp<=df1$upper_temp[i] &     df1$temp>=df1$lower_temp[i])]) }

for command returns me profitable result, though large time expenditure , missing values didn't manage use incremental temperature ranges. if me, appreciate lot.


Comments

Post a Comment

Popular posts from this blog

android - InAppBilling registering BroadcastReceiver in AndroidManifest -

i'm implementing inapp billing in android app. works well, however, i'm trying decouple broadcast receiver activity manifest. suggestion in android's trivialdrive sample: // important: dynamically register broadcast messages updated purchases. // register receiver here instead of <receiver> in manifest // because call getpurchases() @ startup, therefore can ignore // broadcasts sent while app isn't running. // note: registering listener in activity bad idea, done here // because sample. regardless, receiver must registered after // iabhelper setup, before first call getpurchases(). currently there's class extends broadcastreceiver : public class iabbroadcastreceiver extends broadcastreceiver { /** * intent action receiver should filter for. */ public static final string action = "com.android.vending.billing.purchases_updated"; private final iabbroadcastlistener mlistener; public iabbroadcastreceiver(iabbroadcastlistener listener) { m...
Read more

python Tkinter Capturing keyboard events save as one single string -

is possible store keyboard events 1 string? code below stores 1 char , prints it. card reader or bar code reader, contains collection of character/ string not 1 character @ time. goal save char pressed text variable. from tkinter import * root = tk() def key(event): text= event.char text+= event.char print ("pressed", text) def callback(event): frame.focus_set() print ("clicked at", event.x, event.y) frame = frame(root, width=100, height=100) frame.bind("<key>", key) frame.bind("<button-1>", callback) frame.pack() root.mainloop() currently, creating text variable , everytime key() function gets called, , text stores last character typed. you can define text module level variable , , use module level text inside key function - text = '' def key(event): global text text+= event.char print("pressed", text)
Read more

sql server - Why does Linq-to-SQL add unnecessary COUNT()? -

here tables: create table customer ( cid int primary key, name varchar(32) ) create table ord ( oid int primary key, cid int foreign key references customer, address varchar(20) ) here's linq-to-sql statement: var aaa = c in db.customer select new { c, o = c.ord.tolist() }; and here's inexplicable query generated linq-to-sql: select [t0].[cid] [cid], [t0].[name] [name], [t1].[oid] [oid], [t1].[cid] [cid2], [t1].[address] [address], (select count(*) [dbo].[ord] [t2] [t2].[cid] = [t0].[cid]) [value] [dbo].[customer] [t0] left outer join [dbo].[ord] [t1] on [t1].[cid] = [t0].[cid] order [t0].[cid], [t1].[oid] i want understand how rid of count(*) part. it's entirely uncalled for! linq needs count(*) in order determine number of entries returned o = c.ord.tolist() .
Read more