sumifs

I have managed to do this in excel easily but want to complete this in R: I have two data frames: MediaPlanDF (215 obs, 29 var) I am only concerned with 4 of the variables: Start Date (flight date), End Date (flight date), Daily Spend, Daily impressions OutputDF (35 obs, 1 var) Date: OutputDF[[1]] 35 observations from 8/31/15 to 10/4/15 So that is the setup, or at least how I have set it up (all dates formatted properly). What I need to do is essentially add 2 columns to ouputDF: Daily Impressions & Daily Spend Daily Impressions = if the date in OutputDF falls within the start and end date of

New to R. Small rep of my df: PTS_TeamHome <- c(101,87,94,110,95) PTS_TeamAway <- c(95,89,105,111,121) TeamHome <- c("LAL", "HOU", "SAS", "MIA", "LAL") TeamAway <- c("IND", "LAL", "LAL", "HOU", "NOP") df <- data.frame(cbind(TeamHome, TeamAway,PTS_TeamHome,PTS_TeamAway)) df TeamHome TeamAway PTS_TeamHome PTS_TeamAway LAL IND 101 95 HOU LAL 87 89 SAS LAL 94 105 MIA HOU 110 111 LAL NOP 95 121 Imagine these are the first four games of a season with 1230 games. I want to calculate the cumulative points per game (mean) at any given time for the home team and the visiting team. The output would look

I am trying to create a SUMIF function that dynamically adds up values in a specific column of a named range in my Excel sheet. It is very easy to do this when there is no named range : The formula picks out all the cells that contain "London" in their name and sums up the expenses related to London. What I am trying to do is to use a named range called TripsData (A2:B5) and tell the SUMIF function to sum the entries in the column 2 of this range that meet the criterion of having London in their name. How can I make this work without needing to create a second named range for column 2 and

I have a matrix like this A=[ 1 2; 2 3; 3 4; 4 5; 5 6; 6 8; 7 9; 8 5; 9 4] Now I want to add a second column the condition is that if limit=0, and interval=3 and limit=limit+interval, or in other words, I have to sum column 2 when values of column 1, ranges like 0 to 3, 3 to 6, 6 to 9, and 9 to 12, and i want sum of corresponding values of column 2. my solution will be like that range- sum 0 to 3 9 3 to 6 19 6 to 9 18 like that I have a matrix of around 7000x2. In place of range just serial no may also be given. This is just an example. This is a job for ACCUMARRAY . First, you construct an