[R] Summing over specific columns in a matrix
Hi, I would like to sum some specific columns in my matrix- for example, my matrix looks like this: [,1] [,2] [,3] [,4] [,5] [1,]1 NA NA NA NA [2,]21 NA1 NA [3,]321 21 [4,]432 32 [5,] NA NA NA43 [6,] NA NA NA5 NA I would like to find the sum of the first two columns, the second two columns and the last column: i.e I am left with a vector of c(16, 18, 6). I know about colSums and sum overall- I just wondered if this type of grouping can be included somehow in a vector such as c(2,2,1)? I don't really want to have to use a loop for this. Many thanks Emma -- View this message in context: http://r.789695.n4.nabble.com/Summing-over-specific-columns-in-a-matrix-tp3179400p3179400.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Summing over specific columns in a matrix
Try this: rowSums(rowsum(t(m), rep(1:3, c(2, 2, 1)), na.rm = TRUE)) On Fri, Jan 7, 2011 at 2:29 PM, emj83 stp08...@shef.ac.uk wrote: Hi, I would like to sum some specific columns in my matrix- for example, my matrix looks like this: [,1] [,2] [,3] [,4] [,5] [1,]1 NA NA NA NA [2,]21 NA1 NA [3,]321 21 [4,]432 32 [5,] NA NA NA43 [6,] NA NA NA5 NA I would like to find the sum of the first two columns, the second two columns and the last column: i.e I am left with a vector of c(16, 18, 6). I know about colSums and sum overall- I just wondered if this type of grouping can be included somehow in a vector such as c(2,2,1)? I don't really want to have to use a loop for this. Many thanks Emma -- View this message in context: http://r.789695.n4.nabble.com/Summing-over-specific-columns-in-a-matrix-tp3179400p3179400.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40 S 49° 16' 22 O [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Summing over specific columns in a matrix
On Fri, Jan 7, 2011 at 8:42 AM, Henrique Dallazuanna www...@gmail.com wrote: Try this: rowSums(rowsum(t(m), rep(1:3, c(2, 2, 1)), na.rm = TRUE)) On Fri, Jan 7, 2011 at 2:29 PM, emj83 stp08...@shef.ac.uk wrote: Hi, I would like to sum some specific columns in my matrix- for example, my matrix looks like this: [,1] [,2] [,3] [,4] [,5] [1,] 1 NA NA NA NA [2,] 2 1 NA 1 NA [3,] 3 2 1 2 1 [4,] 4 3 2 3 2 [5,] NA NA NA 4 3 [6,] NA NA NA 5 NA I would like to find the sum of the first two columns, the second two columns and the last column: i.e I am left with a vector of c(16, 18, 6). Can you help me extend this example? I'd like to get (PL_Pos - Costs) for each row in Data1, sum those results for each matching date in Result1, and put the result in a new column in Result1 called 'Daily'. Been messing with this for an hour now. Nothing comes close. Thanks, Mark Result1 = structure(list(TradeDates = structure(c(14249, 14250, 14251, 14252, 14253, 14256, 14257, 14258, 14259, 14260, 14263, 14264 ), class = Date)), .Names = TradeDates, row.names = c(NA, 12L), class = data.frame) Data1 = structure(list(Trade = c(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22), PosType = c(1, 1, -1, -1, -1, -1, -1, 1, -1, -1, -1, 1, 1, -1, -1, 1, 1, -1, 1, 1, 1, -1), EnDate = structure(c(14249, 14250, 14251, 14253, 14256, 14256, 14256, 14257, 14258, 14258, 14259, 14259, 14260, 14264, 14264, 14265, 14266, 14267, 14270, 14271, 14273, 14274), class = Date), EnTime = c(1406, 1318, 838, 846, 846, 1038, 1102, 918, 838, 950, 1134, 1254, 1110, 846, 1318, 854, 950, 838, 1246, 838, 854, 902), ExDate = structure(c(14249, 14250, 14251, 14253, 14256, 14256, 14256, 14257, 14258, 14258, 14259, 14259, 14260, 14264, 14264, 14265, 14266, 14267, 14270, 14271, 14273, 14274 ), class = Date), ExTime = c(1515, 1515, 1030, 942, 1030, 1046, 1110, 1515, 942, 1030, 1142, 1515, 1515, 1030, 1326, 1515, 1515, 1030, 1515, 1515, 1515, 1022), PL_Pos = c(133.5, -41.5, 171, 483.5, 333.5, -29, -54, -291.5, 596, -141.5, -54, 558.5, 533.5, 521, -41.5, 883.5, 358.5, -979, -191.5, 196, -791.5, 446), Costs = c(29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29 ), PL = c(104.5, -70.5, 142, 454.5, 304.5, -58, -83, -320.5, 567, -170.5, -83, 529.5, 504.5, 492, -70.5, 854.5, 329.5, -1008, -220.5, 167, -820.5, 417)), .Names = c(Trade, PosType, EnDate, EnTime, ExDate, ExTime, PL_Pos, Costs, PL ), row.names = c(NA, 22L), class = data.frame) Result1 Data1 __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Summing over specific columns in a matrix
Hi: It's impolite on this list to hijack a thread to ask your own question. Please start a new thread in the future if you have a question of your own. Re your question, try this: Data1$Daily - with(Data1, PL_Pos - Costs) Data1Sum - aggregate(Daily ~ EnDate, FUN = sum) # Merge the two data frames merge(Result1, Data1Sum, by.x = 'TradeDates', by.y = 'EnDate', all.x = TRUE)) If this is the result you wanted, save it as Result1. If you don't want the NAs, remove the all.x = TRUE part in the merge() call. HTH, Dennis On Fri, Jan 7, 2011 at 10:21 AM, Mark Knecht markkne...@gmail.com wrote: On Fri, Jan 7, 2011 at 8:42 AM, Henrique Dallazuanna www...@gmail.com wrote: Try this: rowSums(rowsum(t(m), rep(1:3, c(2, 2, 1)), na.rm = TRUE)) On Fri, Jan 7, 2011 at 2:29 PM, emj83 stp08...@shef.ac.uk wrote: Hi, I would like to sum some specific columns in my matrix- for example, my matrix looks like this: [,1] [,2] [,3] [,4] [,5] [1,]1 NA NA NA NA [2,]21 NA1 NA [3,]321 21 [4,]432 32 [5,] NA NA NA43 [6,] NA NA NA5 NA I would like to find the sum of the first two columns, the second two columns and the last column: i.e I am left with a vector of c(16, 18, 6). Can you help me extend this example? I'd like to get (PL_Pos - Costs) for each row in Data1, sum those results for each matching date in Result1, and put the result in a new column in Result1 called 'Daily'. Been messing with this for an hour now. Nothing comes close. Thanks, Mark Result1 = structure(list(TradeDates = structure(c(14249, 14250, 14251, 14252, 14253, 14256, 14257, 14258, 14259, 14260, 14263, 14264 ), class = Date)), .Names = TradeDates, row.names = c(NA, 12L), class = data.frame) Data1 = structure(list(Trade = c(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22), PosType = c(1, 1, -1, -1, -1, -1, -1, 1, -1, -1, -1, 1, 1, -1, -1, 1, 1, -1, 1, 1, 1, -1), EnDate = structure(c(14249, 14250, 14251, 14253, 14256, 14256, 14256, 14257, 14258, 14258, 14259, 14259, 14260, 14264, 14264, 14265, 14266, 14267, 14270, 14271, 14273, 14274), class = Date), EnTime = c(1406, 1318, 838, 846, 846, 1038, 1102, 918, 838, 950, 1134, 1254, 1110, 846, 1318, 854, 950, 838, 1246, 838, 854, 902), ExDate = structure(c(14249, 14250, 14251, 14253, 14256, 14256, 14256, 14257, 14258, 14258, 14259, 14259, 14260, 14264, 14264, 14265, 14266, 14267, 14270, 14271, 14273, 14274 ), class = Date), ExTime = c(1515, 1515, 1030, 942, 1030, 1046, 1110, 1515, 942, 1030, 1142, 1515, 1515, 1030, 1326, 1515, 1515, 1030, 1515, 1515, 1515, 1022), PL_Pos = c(133.5, -41.5, 171, 483.5, 333.5, -29, -54, -291.5, 596, -141.5, -54, 558.5, 533.5, 521, -41.5, 883.5, 358.5, -979, -191.5, 196, -791.5, 446), Costs = c(29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29 ), PL = c(104.5, -70.5, 142, 454.5, 304.5, -58, -83, -320.5, 567, -170.5, -83, 529.5, 504.5, 492, -70.5, 854.5, 329.5, -1008, -220.5, 167, -820.5, 417)), .Names = c(Trade, PosType, EnDate, EnTime, ExDate, ExTime, PL_Pos, Costs, PL ), row.names = c(NA, 22L), class = data.frame) Result1 Data1 __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
