[R] only 0s may be mixed with negative subscripts
I'd like to get the sum of every other row in a data.frame. When I
actually set about doing this, I get the error in the subject line of
this message. A sample of my data is below, followed by the function
call that should give me the results I want:
dput(head(sens2))
structure(list(Time = c(1328565067, 1328565067.05, 1328565067.1,
1328565067.15, 1328565067.2, 1328565067.25), Y = c(0.0963890795246276,
0.227296347215609, 0.240972698811569, 0.221208948983498, 0.230898231782485,
0.203282153087549), X = c(0.0245045248243853, 0.0835679411703579,
0.0612613120609633, 0.058568910563872, 0.0511868450318788, 0.0557714205674231
), rownumber = 1:6), .Names = c(Time, Y, X, rownumber
), row.names = c(NA, 6L), class = data.frame)
speedX - sapply(sens2[sens2$rownumber %% 2 == 0,], function(row) {
cumsum(c(sens2[row+1,3], sens2[row,3]))}, simplify=TRUE)
Error in xj[i] : only 0's may be mixed with negative subscripts
Help?
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Re: [R] only 0s may be mixed with negative subscripts
The function you posted runs without error (on these 6 lines), but
does not return anything that looks remotely like a sum, or cumsum of
anything. Can you clarify what you are trying to do? I assume by sum
of every other row you don't mean summing Time, X and Y for rows
1,3,5,..., ?
For the sum of sens2[c(1,3,5,...),] for every column (assuming no NA's
in the data) you could
(1:nrow(sens2) %% 2) %*% as.matrix(sens2)
Time Y X rownumber
[1,] 3985695201 0.56826 0.1369527 9
Hope this helps
On Mon, Feb 13, 2012 at 11:56 AM, Hasan Diwan hasan.di...@gmail.com wrote:
I'd like to get the sum of every other row in a data.frame. When I
actually set about doing this, I get the error in the subject line of
this message. A sample of my data is below, followed by the function
call that should give me the results I want:
dput(head(sens2))
structure(list(Time = c(1328565067, 1328565067.05, 1328565067.1,
1328565067.15, 1328565067.2, 1328565067.25), Y = c(0.0963890795246276,
0.227296347215609, 0.240972698811569, 0.221208948983498, 0.230898231782485,
0.203282153087549), X = c(0.0245045248243853, 0.0835679411703579,
0.0612613120609633, 0.058568910563872, 0.0511868450318788, 0.0557714205674231
), rownumber = 1:6), .Names = c(Time, Y, X, rownumber
), row.names = c(NA, 6L), class = data.frame)
speedX - sapply(sens2[sens2$rownumber %% 2 == 0,], function(row) {
cumsum(c(sens2[row+1,3], sens2[row,3]))}, simplify=TRUE)
Error in xj[i] : only 0's may be mixed with negative subscripts
Help?
--
Sent from my mobile device
Envoyait de mon portable
__
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.
__
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] only 0s may be mixed with negative subscripts
On 13 February 2012 14:46, ilai ke...@math.montana.edu wrote: The function you posted runs without error (on these 6 lines), but does not return anything that looks remotely like a sum, or cumsum of anything. Can you clarify what you are trying to do? I assume by sum of every other row you don't mean summing Time, X and Y for rows 1,3,5,..., ? I'm trying to get a piecewise sum of every n rows in a given column in this data set. For the sum of sens2[c(1,3,5,...),] for every column (assuming no NA's in the data) you could I do format checking well before getting to this stage in the analysis. (1:nrow(sens2) %% 2) %*% as.matrix(sens2) That does not do what I want... Again, what it should return is a list of the sum of the current and preceding row. -- Sent from my mobile device Envoyait de mon portable __ 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] only 0s may be mixed with negative subscripts
Like this ? sum every batch of n rows? N - 2 t(kronecker(diag(nrow(sens2)/N),rep(1,N))) %*% as.matrix(sens2) Time Y X rownumber [1,] 2657130134 0.3236854 0.1080725 3 [2,] 2657130134 0.4621816 0.1198302 7 [3,] 2657130134 0.4341804 0.106958311 Check rownumber column: 1+2 = 3, 3+4 = 7, 5+6=11 ... Or sum every 3 rows: N - 3 t(kronecker(diag(nrow(sens2)/N),rep(1,N))) %*% as.matrix(sens2 ) Time Y X rownumber [1,] 3985695201 0.5646581 0.1693338 6 [2,] 3985695202 0.6553893 0.165527215 Hope this helps (more...). On Mon, Feb 13, 2012 at 4:04 PM, Hasan Diwan hasan.di...@gmail.com wrote: On 13 February 2012 14:46, ilai ke...@math.montana.edu wrote: The function you posted runs without error (on these 6 lines), but does not return anything that looks remotely like a sum, or cumsum of anything. Can you clarify what you are trying to do? I assume by sum of every other row you don't mean summing Time, X and Y for rows 1,3,5,..., ? I'm trying to get a piecewise sum of every n rows in a given column in this data set. For the sum of sens2[c(1,3,5,...),] for every column (assuming no NA's in the data) you could I do format checking well before getting to this stage in the analysis. (1:nrow(sens2) %% 2) %*% as.matrix(sens2) That does not do what I want... Again, what it should return is a list of the sum of the current and preceding row. -- Sent from my mobile device Envoyait de mon portable __ 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. __ 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] only 0s may be mixed with negative subscripts
Hello, I'm trying to get a piecewise sum of every n rows in a given column in this data set. Is this it? # Result as a matrix, each column a piecewise cumsum mat - sapply(which(sens2$rownumber %% 2 == 0), function(row) cumsum(c(sens2[row-1, 3], sens2[row, 3]))) # The same but c() makes it a vector vec - c(sapply(which(sens2$rownumber %% 2 == 0), function(row) cumsum(c(sens2[row-1, X], sens2[row, X] # See the results data.frame(sens2, CumSum=vec) If this is what you want, return to your original 'sapply' instruction and see that you were passing entire rows to 'function(row)', not just row numbers. It was too complicated. (If it's not, sorry, but I missed the point.) Hope this helps, Rui Barradas -- View this message in context: http://r.789695.n4.nabble.com/only-0s-may-be-mixed-with-negative-subscripts-tp4384887p4385803.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.
