On Sat, Jan 22, 2011 at 12:13:35PM +0530, pratik wankhade wrote:
I have a problem as follows:
1. If we have 3 matrices A,B,C and we merge them in a single matrix ABC by
any method like addition , subtraction division,multiplication,etc
2. and then we want to retrieve original 3 matrices
I have a problem as follows:
1. If we have 3 matrices A,B,C and we merge them in a single matrix ABC by
any method like addition , subtraction division,multiplication,etc
2. and then we want to retrieve original 3 matrices A,B,C from single ABC
matrix
What will be the algorithm?
hi, All.
DateDtime Hour Min Second Rep App_dur
9 2006-02-22 14:36:11 14 36 11 4 1
10 2006-02-22 14:36:12 14 36 12 3 86
11 2006-02-22 14:37:38 14 37 38 0 58
14 2006-02-22 14:38:36 14 38 36 3 1
15 2006-02-22 14:38:37 14 38
You can assign a group number to each run of identical
values of 'Rep' with
firstInRun - with(data, c(TRUE, Rep[-1]!=Rep[-length(Rep)]))
group - cumsum(firstInRun)
where 'data' is your data.frame's name. Once you've
assigned the runs to groups then you can use, e.g.,
sapply(split()) to
4 matches
Mail list logo