Dear Rui,Thankyou very much for your help. just for my own knowledge what if
want the values and index, which are less than or equal to 80% of the maximum
value other than those in the neighbors?? like if maximum is in row number 5 of
any column then the second maximum can be in any row other than 4 and 6.
similarly if maximum is in row number 12 than the second maximum can be in any
row other than 1 and 11...thankyou very much for your help
elisa
> Date: Fri, 24 May 2013 12:37:37 +0100
> From: ruipbarra...@sapo.pt
> To: eliza_bo...@hotmail.com
> CC: b...@xs4all.nl; r-help@r-project.org
> Subject: Re: [R] Continuous columns of matrix
>
> Hello,
>
> Berend is right, it's at least confusing. To get just the index of the
> maximum value in each column,
>
> apply(mat, 2, which.max)
>
>
> To get that index and the two neighbours (before and after, wraping
> around) if they are greater than or equal to 80% of the maximum, try
>
> fun <- function(x){
> n <- length(x)
> imx <- which.max(x)
> sec <- numeric(2)
> if(imx == 1){
> if(x[n] >= 0.8*x[imx]) sec[1] <- n
> if(x[2] >= 0.8*x[imx]) sec[2] <- 2
> }else if(imx == n){
> if(x[n - 1] >= 0.8*x[imx]) sec[1] <- n - 1
> if(x[1] >= 0.8*x[imx]) sec[2] <- 1
> }else{
> if(x[imx - 1] >= 0.8*x[imx]) sec[1] <- imx - 1
> if(x[imx + 1] >= 0.8*x[imx]) sec[2] <- imx + 1
> }
> sec <- sec[sec != 0]
> c(imx, sec)
> }
>
> apply(mat, 2, fun)
>
>
> Note that the result comes with the maximum first and the others follow.
>
> Hope this helps,
>
> Rui Barradas
>
>
> Em 24-05-2013 11:41, eliza botto escreveu:
> > There you go!!!
> >
> > structure(c(0.706461987893674, 0.998391468394261, 0.72402995269242,
> > 1.70874688194537, 1.93906363083693, 0.89540353128442, 0.328327645695443,
> > 0.427434603701202, 0.591932250254601, 0.444627635494183, 1.44407704434405,
> > 1.79150336746345, 0.94525563730664, 1.1025988539757, 0.944726401770203,
> > 0.941068515436361, 1.50874009152312, 0.590015480056925, 0.311905493999476,
> > 0.596771673581893, 1.01502499067153, 0.803273181849135, 1.6704085033648,
> > 1.57021117646422, 0.492096635764151, 0.433332688044914, 0.521585941816778,
> > 1.66472272302545, 2.61878329527404, 2.19154489521664, 0.493876245329722,
> > 0.4915787202584, 0.889477365620806, 0.609135860199222, 0.739201878930367,
> > 0.854663750519518, 0.948228727226247, 1.38569091844218, 0.910510759802679,
> > 1.25991218521949, 0.993123416952421, 0.553640392997634, 0.357487763503204,
> > 0.368328033777003, 0.344255688489322, 0.423679560916755, 1.32093576037521,
> > 3.13420679229785, 2.06195904001605, 1.41493262330451, 1.35748791897328,
> > 1.19490680241894, 0.7024887561!
8332!
> > 2, 0.338258418490199, 0.123398398622741, 0.138548982660226,
> > 0.16170889185798, 0.414543218677095, 1.84629295875002, 2.24547399004563,
> > 0.0849732189580101, 0.070591276171845, 0.0926010253161898,
> > 0.362209761457517, 1.45769283057202, 3.16165004659667, 2.74903557756267,
> > 1.94633472878995, 1.19319875840883, 0.533232612926756, 0.225531074123974,
> > 0.122949089115578), .Dim = c(12L, 6L))
> >
> > Thanks once again..
> > Elisa
> >
> >
> >> Subject: Re: [R] Continuous columns of matrix
> >> From: b...@xs4all.nl
> >> Date: Fri, 24 May 2013 12:36:47 +0200
> >> CC: r-help@r-project.org
> >> To: eliza_bo...@hotmail.com
> >>
> >>
> >> On 24-05-2013, at 12:24, eliza botto <eliza_bo...@hotmail.com> wrote:
> >>
> >>> Dear useRs,If i have a matrix, say, 12 rows and 6 columns. The columns
> >>> are continuous. I want to find the index of maximum values and the
> >>> actual maximum values. The maximum values in each column are the highest
> >>> values and the values greater than or equal to 80% of the maximum value.
> >>> Moreover, if a column has more than one maximum values than these values
> >>> should come immediately next to each other. For example, if you column 1
> >>> has a highest value in 6th row then the second maximum values cant be in
> >>> row 5 or 7. And as the columns are continuous therefore, if maximum value
> >>> is in row 12th, then the second maximum cant be in row 11 and 1.Thankyou
> >>> very much indeed in advance
> >>
> >>
> >> Incomprehensible.
> >> What is a continuous column?
> >>
> >> Please give an example input matrix and and the result you want.
> >>
> >> Berend
> >>
> >>> Elisa
> >>> [[alternative HTML version deleted]]
> >>>
> >>
> >> Please post in plain text.
> >>
> >
> > [[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.
> >
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