search for: s_n

Hi, is there a R function that order a matrix according to some criteria based on the rows(or cols) of that matrix? For example, let's say that my matrix S is composed by n rows S_1, S_2,.., S_n and that I compute some real value g_i=g(S_i) for each row. Then I want to order this set of g_i (from smaller to bigger) and order the correspondent row to the new position. Is it possible (apart from looping on the index) to do this with some predefined R function? Thanks, Francesco

...er of these tries, and sounds significantly better. I'm starting to get the impression that (excuse me while I commit what is probably an atrocity wrt to the Vorbis algorithm) the compression used by Vorbis isn't a "stable" sequence, i.e., one for which |S_{n+1} - S_n| < 1/k |S_n - S_{n-1}| otherwise, I suspect that cutting out half the bits would degrade the sound quality significantly, but wouldn't introduce the kinds of artifacts I was hearing. A utility that needs to do some inexpensive analysis of the file (or of each packet) to determine a nearly-...

Hi, I am having trouble using constrOptim. My target is to do a portfolio optimization and there some constraints have to be fulfilled. 1) The weight of each share of the portfolio has to be greater than 0 2) The sum of these weights has to be 1 I am able to fulfill either the first or the second constraint but not both. One simple way would be to fulfill the first constraint by using optim as

Hi anyone coded up Stirling numbers in R? [I need unsigned Stirling numbers of the first kind] cheers Robin -- Robin Hankin Uncertainty Analyst National Oceanography Centre, Southampton European Way, Southampton SO14 3ZH, UK tel 023-8059-7743

Hi, Was wondering if it is possible to pass function name as a parameter, smth along this line param.to.pass<-c(1,'max','h') dd<-function(dfd, param=param.to.pass,...){ ttime.int <- format(ttime,fmt) data.frame( param[3] = tapply(dfd[,param[1]],ttime.int,param[3]), ...) } I know there is a as.formula expression but not quite sure if there is some

...ents in GPLS, but I'm still not sure how to choose the right number of PLS components for my data set. I used the function errorest() from package ipred to estimate the error rates und gpls() with Firth procedure switched on. The attached PDF Graphik illustrates the problem for my data set. S_n is the model sensitivity and S_p the model specifity. With 4 component I get the best crossvalidation error rate 17% and with 5 components the best bootstrap error rate 9%, but the sensitivity of the model is only 11% ! If one choose 13 components, one gets 100% sensitivity and 100% specifity a...

Hi, I am trying to make a sequence and am using a for loop for this. I want to start off with an initial value ie S[0]=0 then use the loop to create other values. This is what I have so far but I just keep getting error messages. #To calculate the culmulative sums: s<-rep(0,207) #as this is the length of the vector I know I will have s<-as.vector(s)

...=VD3G1DxnnVpk4c3nUjQy+KndHDNdcqHi_=wVH@mail.gmail.com> Content-Type: text/plain; charset=ISO-8859-1 Hi, is there a R function that order a matrix according to some criteria based on the rows(or cols) of that matrix? For example, let's say that my matrix S is composed by n rows S_1, S_2,.., S_n and that I compute some real value g_i=g(S_i) for each row. Then I want to order this set of g_i (from smaller to bigger) and order the correspondent row to the new position. Is it possible (apart from looping on the index) to do this with some predefined R function? Thanks, Francesco -------...

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