search for: modwt

...ese are my codes, can you help give an advice or idea with my problem: l*ibrary("biOps") library("waveslim") library("xlsReadWrite") x <- readTiff("D:\\FYP\\image\\SignatureImage\\user186g1.tif") y <- imgBlockMedianFilter(x, 5) #Plot image #plot(y) y.modwt <- modwt.2d(y, "la8", 2) ## Level 2 decomposition par(mfrow=c(2,2), pty="s") ##Plot wavelets image(y.modwt$LH2, col=rainbow(128), axes=FALSE, main="LH2") image(y.modwt$HH2, col=rainbow(128), axes=FALSE, main="HH2") image(y.modwt$LL2, col=rainbow(128), axe...

Hi: I have encountered problems with imodwt and universal.thresh.modwt and cannot find any reference in R Search. Hope someone can give me some ideas: Starting with modwt.la8 <- modwt(xdata, "la8", n.level=6) <-- this seems to work fine (1) ydata <- imodwt(modwt.la8) will always give ydata as numeric(...

...these are my codes, can you help give an advice or idea with my problem: /library("biOps") library("waveslim") library("xlsReadWrite") x <- readTiff("D:\\FYP\\image\\SignatureImage\\user186g1.tif") y <- imgBlockMedianFilter(x, 5) #Plot image #plot(y) y.modwt <- modwt.2d(y, "la8", 2) ## Level 2 decomposition par(mfrow=c(2,2), pty="s") ##Plot wavelets image(y.modwt$LH2, col=rainbow(128), axes=FALSE, main="LH2") image(y.modwt$HH2, col=rainbow(128), axes=FALSE, main="HH2") image(y.modwt$LL2, col=rainbow(128), axes...

Airon, I used R2.4.0 on a Windows XP (SP2) (not Chinese :-)) and it still works: > data = read.csv("u:/airon.csv") > xdata = data$Adj..Close > modwt.la8 = modwt(xdata, "la8", n.level=6) > summary(modwt.la8) Length Class Mode d1 1467 -none- numeric d2 1467 -none- numeric d3 1467 -none- numeric d4 1467 -none- numeric d5 1467 -none- numeric d6 1467 -none- numeric s6 1467 -none- numeric > ydata = imodwt(modwt.la...

...) Let me explain. First of all, change your lines to xdata <- ckhdat$Adj..Close[1:1447] #names(ckhdwt.la8) <- c("w1", "w2", "w3", "w4", "w5","w6", "v6") note the # sign, i.e., DO NOT change the names before the function imodwt. This is because the function imodwt looks for the names created by the modwt function. If you need to change names, do it AFTER the reconstruction. I hope that it helps you. Rogerio ---------- Cabe?alho original ----------- De: "Airon Yiu" aironyiu at yahoo.com.hk Para: "rdport...

I would like to create a vector of pairlist (flag, binary_value) like: (variable ="TrendOff", value = 0) (variable ="MOdwt", value = 1) (variable ? "ZeroPadding", value =1) ................................................ I tried the following syntax but the emcompassing list (that I called "flags") is not made up of pairlists. Instead it is made up of two apparently disjoint lists:...

Hello, I get the following message when I try to load a time series of 128 stock returns. Error in modwt(stock, wf = "la8", n.levels = 8, boundary = "periodic") : wavelet transform exceeds sample size in modwt I thought that MODWT had no restrictions on the sample size? Any help? -- View this message in context: http://www.nabble.com/MODWT-exceeds-sample-size-tf218321...

Airon, I'm not sure I have understood your question. Anyway, it seems to me that you'll have to code a little. Take a look at ?modwt. I think you'll have to put zeros each scale a time except the one you want to reconstruct. Then do imodwt. After some small loop, I think you'll get the desired result. HTH, Rogerio. ---------- Cabe?alho original ----------- De: "Airon Yiu" aironyiu at yahoo.com.hk Para: &quo...

Hi everyone I am using the wavelet and waveslim package in R to find the wave variance.Here is the code return.modwt<-modwt(X, filter="la8", n.levels=5, boundary="periodic", fast=TRUE) return.modwt.var<- wave.variance(return.modwt, type="nongaussian") Where X is a uni-variate time series. I am expecting a matrix with 5 rows(no. of levels) and 3 columns(variance,upper bound,...

> wt.filter("d8") #### HOW COME ???? Error in validObject(.Object) : invalid class "wt.filter" object: invalid object for slot "transform" in class "wt.filter": got class "function", should be or extend class "character" > wt.filter("d10") # OK An object of

Dear R Users, For running wavelet functions using dwt( ), modwt( ), and mra( ), a wavelet filter algorithm is applied. For all these functions, default is "la8" and other possibility is "haar". In related documents, another possibilities like as symlet and coiflet ... are not cited. Besides "la8" and "haar", which w...

...e' Any tips how I can resolve this? > > library("waveslim") > > vols=read.csv(file="C:/Users/ocuk/My Documents/Abs Vol.csv", header=TRUE, > sep=",") > x<-c(vols[,1]) > #x > #data(ibm) > av.la8 <- mra(x, "la8", 4, "modwt") > #names(av.la8) <- c("d1", "d2", "d3", "d4","d5","d6", "d7", "d8","s8") > names(av.la8) <- c("d1", "d2", "d3", "d4","s4") > #par(mfcol=c...

...t;periodic", fast=TRUE) filter Either a wt.filter object, a character string indicating which wavelet filter to use in the decomposition, or a numeric vector of wavelet coefficients (not scaling coefficients). See help(wt.filter) for acceptable filter names wt.filter(filter="la8", modwt=FALSE) Arguments filter A character string indicating which wavelet transform filter to compute .... Details The character strings currently supported are derived from one of four classes of wavelet transform filters: Daubechies, Least Asymetric, Best Localized and Coiflet. The prefixes for filte...

...to the time domain." Question: What does 'scales larger than 1000 trading days' mean? Does it mean all coefficients ?of order more than 10 (1024=2^10) equal to zero? Or am I missing something? Rogerio's?solution [Thu 16 Nov 2006 - 20:54:25 GMT] doesn't seem to work{waveslim, modwt, la8, boundary=periodic, serieslength=3464}; also tried with la4, but the reconstruction is too smooth, almost flat.?Any help will be appreciated. regards, pradeep