scalingshift.dwt(wavelets)
scalingshift.dwt()所属R语言包:wavelets
Find Circular Shift of DWT Scaling Coefficients
循环移位DWT缩放系数
译者:生物统计家园网 机器人LoveR
描述----------Description----------
Finds circular shift of DWT scaling coefficients at a specified level, for a specified filter length.
查找循环移位DWT缩放系数,在指定的范围,在指定的过滤器的长度。
用法----------Usage----------
scalingshift.dwt(L, j, N = NULL)
参数----------Arguments----------
参数:L
Length of wavelet transform filter used.
小波变换过滤器的长度。
参数:j
Level of DWT scaling coefficients to be shifted.
DWT缩放系数的水平转移。
参数:N
Length of original time series sample.
原始时间序列样本的长度。
Details
详细信息----------Details----------
This function computes the circular shift associated with a wavelet transform filter of length L and level j. L must be of even length.
此函数计算循环移位与小波变换过滤器的长度L的j。 L必须是偶数长度。
Each coefficient's index will be circularly shifted forward by the value outputted. For example, if we have a vector of DWT scaling coefficients (with NAs inserted) with indices 1,2,3,4,5,6,7,8 and the value outputted from the function scalingshift.dwt is 2, the new order of the vector of aligned DWT wavelet coefficients would be 7,8,1,2,3,4,5,6.
每个系数的索引将被循环移位的输出值。例如,如果我们有一个向量与DWT的缩放系数(使用NAS插入)的指数1,2,3,4,5,6,7,8,输出从的功能scalingshift.dwt中的价值是2,对齐DWT小波系数的矢量新秩序将是7,8,1,2,3,4,5,6。
If N is specified, the function will output the "shift" Modulo N. Because the shift is circular, the value outputted when N is specified is equivalent to the case when N is not specified.
如果N指定,该函数将输出“移位”模N.因为是圆形的转变,N被指定时,输出的值是相当于没有指定的情况下,当N。
This function calculates the absolute value of vjH in formulas (114c) in Wavelet Methods for Time Series Analysis by Percival and Walden (2000). (And optionally vjH Modulo N)
此函数计算的绝对值VJH式(114C)在波斯富街和Walden(2000年)的时间序列分析的小波方法。 (和可选VJH模n的)
值----------Value----------
参数:shift
Circular shift for specified level of DWT scaling coefficients for a specified filter length.
指定级别的DWT缩放系数为指定的过滤器长度的循环移位。
(作者)----------Author(s)----------
Kelvin Ma, kkym@u.washington.edu
参考文献----------References----------
Series Analysis, Cambridge University Press.
参见----------See Also----------
waveletshift.dwt and plot.dwt
waveletshift.dwt和plot.dwt
实例----------Examples----------
# Finding the circular shift for a wavelet transform filter of length 8,[寻找循环移位小波变换滤波器的长度为8,]
# pertaining to DWT Scaling Coefficients of level 5.[有关DWT 5级的缩放系数。]
scalingshift.dwt(8, 5)
# If the sample size of the original time series is of length 1024.[如果样本大小的原始时间序列的长度为1024。]
scalingshift.dwt(8, 5, N = 1024)
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注:
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