ppoly | R Documentation |
This function generates Piecewise polynomial function values for n equally spaced points in [0,1].
ppoly(norx=1024)
norx |
the number of data or x values in [0, 1] |
Piecewise polynomial function with the discontinuity is introduced by Nason and Silverman (1994) and is useful test function evaluating a wavelet shrinkage method.
Piecewise polynomial function values f(i/n), i=1,…,n and its variability ||f|| = ∑_{i=1}^n (f_i - mena(f))^2 / (n-1) where mena(f) = ∑_{i=1}^n f_i / n.
Nason, G.P. and Silverman, B.W. (1994) The discrete wavelet transform in S. Journal of Computational and Graphical Statistics, 3, 163–191.
dopp
, heav
, fg1
.
testpoly <- ppoly(1024) plot(testpoly$x, testpoly$meanf, xlab="", ylab="", main="Plot of Piecewise polynomial function", type="l")
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