waves-16-arma

Simulation of Standing and Propagating Sea Waves with Three-Dimensional ARMA Model
git clone https://git.igankevich.com/waves-16-arma.git
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waves.R (1758B)

      1 #!/usr/bin/Rscript
      2 
      3 arma.bits.qweibull <- function (x, param, sh) {
      4 	sh <- 2.0
      5 	sc = param$mean / gamma(1.0 + 1.0 / sh)
      6 	qweibull(x, shape=sh, scale=sc)
      7 }
      8 arma.bits.qnorm <- function (x, param) {
      9 	qnorm(x, mean=param$mean, sd=param$sd)
     10 }
     11 
     12 arma.QFUNCTIONS <- list(
     13 	elevation = arma.bits.qnorm,
     14   heights_x = function (x, param) { arma.bits.qweibull(x, param, 2.0) },
     15 	heights_y = function (x, param) { arma.bits.qweibull(x, param, 2.0) },
     16 	lengths_x = function (x, param) { arma.bits.qweibull(x, param, 2.3) },
     17 	lengths_y = function (x, param) { arma.bits.qweibull(x, param, 2.3) },
     18 	periods = function (x, param) { arma.bits.qweibull(x, param, 3.0) }
     19 )
     20 
     21 arma.ALL_WAVE_CHARACTERISTICS <- list(
     22 	"elevation",
     23   "heights_x",
     24 	"heights_y",
     25 	"lengths_x",
     26 	"lengths_y",
     27 	"periods"
     28 )
     29 
     30 arma.load_wave_parameters <- function (
     31 	dir = "output",
     32 	wave_params = arma.ALL_WAVE_CHARACTERISTICS,
     33 	qfuncs = arma.QFUNCTIONS
     34 ) {
     35 	sapply(wave_params, function (filename) {
     36 		param <- list()
     37 		param$filename = filename
     38 		param$data <- read.table(file.path(dir, filename))[[1]]
     39 		param$mean <- mean(param$data)
     40 		param$sd <- sd(param$data)
     41 		param$qfunc <- function (x) { qfuncs[[filename]](x, param) }
     42 		param$min <- param$qfunc(.01)
     43 		param$max <- param$qfunc(.99)
     44 		elem <- list()
     45 		elem[[filename]] <- param
     46 		elem
     47 	})
     48 }
     49 
     50 arma.qqplot <- function (param, nsamples=100, ttl, ...) {
     51   qdata <- param$qfunc(ppoints(nsamples))
     52 	qqplot(
     53 		qdata,
     54 		param$data,
     55 		asp=1,
     56 		xlim=c(param$min, param$max),
     57     ylim=c(param$min, param$max),
     58     ...
     59   )
     60   title(ttl, line=-1)
     61 	qqline(param$data, distribution=param$qfunc)
     62 }
     63 
     64 #wave_params <- arma.load_wave_parameters()
     65 #par(pty="s", mfrow=c(3, 3))
     66 #for (name in names(wave_params)) {
     67 #	print(name)
     68 #	arma.qqplot(wave_params[[name]])
     69 #}