sim_x {bliss}

R Documentation

sim_x

Description

Simulate functional covariate observations.

Usage

sim_x(param)

Arguments

param

a list containing : grid a numerical vector, the observation times. n an integer, the sample size. p an integer, the number of observation times. diagVar a numerical vector (optional), the diagonal of the autocorrelation matrix. dim a numerical value (optional), the dimension of the Fourier basis, if "shape" is "Fourier" or "Fourier2". ksi a numerical value (optional) related to the observations correlation. x_shape a character vector (optional), the shape of the observations.

Details

Several shape are available for the observations: "Fourier", "Fourier2", "random_walk", "random_sharp", "uniform", "gaussian", "mvgauss", "mvgauss_different_scale", "mvgauss_different_scale2", "mvgauss_different_scale3" and "mvgauss_different_scale4".

Value

a matrix which contains the functional covariate observations at time points given by grid.

Examples

library(RColorBrewer)
### Fourier
param <- list(n=15,p=100,grid=seq(0,1,length=100),x_shape="Fourier")
x <- sim_x(param)
cols <- colorRampPalette(brewer.pal(9,"YlOrRd"))(15)
matplot(param$grid,t(x),type="l",lty=1,col=cols)
### Fourier2
param <- list(n=15,p=100,grid=seq(0,1,length=100),x_type="Fourier2")
x <- sim_x(param)
cols <- colorRampPalette(brewer.pal(9,"YlOrRd"))(15)
matplot(param$grid,t(x),type="l",lty=1,col=cols)
### random_walk
param <- list(n=15,p=100,grid=seq(0,1,length=100),x_type="random_walk")
x <- sim_x(param)
cols <- colorRampPalette(brewer.pal(9,"YlOrRd"))(15)
matplot(param$grid,t(x),type="l",lty=1,col=cols)
### random_sharp
param <- list(n=15,p=100,grid=seq(0,1,length=100),x_type="random_sharp")
x <- sim_x(param)
cols <- colorRampPalette(brewer.pal(9,"YlOrRd"))(15)
matplot(param$grid,t(x),type="l",lty=1,col=cols)
### uniform
param <- list(n=15,p=100,grid=seq(0,1,length=100),x_type="uniform")
x <- sim_x(param)
cols <- colorRampPalette(brewer.pal(9,"YlOrRd"))(15)
matplot(param$grid,t(x),type="l",lty=1,col=cols)
### gaussian
param <- list(n=15,p=100,grid=seq(0,1,length=100),x_type="gaussian")
x <- sim_x(param)
cols <- colorRampPalette(brewer.pal(9,"YlOrRd"))(15)
matplot(param$grid,t(x),type="l",lty=1,col=cols)
### mvgauss
param <- list(n=15,p=100,grid=seq(0,1,length=100),x_type="mvgauss")
x <- sim_x(param)
cols <- colorRampPalette(brewer.pal(9,"YlOrRd"))(15)
matplot(param$grid,t(x),type="l",lty=1,col=cols)

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