systemnoise: Generate system noise

In NeuroStat/neuRosim: Functions to Generate fMRI Data Including Activated Data, Noise Data and Resting State Data

Description

Generates a system noise dataset with specified dimensions and standard deviation. The noise can be either Gaussian or Rician distributed.

Usage

systemnoise(dim, nscan, type=c("gaussian","rician"), sigma, vee, template, 
		verbose = TRUE)

Arguments

dim	A vector specifying the dimensions of the image.
nscan	The number of scans in the dataset.
type	Distribution of system noise. Default is gaussian.
sigma	The standard deviation of the noise.
vee	If type=="rician", the non-centrality parameter of the distribution .
template	An array representing the anatomical structure or mask with dimensions equal to dim.
verbose	Logical indicating if warnings should be printed.

Value

An array containing the noise with dimensions specified in dim and nscan.

Author(s)

M. Welvaert

See Also

temporalnoise, lowfreqdrift, physnoise, tasknoise, spatialnoise

Examples

d <- c(10,10,10)
sigma <- 5
nscan <- 100
out <- systemnoise(d, nscan, type="rician", sigma, verbose=FALSE)

NeuroStat/neuRosim documentation built on Sept. 14, 2019, 10:37 a.m.