RandomChisqArray-class {DelayedRandomArray} | R Documentation |
A DelayedArray subclass that performs on-the-fly sampling of chi-squared-distributed values.
RandomChisqArraySeed(dim, df, ncp = 0, chunkdim = NULL) ## S4 method for signature 'RandomChisqArraySeed' DelayedArray(seed) RandomChisqArray(dim, df, ncp = 0, chunkdim = NULL)
dim |
Integer vector of positive length, specifying the dimensions of the array. |
df, ncp |
Numeric vector used as the argument of the same name in |
chunkdim |
Integer vector of length equal to |
seed |
A RandomChisqArraySeed object. |
All constructors return an instance of a RandomChisqArray object, containing random draws from a chi-squared distribution with the specified parameters.
Aaron Lun
The RandomArraySeed class, for details on chunking and the distributional parameters.
X <- RandomChisqArraySeed(c(1e5, 1e5), df=5) Y <- DelayedArray(X) Y # Fiddling with the distribution parameters: X2 <- RandomChisqArraySeed(c(1e5, 1e5), df=runif(1e5)*20) Y2 <- DelayedArray(X2) Y2 # Using another array as input: library(Matrix) df <- rsparsematrix(1e5, 1e5, density=0.00001) df <- abs(DelayedArray(df) + 1) * 10 X3 <- RandomChisqArraySeed(c(1e5, 1e5), df=df) Y3 <- DelayedArray(X3) Y3