# Qrng

From gsl v2.1-6
0th

Percentile

##### Quasi-random sequences

Quasi-random sequences as per the Gnu Scientific Library, reference manual section 18. These functions are declared in header file gsl_qrng.h

Keywords
distribution, datagen
##### Usage
qrng_alloc(type = c("niederreiter_2", "sobol"), dim)
qrng_clone(q)
qrng_init(q)
qrng_name(q)
qrng_size(q)
qrng_get(q, n = 1)
##### Arguments
type

Type of sequence

dim

Dimension of sequence

q

Generator from qrng_alloc or qrng_clone

n

How many vectors to generate

##### Details

These are wrappers for the quasi-random sequence functions from the GSL http://www.gnu.org/software/gsl with arguments corresponding to those from the library, with a few exceptions. In particular: I have used dim where the GSL uses just d; I have added the n argument to the qrng_get function, so that a single call can generate n vectors; I have not provided R functions corresponding to qrng_free (because R will automatically free the generator when it is garbage collected) or qrng_state or qrng_memcpy (because these don't make sense within R.)

##### Value

qrng_alloc, qrng_clone and qrng_init return an external pointer to the C structure representing the generator. The internals of this structure are not accessible from within R.

qrng_name returns a character vector giving the name of the generator.

qrng_size returns an integer value giving the internal memory usage of the generator.

qrng_get returns a matrix with n rows and dim columns. Each row is a vector in the quasi-random sequence.

##### References

http://www.gnu.org/software/gsl

• Qrng
• qrng
• qrng_alloc
• qrng_clone
• qrng_init
• qrng_name
• qrng_size
• qrng_get
##### Examples
# NOT RUN {
q <- qrng_alloc(dim = 2)
qrng_name(q)
qrng_get(q, 10)
# }

Documentation reproduced from package gsl, version 2.1-6, License: GPL-3

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