nag_rand_chi_sq (g05sdc) generates a vector of pseudorandom numbers taken from a ${\chi}^{2}$-distribution with $\nu $ degrees of freedom.
The distribution has PDF (probability density function)
This is the same as a gamma distribution with parameters
$\nu /2$ and
$2$.
One of the initialization functions
nag_rand_init_repeatable (g05kfc) (for a repeatable sequence if computed sequentially) or
nag_rand_init_nonrepeatable (g05kgc) (for a non-repeatable sequence) must be called prior to the first call to nag_rand_chi_sq (g05sdc).
Not applicable.
nag_rand_chi_sq (g05sdc) is threaded by NAG for parallel execution in multithreaded implementations of the NAG Library.
Please consult the
x06 Chapter Introduction for information on how to control and interrogate the OpenMP environment used within this function. Please also consult the
Users' Note for your implementation for any additional implementation-specific information.
This example prints five pseudorandom numbers from a
${\chi}^{2}$-distribution with five degrees of freedom, generated by a single call to nag_rand_chi_sq (g05sdc), after initialization by
nag_rand_init_repeatable (g05kfc).
None.