pub unsafe fn Rf_qchisq(p: f64, df: f64, lower_tail: c_int, log_p: c_int) -> f64Expand description
Chi-squared quantile function:
qchisq(p, df, lower.tail = lower_tail, log.p = log_p) (central only;
stats::qchisq with ncp calls a different routine).
Rf_qchisq from Rmath.h (the qchisq macro resolves to it). It is
R’s gamma quantile with shape df / 2 and scale 2. The flags have
the same meaning as for Rf_qnorm5.
§R conditions
A p outside the probability range or a negative df returns NaN
without a warning (nmath does not report domain errors). The gamma
quantile iterates, and nmath reports non-convergence or precision
loss in it (and in the gamma distribution function it calls) through
R’s warning(); under options(warn = 2) that warning becomes an R
error, which longjmps. Call this where such a longjmp is caught: a
#[miniextendr] function body, or
with_r_unwind_protect.
#[r_ffi_checked] gives thread routing and checking only, not an
unwind guard.
Checked wrapper for Rf_qchisq. Calls Rf_qchisq_unchecked and routes through with_r_thread.
Generated from source location line 1779, column 12.
Generated from source file miniextendr-api/src/sys.rs.