R Under development (unstable) (2023-11-02 r85465 ucrt) -- "Unsuffered Consequences"
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> library(DPQ)
> ### Testing the Fortran / C code
> 
> ###  originally == /u/maechler/R/MM/NUMERICS/dpq-functions/wienergerm-pchisq-tst.R
> 
> Aeq <- function(x,y) all.equal(x,y, tol = 1e-10)
> 
> for (Ftn in c(TRUE,FALSE)) {
+     cat("Fortran =",Ftn, "\n")
+     stopifnot(
+               Aeq(pchisqW.(print(7), df=1, ncp=2, Fort=Ftn)[[1]]$p,
+                   0.890202842),
+               Aeq(pchisqW.(7, df=1, ncp=2, Fort=Ftn, vari=print('f'))[[1]]$p,
+                   0.8908801586),
+         ##
+               Aeq(pchisqW.(print(44), df=4, ncp=16, Fort=Ftn)[[1]]$p,
+                   0.99045176549),
+         ##
+               Aeq(pchisqW.(44, df=4, ncp=16, Fort=Ftn, vari=print('f'))[[1]]$p,
+                   0.9904601514265),
+         ##
+               Aeq(pchisqW.(print(50), df=3.5, ncp=20, Fort=Ftn)[[1]]$p,
+                   0.9912862375384),
+               Aeq(pchisqW.(50, df=3.5,ncp=20, Fort=Ftn, vari=print('f'))[[1]]$p,
+                   0.9912928203989)
+               )
+ }
Fortran = TRUE 
[1] 7
[1] "f"
[1] 44
[1] "f"
[1] 50
[1] "f"
Fortran = FALSE 
[1] 7
[1] "f"
[1] 44
[1] "f"
[1] 50
[1] "f"
> 
> pchisqW(1:3, df=1, ncp=2)
nonc_chi(*, variant=2) -> s = 1 ==> setting variant := 1
[1] 0.3417864 0.4524479 0.6160588
> 
> x1 <- c(1:3,10,50,100,199:205) # problem at  x == 201 = df+ncp  !!!
> p1 <- pchisqW(x1, df=200, ncp=1)
> Aeq(p1,
+     c(3.132799411e-189, 2.4267526025e-159, 6.029138178e-142, 3.7252821178e-91,
+       8.4350675182e-30, 2.4797380646e-10, 0.47350428951, 0.49343195544,
+       1, ## was NaN
+       0.53307133169, 0.55270012044, 0.57213676726, 0.59133736744))
[1] "Mean relative difference: 3.384587e-10"
> ## [1] "Mean relative difference: 3.384587e-10"
> 
> proc.time()
   user  system elapsed 
   0.32    0.04    0.35