[R] R-1.7.0 'make check' fails on reg-tests-1

[Prof Brian Ripley]

You appear to have a problem with the accuracy of the arithmetic on that
machine. Please run the test by hand and tell us what N and max(dd) are
when the test fails (or is it the mvftt test?)

The test is not new, but the change in random-number generator will affect 
what values are tested.

On Tue, 20 May 2003, James F. Reid wrote:

> Dear all,
> 
> I am trying to upgrade R-1.6.2 to R-1.7.0 on an SGI running IRIX6.5.
> 
> Everything compiles but I get an error in the testing phase:
> 
> [snip]
> running regression tests
> make[3]: Entering directory `/usr/local/src/R-1.7.0/tests'
> running code in 'reg-tests-1.R' ...make[3]: *** [reg-tests-1.Rout] Error 1
> make[3]: Leaving directory `/usr/local/src/R-1.7.0/tests'
> make[2]: *** [test-Reg] Error 2
> make[2]: Leaving directory `/usr/local/src/R-1.7.0/tests'
> make[1]: *** [test-all-basics] Error 1
> make[1]: Leaving directory `/usr/local/src/R-1.7.0/tests'
> make: *** [check] Error 2
> 
> this is the part in reg-tests-1.Rout.fail which fails:
> 
>  > ## fft
>  > set.seed(123)
>  > eps <- 1e-11
>  > for(N in 1:130) {
> +     x <- rnorm(N)
> +     if(N %% 5 == 0) {
> +       m5 <- matrix(x,ncol=5)
> +       stopifnot(apply(m5,2,fft) == mvfft(m5))
> +     }
> +     dd <- Mod(1 - (f2 <- fft(fft(x), inverse=TRUE)/(x*length(x))))
> +     stopifnot(dd < eps)
> + }
> 
> 
> Any help concerning this matter would be very much appreciated.
> 
> Best regards,
> James Reid.
> 
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> 

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595