nan [was: grftest failure]

[Clint Adams]

> With -O2, t.grftest passes, but make check fails at
> ../../../bogofilter/tests/t.systest.d/outputs/grftest.out
> ./checks.13437.20030105T135330/tests/grftest.out differ: byte 76, line 2

I've modified t.grftest to do a diff -u; here is the output from make
check

--- ../../../bogofilter/tests/t.systest.d/outputs/grftest.out
2003-01-03 12:00:33.000000000 -0500
+++ ./checks.14674.20030105T135836/tests/grftest.out    2003-01-05
13:59:19.000000000 -0500
@@ -1,9 +1,9 @@
 id     graham       robinson     fisher       tristate  
 - 1   S 1.000000   h 0.538130   h 0.500000   u 0.500000
 - 2   S 1.000000   S 0.625327   S 0.990601   S 9.40e-03
 - 3   S 1.000000   S 0.640989   S 0.999983   S 1.72e-05
 - 4   S 1.000000   S 0.694330   S 1.000000   S 1.47e-07
 - 5   S 1.000000   S 0.723848   S 1.000000   S 0.00e+00
 - 6   S 1.000000   S 0.690170   S 1.000000   S 7.75e-12
 - 7   S 1.000000   S 0.745375   S 1.000000   S 0.00e+00
 - 8   S 1.000000   S 0.784853   S 1.000000   S 0.00e+00
 + 1   S 1.000000   S 0.636524   S 1.000000   u 0.500000
 + 2   S 1.000000   S 0.729613   S 1.000000   S 9.40e-03
 + 3   S 1.000000   S 0.694555   S 1.000000   S 1.72e-05
 + 4   S 1.000000   S 0.724639   S 1.000000   S 1.47e-07
 + 5   S 1.000000   S 0.749860   S 1.000000   S 0.00e+00
 + 6   S 1.000000   S 0.730966   S 1.000000   S 7.75e-12
 + 7   S 1.000000   S 0.821210   S 1.000000   S 0.00e+00
 + 8   S 1.000000   S 0.813989   S 1.000000   S 0.00e+00