> root [1] 0.0**2 > (double) NaN > root [2] (0.0)**2 > (double) NaN > root [3] pow(0.0,.5) > (double)0.000000000000e+00 > root [4] Which machine / os do you use ? On AIX 4.1 I get : ------------------ root [0] pow(0.0,.5) (double)0.000000000000e+00 root [1] 0.0**2 (double)0.000000000000e+00 root [2] (0.0)**2 (double)0.000000000000e+00 ------------------ On HP-UX 9.1 I get : ------------------ root [0] pow(0.0,.5) (double)0.000000000000e+00 root [1] 0.0**2 log: SING error <-? (double)0.000000000000e+00 root [2] (0.0)**2 log: SING error <-? (double)0.000000000000e+00 ------------------ Jacek.
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