// output of ./demo/arith/briggs-log-demo.cc:
// Description:
//% Computation of the logarithm using a method similar to the shift-and-add algorithm.

arg 1: 1.41421 == x  [Argument for log(x) computation x>=1]  default=1.41421
arg 2: 2 == b  [Base of logarithm: b>0 and b!=1]  default=2
arg 3: 1e-05 == eps  [Precision of the result]  default=1e-05

-1   1.41421356   0.00000000  +0.70710678  +0.00000000
 2   1.41421356   0.00000000  +0.35355339  +0.41503749
 2   1.06066017   0.41503749  +0.26516504  +0.41503749
 3   1.06066017   0.41503749  +0.13258252  +0.19264507
 4   1.06066017   0.41503749  +0.06629126  +0.09310940
 5   1.06066017   0.41503749  +0.03314563  +0.04580368
 5   1.02751454   0.46084118  +0.03210982  +0.04580368
 6   1.02751454   0.46084118  +0.01605491  +0.02272007
 6   1.01145962   0.48356126  +0.01580405  +0.02272007
 7   1.01145962   0.48356126  +0.00790202  +0.01131531
 7   1.00355759   0.49487657  +0.00784029  +0.01131531
 8   1.00355759   0.49487657  +0.00392014  +0.00564656
 9   1.00355759   0.49487657  +0.00196007  +0.00282051
 9   1.00159752   0.49769709  +0.00195624  +0.00282051
10   1.00159752   0.49769709  +0.00097812  +0.00140957
10   1.00061940   0.49910666  +0.00097716  +0.00140957
11   1.00061940   0.49910666  +0.00048858  +0.00070461
11   1.00013081   0.49981128  +0.00048834  +0.00070461
12   1.00013081   0.49981128  +0.00024417  +0.00035226
13   1.00013081   0.49981128  +0.00012208  +0.00017612
13   1.00000873   0.49998740  +0.00012207  +0.00017612

99   1.00000000   0.50000000  +0.00000000  +0.00000000

dl = -1.259810220077817178e-05