42 lines
1.4 KiB
Ada
42 lines
1.4 KiB
Ada
function Gamma (X : Long_Float) return Long_Float is
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A : constant array (0..29) of Long_Float :=
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( 1.00000_00000_00000_00000,
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0.57721_56649_01532_86061,
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-0.65587_80715_20253_88108,
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-0.04200_26350_34095_23553,
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0.16653_86113_82291_48950,
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-0.04219_77345_55544_33675,
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-0.00962_19715_27876_97356,
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0.00721_89432_46663_09954,
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-0.00116_51675_91859_06511,
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-0.00021_52416_74114_95097,
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0.00012_80502_82388_11619,
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-0.00002_01348_54780_78824,
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-0.00000_12504_93482_14267,
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0.00000_11330_27231_98170,
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-0.00000_02056_33841_69776,
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0.00000_00061_16095_10448,
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0.00000_00050_02007_64447,
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-0.00000_00011_81274_57049,
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0.00000_00001_04342_67117,
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0.00000_00000_07782_26344,
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-0.00000_00000_03696_80562,
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0.00000_00000_00510_03703,
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-0.00000_00000_00020_58326,
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-0.00000_00000_00005_34812,
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0.00000_00000_00001_22678,
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-0.00000_00000_00000_11813,
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0.00000_00000_00000_00119,
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0.00000_00000_00000_00141,
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-0.00000_00000_00000_00023,
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0.00000_00000_00000_00002
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);
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Y : constant Long_Float := X - 1.0;
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Sum : Long_Float := A (A'Last);
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begin
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for N in reverse A'First..A'Last - 1 loop
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Sum := Sum * Y + A (N);
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end loop;
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return 1.0 / Sum;
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end Gamma;
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