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[/] [rng_lib/] [trunk/] [bench/] [vhdl/] [rng_lib.vhd] - Diff between revs 8 and 11
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| Rev 8 |
Rev 11 |
| Line 153... |
Line 153... |
rnd_out := rng(rnd_out);
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rnd_out := rng(rnd_out);
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y := -1.0 + 2.0 * rnd_out.rnd;
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y := -1.0 + 2.0 * rnd_out.rnd;
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z := (x * x) + (y * y);
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z := (x * x) + (y * y);
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end loop;
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end loop;
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-- Box-Mueller transform
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-- Box-Mueller transform
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rnd_out.rnd := rnd_out.y + rnd_out.z * y * sqrt(-2.0 * log(z)/z);
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rnd_out.rnd := rnd_out.y + rnd_out.z * y * sqrt(-2.0 * ln(z)/z);
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-- Exponential distribution
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-- Exponential distribution
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when EXPONENTIAL =>
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when EXPONENTIAL =>
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rnd_out := rng(rnd);
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rnd_out := rng(rnd);
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rnd_out.rnd := -rnd_out.y * log(1.0 - rnd_out.rnd);
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rnd_out.rnd := -rnd_out.y * log(1.0 - rnd_out.rnd);
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when others =>
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when others =>
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