Re^2: Curved Random Distribution


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Re^2: Curved Random Distribution

by Roy Johnson (Monsignor)

on Oct 18, 2005 at 17:45 UTC ( [id://501072]=note: print w/replies, xml )

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in reply to Re: Curved Random Distribution
in thread Curved Random Distribution

Technically, that would be peak-shaped rather than bell-shaped. That is characteristic of probability curves generated with 2 random inputs. Consider the probability table for 2 6-sided dice, for example.

The higher the number of random inputs, the more the resulting distribution looks like a bell curve.

Update: Yep, I glossed right over the mention of "triangle"; all I saw was bell and curve.

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Re^3: Curved Random Distribution
by BrowserUk (Patriarch) on Oct 18, 2005 at 20:01 UTC

True, but the OP did mention a "triangular" distribution. For a better approximation of a bell curve he might use this:

sub bRand {
    my( $target, $variance ) = @_;
    my $v = sum map rand() * $variance, 1 .. 4;
    return $target - $variance + ( $v / 2 );
}
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