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Add math.factorial (#8298)
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@ -243,6 +243,20 @@ function math.sign(x, tolerance)
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return 0
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end
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--------------------------------------------------------------------------------
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function math.factorial(x)
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assert(x % 1 == 0 and x >= 0, "factorial expects a non-negative integer")
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if x >= 171 then
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-- 171! is greater than the biggest double, no need to calculate
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return math.huge
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end
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local v = 1
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for k = 2, x do
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v = v * k
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end
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return v
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end
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--------------------------------------------------------------------------------
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function get_last_folder(text,count)
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local parts = text:split(DIR_DELIM)
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@ -2378,6 +2378,7 @@ Helper functions
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* tolerance: number, default: `0.0`
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* If the absolute value of `x` is within the `tolerance` or `x` is NaN,
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`0` is returned.
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* `math.factorial(x)`: returns the factorial of `x`
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* `string.split(str, separator, include_empty, max_splits, sep_is_pattern)`
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* `separator`: string, default: `","`
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* `include_empty`: boolean, default: `false`
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