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| author | HybridDog <ovvv@web.de> | 2019-03-05 10:11:21 +0100 |
|---|---|---|
| committer | Loïc Blot <nerzhul@users.noreply.github.com> | 2019-03-05 10:11:21 +0100 |
| commit | a7c5dc50e5445c3aa3b45ea4be48fc179bd4cce8 (patch) | |
| tree | 9ece096c4d7c38a3ac9079f8a53c8c9b41b0df30 /builtin/common | |
| parent | 250420e56685b597088596a5498f5babcf6de5f9 (diff) | |
| download | minetest-a7c5dc50e5445c3aa3b45ea4be48fc179bd4cce8.tar.gz minetest-a7c5dc50e5445c3aa3b45ea4be48fc179bd4cce8.tar.bz2 minetest-a7c5dc50e5445c3aa3b45ea4be48fc179bd4cce8.zip | |
Add math.factorial (#8298)
Diffstat (limited to 'builtin/common')
| -rw-r--r-- | builtin/common/misc_helpers.lua | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/builtin/common/misc_helpers.lua b/builtin/common/misc_helpers.lua index e250b0ed1..25632b4ca 100644 --- a/builtin/common/misc_helpers.lua +++ b/builtin/common/misc_helpers.lua @@ -244,6 +244,20 @@ function math.sign(x, tolerance) end -------------------------------------------------------------------------------- +function math.factorial(x) + assert(x % 1 == 0 and x >= 0, "factorial expects a non-negative integer") + if x >= 171 then + -- 171! is greater than the biggest double, no need to calculate + return math.huge + end + local v = 1 + for k = 2, x do + v = v * k + end + return v +end + +-------------------------------------------------------------------------------- function get_last_folder(text,count) local parts = text:split(DIR_DELIM) |