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authorHybridDog <ovvv@web.de>2019-03-05 10:11:21 +0100
committerLoïc Blot <nerzhul@users.noreply.github.com>2019-03-05 10:11:21 +0100
commita7c5dc50e5445c3aa3b45ea4be48fc179bd4cce8 (patch)
tree9ece096c4d7c38a3ac9079f8a53c8c9b41b0df30 /builtin
parent250420e56685b597088596a5498f5babcf6de5f9 (diff)
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Add math.factorial (#8298)
Diffstat (limited to 'builtin')
-rw-r--r--builtin/common/misc_helpers.lua14
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)