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.gitattributes

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+# Auto detect text files and perform LF normalization
+* text=auto

LICENSE.txt

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+LuaMatrix License
+-----------
+
+LuaMatrix ( http://luamatrix.luaforge.net/ ) is licensed under the
+same terms as Lua (MIT license) reproduced below.  This means that
+LuaMatrix is free software and can be used for both academic and
+commercial purposes at absolutely no cost.
+
+For details and rationale, see http://www.lua.org/license.html .
+
+===============================================================================
+
+Copyright (C) 2007-2010 Michael Lutz.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+
+===============================================================================
+
+(end of COPYRIGHT)

README.txt

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+https://github.com/entuland/lua-complex is just a thin wrapper to make this library available as a mod inside the Minetest game.
+Please see https://github.com/davidm/lua-matrix for the original version

complex.lua

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+--[[
+ 
+LUA MODULE
+ 
+   complex v$(_VERSION) - complex numbers implemented as Lua tables
+ 
+SYNOPSIS
+
+  local complex = require 'complex'
+  local cx1 = complex "2+3i" -- or complex.new(2, 3) 
+  local cx2 = complex "3+2i"
+  assert( complex.add(cx1,cx2) == complex "5+5i" )
+  assert( tostring(cx1) == "2+3i" )
+ 
+DESCRIPTION
+ 
+  'complex' provides common tasks with complex numbers
+
+   function complex.to( arg ); complex( arg )
+   returns a complex number on success, nil on failure
+   arg := number or { number,number } or ( "(-)<number>" and/or "(+/-)<number>i" )
+      e.g. 5; {2,3}; "2", "2+i", "-2i", "2^2*3+1/3i"
+      note: 'i' is always in the numerator, spaces are not allowed
+
+  A complex number is defined as Cartesian complex number
+  complex number := { real_part, imaginary_part } .
+  This gives fast access to both parts of the number for calculation.
+  The access is faster than in a hash table
+  The metatable is just an add on.  When it comes to speed, one is faster using a direct function call.
+
+API
+
+  See code and test_complex.lua.
+
+DEPENDENCIES
+
+  None (other than Lua 5.1 or 5.2).
+  
+HOME PAGE
+  
+  http://luamatrix.luaforge.net
+  http://lua-users.org/wiki/LuaMatrix
+
+DOWNLOAD/INSTALL
+
+  ./util.mk
+  cd tmp/*
+  luarocks make
+  
+ Licensed under the same terms as Lua itself.
+ 
+  Developers:
+    Michael Lutz (chillcode)
+    David Manura http://lua-users.org/wiki/DavidManura (maintainer)
+--]]
+
+--/////////////--
+--// complex //--
+--/////////////--
+
+-- link to complex table
+local complex = {_TYPE='module', _NAME='complex', _VERSION='0.3.3.20111212'}
+
+-- link to complex metatable
+local complex_meta = {}
+
+-- helper functions for parsing complex number strings.
+local function parse_scalar(s, pos0)
+	local x, n, pos = s:match('^([+-]?[%d%.]+)(.?)()', pos0)
+	if not x then return end
+	if n == 'e' or n == 'E' then
+		local x2, n2, pos2 = s:match('^([+-]?%d+)(.?)()', pos)
+		if not x2 then error 'number format error' end
+		x = tonumber(x..n..x2)
+		if not x then error 'number format error' end
+		return x, n2, pos2
+	else
+		x = tonumber(x)
+		if not x then error 'number format error' end
+		return x, n, pos
+	end
+end
+local function parse_component(s, pos0)
+	local x, n, pos = parse_scalar(s, pos0)
+	if not x then
+		local x2, n2, pos2 = s:match('^([+-]?)(i)()$', pos0)
+		if not x2 then error 'number format error' end
+		return (x2=='-' and -1 or 1), n2, pos2
+	end
+	if n == '/' then
+		local x2, n2, pos2 = parse_scalar(s, pos)
+		x = x / x2
+		return x, n2, pos2
+	end
+	return x, n, pos
+end
+local function parse_complex(s)
+	local x, n, pos = parse_component(s, 1)
+	if n == '+' or n == '-' then
+		local x2, n2, pos2 = parse_component(s, pos)
+		if n2 ~= 'i' or pos2 ~= #s+1 then error 'number format error' end
+		if n == '-' then x2 = - x2 end
+		return x, x2
+	elseif n == '' then
+		return x, 0
+	elseif n == 'i' then
+		if pos ~= #s+1 then error 'number format error' end
+		return 0, x
+	else
+		error 'number format error'
+	end
+end
+
+-- complex.to( arg )
+-- return a complex number on success
+-- return nil on failure
+function complex.to( num )
+	-- check for table type
+	if type( num ) == "table" then
+		-- check for a complex number
+		if getmetatable( num ) == complex_meta then
+			return num
+		end
+		local real,imag = tonumber( num[1] ),tonumber( num[2] )
+		if real and imag then
+			return setmetatable( { real,imag }, complex_meta )
+		end
+		return
+	end
+	-- check for number
+	local isnum = tonumber( num )
+	if isnum then
+		return setmetatable( { isnum,0 }, complex_meta )
+	end
+	if type( num ) == "string" then
+		local real, imag = parse_complex(num)
+		return setmetatable( { real, imag }, complex_meta )
+	end
+end
+
+-- complex( arg )
+-- same as complex.to( arg )
+-- set __call behaviour of complex
+setmetatable( complex, { __call = function( _,num ) return complex.to( num ) end } )
+
+-- complex.new( real, complex )
+-- fast function to get a complex number, not invoking any checks
+function complex.new( ... )
+	return setmetatable( { ... }, complex_meta )
+end
+
+-- complex.type( arg )
+-- is argument of type complex
+function complex.type( arg )
+	if getmetatable( arg ) == complex_meta then
+		return "complex"
+	end
+end
+
+-- complex.convpolar( r, phi )
+-- convert polar coordinates ( r*e^(i*phi) ) to carthesic complex number
+-- r (radius) is a number
+-- phi (angle) must be in radians; e.g. [0 - 2pi]
+function complex.convpolar( radius, phi )
+	return setmetatable( { radius * math.cos( phi ), radius * math.sin( phi ) }, complex_meta )
+end
+
+-- complex.convpolardeg( r, phi )
+-- convert polar coordinates ( r*e^(i*phi) ) to carthesic complex number
+-- r (radius) is a number
+-- phi must be in degrees; e.g. [0 - 360 deg]
+function complex.convpolardeg( radius, phi )
+	phi = phi/180 * math.pi
+	return setmetatable( { radius * math.cos( phi ), radius * math.sin( phi ) }, complex_meta )
+end
+
+--// complex number functions only
+
+-- complex.tostring( cx [, formatstr] )
+-- to string or real number
+-- takes a complex number and returns its string value or real number value
+function complex.tostring( cx,formatstr )
+	local real,imag = cx[1],cx[2]
+	if formatstr then
+		if imag == 0 then
+			return string.format( formatstr, real )
+		elseif real == 0 then
+			return string.format( formatstr, imag ).."i"
+		elseif imag > 0 then
+			return string.format( formatstr, real ).."+"..string.format( formatstr, imag ).."i"
+		end
+		return string.format( formatstr, real )..string.format( formatstr, imag ).."i"
+	end
+	if imag == 0 then
+		return real
+	elseif real == 0 then
+		return ((imag==1 and "") or (imag==-1 and "-") or imag).."i"
+	elseif imag > 0 then
+		return real.."+"..(imag==1 and "" or imag).."i"
+	end
+	return real..(imag==-1 and "-" or imag).."i"
+end
+
+-- complex.print( cx [, formatstr] )
+-- print a complex number
+function complex.print( ... )
+	print( complex.tostring( ... ) )
+end
+
+-- complex.polar( cx )
+-- from complex number to polar coordinates
+-- output in radians; [-pi,+pi]
+-- returns r (radius), phi (angle)
+function complex.polar( cx )
+	return math.sqrt( cx[1]^2 + cx[2]^2 ), math.atan2( cx[2], cx[1] )
+end
+
+-- complex.polardeg( cx )
+-- from complex number to polar coordinates
+-- output in degrees; [-180, 180 deg]
+-- returns r (radius), phi (angle)
+function complex.polardeg( cx )
+	return math.sqrt( cx[1]^2 + cx[2]^2 ), math.atan2( cx[2], cx[1] ) / math.pi * 180
+end
+
+-- complex.norm2( cx )
+-- multiply with conjugate, function returning a scalar number
+-- norm2(x + i*y) returns x^2 + y^2
+function complex.norm2( cx )
+	return cx[1]^2 + cx[2]^2
+end
+
+-- complex.abs( cx )
+-- get the absolute value of a complex number
+function complex.abs( cx )
+	return math.sqrt( cx[1]^2 + cx[2]^2 )
+end
+
+-- complex.get( cx )
+-- returns real_part, imaginary_part
+function complex.get( cx )
+	return cx[1],cx[2]
+end
+
+-- complex.set( cx, real, imag )
+-- sets real_part = real and imaginary_part = imag
+function complex.set( cx,real,imag )
+	cx[1],cx[2] = real,imag
+end
+
+-- complex.is( cx, real, imag )
+-- returns true if, real_part = real and imaginary_part = imag
+-- else returns false
+function complex.is( cx,real,imag )
+	if cx[1] == real and cx[2] == imag then
+		return true
+	end
+	return false
+end
+
+--// functions returning a new complex number
+
+-- complex.copy( cx )
+-- copy complex number
+function complex.copy( cx )
+	return setmetatable( { cx[1],cx[2] }, complex_meta )
+end
+
+-- complex.add( cx1, cx2 )
+-- add two numbers; cx1 + cx2
+function complex.add( cx1,cx2 )
+	return setmetatable( { cx1[1]+cx2[1], cx1[2]+cx2[2] }, complex_meta )
+end
+
+-- complex.sub( cx1, cx2 )
+-- subtract two numbers; cx1 - cx2
+function complex.sub( cx1,cx2 )
+	return setmetatable( { cx1[1]-cx2[1], cx1[2]-cx2[2] }, complex_meta )
+end
+
+-- complex.mul( cx1, cx2 )
+-- multiply two numbers; cx1 * cx2
+function complex.mul( cx1,cx2 )
+	return setmetatable( { cx1[1]*cx2[1] - cx1[2]*cx2[2],cx1[1]*cx2[2] + cx1[2]*cx2[1] }, complex_meta )
+end
+
+-- complex.mulnum( cx, num )
+-- multiply complex with number; cx1 * num
+function complex.mulnum( cx,num )
+	return setmetatable( { cx[1]*num,cx[2]*num }, complex_meta )
+end
+
+-- complex.div( cx1, cx2 )
+-- divide 2 numbers; cx1 / cx2
+function complex.div( cx1,cx2 )
+	-- get complex value
+	local val = cx2[1]^2 + cx2[2]^2
+	-- multiply cx1 with conjugate complex of cx2 and divide through val
+	return setmetatable( { (cx1[1]*cx2[1]+cx1[2]*cx2[2])/val,(cx1[2]*cx2[1]-cx1[1]*cx2[2])/val }, complex_meta )
+end
+
+-- complex.divnum( cx, num )
+-- divide through a number
+function complex.divnum( cx,num )
+	return setmetatable( { cx[1]/num,cx[2]/num }, complex_meta )
+end
+
+-- complex.pow( cx, num )
+-- get the power of a complex number
+function complex.pow( cx,num )
+	if math.floor( num ) == num then
+		if num < 0 then
+			local val = cx[1]^2 + cx[2]^2
+			cx = { cx[1]/val,-cx[2]/val }
+			num = -num
+		end
+		local real,imag = cx[1],cx[2]
+		for i = 2,num do
+			real,imag = real*cx[1] - imag*cx[2],real*cx[2] + imag*cx[1]
+		end
+		return setmetatable( { real,imag }, complex_meta )
+	end
+	-- we calculate the polar complex number now
+	-- since then we have the versatility to calc any potenz of the complex number
+	-- then we convert it back to a carthesic complex number, we loose precision here
+	local length,phi = math.sqrt( cx[1]^2 + cx[2]^2 )^num, math.atan2( cx[2], cx[1] )*num
+	return setmetatable( { length * math.cos( phi ), length * math.sin( phi ) }, complex_meta )
+end
+
+-- complex.sqrt( cx )
+-- get the first squareroot of a complex number, more accurate than cx^.5
+function complex.sqrt( cx )
+	local len = math.sqrt( cx[1]^2+cx[2]^2 )
+	local sign = (cx[2]<0 and -1) or 1
+	return setmetatable( { math.sqrt((cx[1]+len)/2), sign*math.sqrt((len-cx[1])/2) }, complex_meta )
+end
+
+-- complex.ln( cx )
+-- natural logarithm of cx
+function complex.ln( cx )
+	return setmetatable( { math.log(math.sqrt( cx[1]^2 + cx[2]^2 )),
+		math.atan2( cx[2], cx[1] ) }, complex_meta )
+end
+
+-- complex.exp( cx )
+-- exponent of cx (e^cx)
+function complex.exp( cx )
+	local expreal = math.exp(cx[1])
+	return setmetatable( { expreal*math.cos(cx[2]), expreal*math.sin(cx[2]) }, complex_meta )
+end
+
+-- complex.conjugate( cx )
+-- get conjugate complex of number
+function complex.conjugate( cx )
+	return setmetatable( { cx[1], -cx[2] }, complex_meta )
+end
+
+-- complex.round( cx [,idp] )
+-- round complex numbers, by default to 0 decimal points
+function complex.round( cx,idp )
+	local mult = 10^( idp or 0 )
+	return setmetatable( { math.floor( cx[1] * mult + 0.5 ) / mult,
+		math.floor( cx[2] * mult + 0.5 ) / mult }, complex_meta )
+end
+
+--// variables
+complex.zero = complex.new(0, 0)
+complex.one  = complex.new(1, 0)
+
+--// metatable functions
+
+complex_meta.__add = function( cx1,cx2 )
+	local cx1,cx2 = complex.to( cx1 ),complex.to( cx2 )
+	return complex.add( cx1,cx2 )
+end
+complex_meta.__sub = function( cx1,cx2 )
+	local cx1,cx2 = complex.to( cx1 ),complex.to( cx2 )
+	return complex.sub( cx1,cx2 )
+end
+complex_meta.__mul = function( cx1,cx2 )
+	local cx1,cx2 = complex.to( cx1 ),complex.to( cx2 )
+	return complex.mul( cx1,cx2 )
+end
+complex_meta.__div = function( cx1,cx2 )
+	local cx1,cx2 = complex.to( cx1 ),complex.to( cx2 )
+	return complex.div( cx1,cx2 )
+end
+complex_meta.__pow = function( cx,num )
+	if num == "*" then
+		return complex.conjugate( cx )
+	end
+	return complex.pow( cx,num )
+end
+complex_meta.__unm = function( cx )
+	return setmetatable( { -cx[1], -cx[2] }, complex_meta )
+end
+complex_meta.__eq = function( cx1,cx2 )
+	if cx1[1] == cx2[1] and cx1[2] == cx2[2] then
+		return true
+	end
+	return false
+end
+complex_meta.__tostring = function( cx )
+	return tostring( complex.tostring( cx ) )
+end
+complex_meta.__concat = function( cx,cx2 )
+	return tostring(cx)..tostring(cx2)
+end
+-- cx( cx, formatstr )
+complex_meta.__call = function( ... )
+	print( complex.tostring( ... ) )
+end
+complex_meta.__index = {}
+for k,v in pairs( complex ) do
+	complex_meta.__index[k] = v
+end
+
+return complex
+
+--///////////////--
+--// chillcode //--
+--///////////////--

init.lua

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+
+-- this whole mod is just a thin wrapper around https://github.com/davidm/lua-matrix
+
+local mod_path = minetest.get_modpath(minetest.get_current_modname())
+
+complex = dofile(mod_path .. "/complex.lua")
+
+-- that's it

mod.conf

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+name = complex