Created
January 26, 2024 00:08
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Lua script to calculate how many times you'd need to breed horses in Minecraft to get to at least a target speed
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| if #arg < 1 then | |
| print 'usage: <your command> target [speed1] [speed2]' | |
| print 'units are in m/s.' | |
| print 'if the parents are missing, they\'re assumed to be average of 9.4m/s.' | |
| os.exit(1) | |
| end | |
| --- The number of simulation runs. | |
| local tries = tonumber(os.getenv("TRIES")) or 1000 | |
| --- Format: one value (number of breeds needed to get to target speed) per line | |
| local export = os.getenv("HORSE_SCRIPT_EXPORT") == "YES" | |
| local FACTOR = 42.157796 | |
| --- average: 9.4855041 | |
| local MAX = 0.3375 | |
| local MIN = 0.1125 | |
| local targetSpeed = tonumber(arg[1]) | |
| if not targetSpeed then | |
| print 'missing target speed!' | |
| os.exit(1) | |
| end | |
| targetSpeed = targetSpeed / FACTOR | |
| if targetSpeed > MAX then | |
| print 'target speed too fast!' | |
| print('you\'re asking for '..(targetSpeed*FACTOR)..' m/s but the fastest is '..(MAX*FACTOR)..' m/s!!') | |
| os.exit(1) | |
| elseif targetSpeed < MIN then | |
| print 'target speed too slow!' | |
| print('you\'re asking for '..(targetSpeed*FACTOR)..' m/s but the slowest is '..(MIN*FACTOR)..' m/s!!') | |
| os.exit(1) | |
| end | |
| local parent1 = tonumber(arg[2]) | |
| if not parent1 then | |
| parent1 = 0.225 | |
| else | |
| parent1 = parent1 / FACTOR | |
| end | |
| local parent2 = tonumber(arg[3]) | |
| if not parent2 then | |
| parent2 = 0.225 | |
| else | |
| parent2 = parent2 / FACTOR | |
| end | |
| if targetSpeed < parent1 and targetSpeed < parent2 then | |
| print 'slower target speeds are not supported.' | |
| print 'i don\'t judge you, but this tool doesn\'t support arbitrary targets.' | |
| print 'it\'s desgned to reach the target speed or greater.' | |
| os.exit(1) | |
| end | |
| local mix = function(s1, s2) | |
| local avg = (s1 + s2) * 0.5 | |
| local extra = (MAX - MIN) * 0.15 | |
| local min = math.min(s1, s2) - extra | |
| local max = math.max(s1, s2) + extra | |
| local range = max - min | |
| local i = (math.random() + math.random() + math.random()) / 3 - 0.5 | |
| local s3 = avg + range * i | |
| if s3 > MAX then | |
| local diff = s3 - MAX | |
| s3 = MAX - diff | |
| elseif s3 < MIN then | |
| local diff = MIN - s3 | |
| s3 = MIN + diff | |
| end | |
| return s3 | |
| end | |
| local runUntilTarget = function() | |
| local i = 0 | |
| local parent1 = parent1 | |
| local parent2 = parent2 | |
| repeat | |
| local baby = mix(parent1, parent2) | |
| if baby > parent1 or baby > parent2 then | |
| if parent1 > parent2 and baby > parent2 then | |
| parent2 = baby | |
| elseif baby > parent1 then | |
| parent1 = baby | |
| end | |
| end | |
| i = i + 1 | |
| until baby >= targetSpeed | |
| return i | |
| end | |
| --- Start of Program --- | |
| print('Parents: ['..(parent1 * FACTOR)..', '..(parent2 * FACTOR)..'], Target: >='..(targetSpeed * FACTOR)..', Tries: '..tries) | |
| math.randomseed(os.time()) | |
| local avg = 0 | |
| local data = {} | |
| local fastest = 1/0 | |
| local slowest = -1/0 | |
| for i = 1, tries do | |
| -- io.write('\x1b[2K\rIterating... '..string.format("%.2f%%", (i*100) / tries)):flush() | |
| local x = runUntilTarget() | |
| if x > slowest then | |
| slowest = x | |
| end | |
| if x < fastest then | |
| fastest = x | |
| end | |
| avg = avg + (x / tries) | |
| data[#data+1] = x | |
| end | |
| -- io.write('\x1b[2K\r') | |
| table.sort(data) | |
| local low10 = data[math.ceil(#data/10)] | |
| local top10 = data[#data - math.ceil(#data/10)] | |
| local top20 = data[#data - math.ceil(#data/5)] | |
| print('Average: '..avg..' breeds') | |
| print('Low 10%: '..low10..' breeds') | |
| print('Top 10%: '..top10..' breeds') | |
| print('Top 20%: '..top20..' breeds') | |
| print('Fastest: '..fastest..' breeds') | |
| print('Slowest: '..slowest..' breeds') | |
| if export then | |
| local f, err = io.open('horse_script_export.txt', 'w') | |
| if not f or err ~= nil then | |
| print 'could not export data!' | |
| print(err) | |
| os.exit(1) | |
| end | |
| for _, x in ipairs(data) do | |
| local _, err = f:write(tostring(x)..'\n') | |
| if err ~= nil then | |
| print 'could not write the export file!' | |
| print (err) | |
| f:close() | |
| os.exit(1) | |
| end | |
| end | |
| f:close() | |
| print 'Exported data!' | |
| end |
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