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MUSHclient scripting

Description of MUSHclient world function: world.MtSrand


Name MtSrand
Type Method
Summary Seed the Mersenne Twister pseudo-random number generator
Prototype void MtSrand(long Seed);

View list of data type meanings

Description

This seeds the MT generator with the given number, which is a 32-bit number.


Note: Available in version 3.57 onwards.


VBscript example
MtSrand 12345
Jscript example
MtSrand (12345)
Lua example
MtSrand (12345)

MtSrand { 88, 44, 95, 1234, 82343, 44853454 } -- see remarks below
Lua notes
You can also seed the Mersenne Twister with a table of seeds, rather than a single number. 

This is because, although the MT generator has a period of 2^19937-1 (that is, the number of iterations before it repeats itself), the initial seeding is only a single number of 2^32 bits. 

Thus there are effectively only 2^32 (4294967296) possible starting states for the generator. 

However by initialising with an array of seeds you can effectively seed the generator to many different states.

The restrictions on using the array of seeds are:

* It only applies to Lua
* The seeds must be numbers (or convertible to numbers)
* There must be at least one number
* They must be an ordinary Lua vector-style table. That is, the key of the first seed is 1, the key of the second is 2, and so on.
* The seed numbers should be integers in the range 0 to 4294967296

Example:

t = { 1234, 5678, 9876, 5432 }
MtSrand (t) -- seed with table of seeds
MtSrand (8888) -- seed with single seed

The MT internal state consists of a vector of 624 32-bit numbers. 

You can supply any size table, if it is less than 624 entries, effectively the ones you supply are repeated through the state table. 

If you supply more they will be XOR'd with the earlier values. Probably 624 numbers is the maximum useful amount you can supply.
Returns Nothing.
Introduced in version 3.57

See also ...

Function Description
MtRand Returns pseudo-random number using the Mersenne Twister algorithm

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