# TRiP98 random command

**
random | events / forward() seed1() debug
lecuyer seed2()
prn list
**

### Purpose

Handles internal random number generator,
for use with biological dose computation.
Random numbers are obtained (deterministically)
by two different linear congruential algorithms, `prn`

and L'Ecuyer,
which use one and two seed values, respectively.
### Parameters

**events**-
Sets the number of events to be used for the sampling.
Startup default is 500.
**forward(fw)**-
Winds forward the internal random seed by computing
`<fw>`

random numbers.
**lecuyer**-
Switch a long period random generator (L'Ecuyer) which uses
two seed values.
**prn**-
Switch a short period (2**30) random generator which uses the
algorithm
seed1 = ( seed1 * 32781 ) % (2**32)

This is the startup default.
**seed1(s1)**-
First seed value (for L'Ecuyer) or single seed value (for prn).
May be a decimal integer or a hex value (starting with 0x).
Note that for
`prn`

only odd seeds may be used !
**seed2(s2)**-
Second seed value (for L'Ecuyer).
May be a decimal integer or a hex value (starting with 0x).
**list**-
Lists current random settings.
**debug**-
Debug switch. Lots of output !

### Remark

none
### Examples

random 1000 / seed1(0xB)

Set 1000 events and the first seed value to hexadecimal 'B' (decimal 11)

Last updated:

$Id: trip98cmdrnd.html,v 1.7 2011/03/08 19:02:44 kraemer Exp $

M.Kraemer@gsi.de