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randnumb.c, update comments

This commit is contained in:
h_vogt 2017-02-25 14:22:15 +01:00 committed by rlar
parent cf31495471
commit 1e41b92cd0
1 changed files with 7 additions and 10 deletions
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17
src/maths/misc/randnumb.c
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@ -1,12 +1,12 @@
/**********
Copyright 2008 Holger Vogt
Copyright 2008, 2017 Holger Vogt
**********/
/* Care about random numbers
The seed value is obtained from getpid() in main.c upon start-up
The seed value is set to 1 in main.c upon start-up
and stored in a variable named 'rndseed'.
A fixed seed value may be set by 'set rndseed=value' in .spiceinit
or interactively. This value then is acknowledged by the next call
to checkseed().
or interactively. This value then is then used as seed after
a call to 'setseed'.
*/
@ -74,11 +74,8 @@ static bool seedinfo = FALSE;
/* Check if a seed has been set by the command 'set rndseed=value'
in spinit, .spiceinit or in a .control section
with integer value > 0. If available, call srand(value).
rndseed set in main.c to getpid will be used, if no 'set rndseed=val' is given.
Checkseed should be put in front of any call to rand or CombLCGTaus
to catch any change of rndseed.
Checkseed may not be used to reset the random number generator, if
rndseed has not been changed.
rndseed set in main.c to 1, if no 'set rndseed=val' is given.
Called from functions in cmath2.c.
*/
void checkseed(void)
{
@ -292,7 +289,7 @@ double exprand(double mean)
/* seed random number generators immediately
* command "setseed"
* take value of variable rndseed as seed
* command "setcirc <n>"
* command "setseed <n>"
* seed with number <n>
*/
void