mirror of
https://github.com/lcn2/calc.git
synced 2025-08-16 01:03:29 +03:00
a31078bbec
Some folks might think: “you still use RCS”?!? And we will say, hey, at least we switched from SCCS to RCS back in … I think it was around 1994 ... at least we are keeping up! :-) :-) :-) Logs say that SCCS version 18 became RCS version 19 on 1994 March 18. RCS served us well. But now it is time to move on. And so we are switching to git. Calc releases produce a lot of file changes. In the 125 releases of calc since 1996, when I started managing calc releases, there have been 15473 file mods!
109 lines
2.9 KiB
Plaintext
109 lines
2.9 KiB
Plaintext
/*
|
|
* lnseries - special functions (e.g.: gamma, zeta, psi)
|
|
*
|
|
* Copyright (C) 2013 Christoph Zurnieden
|
|
*
|
|
* Calc is open software; you can redistribute it and/or modify it under
|
|
* the terms of the version 2.1 of the GNU Lesser General Public License
|
|
* as published by the Free Software Foundation.
|
|
*
|
|
* Calc is distributed in the hope that it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
|
|
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
|
|
* Public License for more details.
|
|
*
|
|
* A copy of version 2.1 of the GNU Lesser General Public License is
|
|
* distributed with calc under the filename COPYING-LGPL. You should have
|
|
* received a copy with calc; if not, write to Free Software Foundation, Inc.
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
*
|
|
* Under source code control: 2013/08/11 01:31:28
|
|
* File existed as early as: 2013
|
|
*/
|
|
|
|
|
|
/*
|
|
* hide internal function from resource debugging
|
|
*/
|
|
static resource_debug_level;
|
|
resource_debug_level = config("resource_debug", 0);
|
|
|
|
|
|
static __CZ__int_logs;
|
|
static __CZ__int_logs_limit;
|
|
static __CZ__int_logs_prec;
|
|
|
|
|
|
define deletelnseries(){
|
|
free(__CZ__int_logs,__CZ__int_logs_limit,__CZ__int_logs_prec);
|
|
}
|
|
|
|
define lnfromseries(n){
|
|
if( isnull(__CZ__int_logs)
|
|
|| __CZ__int_logs_limit < n
|
|
|| __CZ__int_logs_prec < log(1/epsilon())){
|
|
|
|
lnseries(n+1);
|
|
}
|
|
return __CZ__int_logs[n,0];
|
|
}
|
|
|
|
define lnseries(limit){
|
|
local k j eps ;
|
|
if( isnull(__CZ__int_logs)
|
|
|| __CZ__int_logs_limit < limit
|
|
|| __CZ__int_logs_prec < log(1/epsilon())){
|
|
__CZ__int_logs = mat[limit+1,2];
|
|
__CZ__int_logs_limit = limit;
|
|
__CZ__int_logs_prec = log(1/epsilon());
|
|
|
|
/* probably still too much */
|
|
eps = epsilon(epsilon()*10^(-(5+log(limit))));
|
|
k =2;
|
|
while(1){
|
|
/* the prime itself, compute logarithm */
|
|
__CZ__int_logs[k,0] = ln(k);
|
|
__CZ__int_logs[k,1] = k;
|
|
|
|
for(j = 2*k;j<=limit;j+=k){
|
|
/* multiples of prime k, add logarithm of k computed earlier */
|
|
__CZ__int_logs[j,0] += __CZ__int_logs[k,0];
|
|
/* First hit, set counter to number */
|
|
if(__CZ__int_logs[j,1] ==0)
|
|
__CZ__int_logs[j,1]=j;
|
|
/* reduce counter by prime added */
|
|
__CZ__int_logs[j,1] //= __CZ__int_logs[k,1];
|
|
}
|
|
|
|
k++;
|
|
if(k>=limit) break;
|
|
/* Erastothenes-sieve: look for next prime. */
|
|
while(__CZ__int_logs[k,0]!=0){
|
|
k++;
|
|
if(k>=limit) break;
|
|
}
|
|
}
|
|
/* Second run to include the last factor */
|
|
for(k=1;k<=limit;k++){
|
|
if(__CZ__int_logs[k,1] != k){
|
|
__CZ__int_logs[k,0] +=__CZ__int_logs[ __CZ__int_logs[k,1],0];
|
|
__CZ__int_logs[k,1] = 0;
|
|
}
|
|
}
|
|
|
|
epsilon(eps);
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
|
|
/*
|
|
* restore internal function from resource debugging
|
|
*/
|
|
config("resource_debug", resource_debug_level),;
|
|
if (config("resource_debug") & 3) {
|
|
print "lnseries(limit)";
|
|
print "lnfromseries(n)";
|
|
print "deletelnseries()";
|
|
}
|