1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
|
#!/usr/bin/env perl
#
# make-logtab
#
# Generate a table of logarithms of 2 in various bases, for use in
# estimating the output sizes of various bases.
#
# by Michael J. Fromberger <sting@linguist.dartmouth.edu>
# Developed 1999-2006.
# Assigned to the public domain as of 2002; see README.
#
# $Id: make-logtab,v 1.2 2006/07/07 19:35:02 sting Exp $
#
$ARRAYNAME = $ENV{'ARRAYNAME'} || "s_logv_2";
$ARRAYTYPE = $ENV{'ARRAYTYPE'} || "double";
printf("const %s %s[] = {\n %0.9f, %0.9f, ",
$ARRAYTYPE, $ARRAYNAME, 0, 0);
$brk = 2;
for($ix = 2; $ix < 64; $ix++) {
printf("%0.9f, ", (log(2)/log($ix)));
$brk = ($brk + 1) & 3;
if(!$brk) {
printf("\t/* %2d %2d %2d %2d */\n ",
$ix - 3, $ix - 2, $ix - 1, $ix);
}
}
printf("%0.9f\n};\n\n", (log(2)/log($ix)));
exit 0;
|
