3 # Test blog function (and bpow, since it uses blog), as well as bexp().
5 # It is too slow to be simple included in bigfltpm.inc, where it would get
6 # executed 3 times. One time would be under BareCalc, which shouldn't make any
7 # difference since there is no CALC->_log() function, and one time under a
8 # subclass, which *should* work.
10 # But it is better to test the numerical functionality, instead of not testing
11 # it at all (which did lead to wrong answers for 0 < $x < 1 in blog() in
12 # versions up to v1.63, and for bsqrt($x) when $x << 1 for instance).
15 use Test::More tests => 70;
20 my $cl = "Math::BigInt";
22 #############################################################################
23 # test log($n) in BigInt (broken until 1.80)
25 is ($cl->new(2)->blog(), '0', "blog(2)");
26 is ($cl->new(288)->blog(), '5',"blog(288)");
27 is ($cl->new(2000)->blog(), '7', "blog(2000)");
29 #############################################################################
30 # test exp($n) in BigInt
32 is ($cl->new(1)->bexp(), '2', "bexp(1)");
33 is ($cl->new(2)->bexp(), '7',"bexp(2)");
34 is ($cl->new(3)->bexp(), '20', "bexp(3)");
36 #############################################################################
37 #############################################################################
40 #############################################################################
41 # test log(2, N) where N > 67 (broken until 1.82)
43 $cl = "Math::BigFloat";
45 # These tests can take quite a while, but are nec. Maybe protect them with
48 # this triggers the calculation and caching of ln(2):
49 is ($cl->new(5)->blog(undef,71),
50 '1.6094379124341003746007593332261876395256013542685177219126478914741790');
52 # if the cache was correct, we should get this result, fast:
53 is ($cl->new(2)->blog(undef,71),
54 '0.69314718055994530941723212145817656807550013436025525412068000949339362');
56 is ($cl->new(11)->blog(undef,71),
57 '2.3978952727983705440619435779651292998217068539374171752185677091305736');
59 is ($cl->new(21)->blog(undef,71),
60 '3.0445224377234229965005979803657054342845752874046106401940844835750742');
62 #############################################################################
64 # These tests are now really fast, since they collapse to blog(10), basically
65 # Don't attempt to run them with older versions. You are warned.
68 is ($cl->new(-2)->blog(), 'NaN');
69 is ($cl->new(-1)->blog(), 'NaN');
70 is ($cl->new(-10)->blog(), 'NaN');
71 is ($cl->new(-2,2)->blog(), 'NaN');
73 my $ten = $cl->new(10)->blog();
75 # 10 is cached (up to 75 digits)
76 is ($cl->new(10)->blog(), '2.302585092994045684017991454684364207601');
78 # 0.1 is using the cached value for log(10), too
80 is ($cl->new(0.1)->blog(), -$ten);
81 is ($cl->new(0.01)->blog(), -$ten * 2);
82 is ($cl->new(0.001)->blog(), -$ten * 3);
83 is ($cl->new(0.0001)->blog(), -$ten * 4);
86 is ($cl->new(2)->blog(), '0.6931471805599453094172321214581765680755');
87 is ($cl->new(4)->blog(), $cl->new(2)->blog * 2);
89 # These are still slow, so do them only to 10 digits
91 is ($cl->new('0.2')->blog(undef,10), '-1.609437912');
92 is ($cl->new('0.3')->blog(undef,10), '-1.203972804');
93 is ($cl->new('0.4')->blog(undef,10), '-0.9162907319');
94 is ($cl->new('0.5')->blog(undef,10), '-0.6931471806');
95 is ($cl->new('0.6')->blog(undef,10), '-0.5108256238');
96 is ($cl->new('0.7')->blog(undef,10), '-0.3566749439');
97 is ($cl->new('0.8')->blog(undef,10), '-0.2231435513');
98 is ($cl->new('0.9')->blog(undef,10), '-0.1053605157');
100 is ($cl->new('9')->blog(undef,10), '2.197224577');
102 is ($cl->new('10')->blog(10,10), '1.000000000');
103 is ($cl->new('20')->blog(20,10), '1.000000000');
104 is ($cl->new('100')->blog(100,10), '1.000000000');
106 is ($cl->new('100')->blog(10,10), '2.000000000'); # 10 ** 2 == 100
107 is ($cl->new('400')->blog(20,10), '2.000000000'); # 20 ** 2 == 400
109 is ($cl->new('4')->blog(2,10), '2.000000000'); # 2 ** 2 == 4
110 is ($cl->new('16')->blog(2,10), '4.000000000'); # 2 ** 4 == 16
112 is ($cl->new('1.2')->bpow('0.3',10), '1.056219968');
113 is ($cl->new('10')->bpow('0.6',10), '3.981071706');
115 # blog should handle bigint input
116 is (Math::BigFloat::blog(Math::BigInt->new(100),10), 2, "blog(100)");
118 #############################################################################
119 # some integer results
120 is ($cl->new(2)->bpow(32)->blog(2), '32', "2 ** 32");
121 is ($cl->new(3)->bpow(32)->blog(3), '32', "3 ** 32");
122 is ($cl->new(2)->bpow(65)->blog(2), '65', "2 ** 65");
124 my $x = Math::BigInt->new( '777' ) ** 256;
125 my $base = Math::BigInt->new( '12345678901234' );
126 is ($x->copy()->blog($base), 56, 'blog(777**256, 12345678901234)');
128 $x = Math::BigInt->new( '777' ) ** 777;
129 $base = Math::BigInt->new( '777' );
130 is ($x->copy()->blog($base), 777, 'blog(777**777, 777)');
132 #############################################################################
133 # test for bug in bsqrt() not taking negative _e into account
134 test_bpow ('200','0.5',10, '14.14213562');
135 test_bpow ('20','0.5',10, '4.472135955');
136 test_bpow ('2','0.5',10, '1.414213562');
137 test_bpow ('0.2','0.5',10, '0.4472135955');
138 test_bpow ('0.02','0.5',10, '0.1414213562');
139 test_bpow ('0.49','0.5',undef , '0.7');
140 test_bpow ('0.49','0.5',10 , '0.7000000000');
141 test_bpow ('0.002','0.5',10, '0.04472135955');
142 test_bpow ('0.0002','0.5',10, '0.01414213562');
143 test_bpow ('0.0049','0.5',undef,'0.07');
144 test_bpow ('0.0049','0.5',10 , '0.07000000000');
145 test_bpow ('0.000002','0.5',10, '0.001414213562');
146 test_bpow ('0.021','0.5',10, '0.1449137675');
147 test_bpow ('1.2','0.5',10, '1.095445115');
148 test_bpow ('1.23','0.5',10, '1.109053651');
149 test_bpow ('12.3','0.5',10, '3.507135583');
151 test_bpow ('9.9','0.5',10, '3.146426545');
152 test_bpow ('9.86902225','0.5',10, '3.141500000');
153 test_bpow ('9.86902225','0.5',undef, '3.1415');
155 test_bpow ('0.2','0.41',10, '0.5169187652');
157 #############################################################################
158 # test bexp() with cached results
160 is ($cl->new(1)->bexp(), '2.718281828459045235360287471352662497757', 'bexp(1)');
161 is ($cl->new(2)->bexp(40), $cl->new(1)->bexp(45)->bpow(2,40), 'bexp(2)');
163 is ($cl->new("12.5")->bexp(61), $cl->new(1)->bexp(65)->bpow(12.5,61), 'bexp(12.5)');
165 #############################################################################
166 # test bexp() with big values (non-cached)
168 is ($cl->new(1)->bexp(100),
169 '2.718281828459045235360287471352662497757247093699959574966967627724076630353547594571382178525166427',
172 is ($cl->new("12.5")->bexp(91), $cl->new(1)->bexp(95)->bpow(12.5,91),
173 'bexp(12.5) to 91 digits');
178 #############################################################################
181 my ($x,$y,$scale,$result) = @_;
183 print "# Tried: $x->bpow($y,$scale);\n"
184 unless ok ($cl->new($x)->bpow($y,$scale),$result);