[lp_math_log]

Description

Returns the natural log of a number.  Optionally can choose any base.

Requires [lp_math_e]

Sample Usage

loop: 20;
loop_count ' ';
lp_math_log: loop_count, 2;
'
';
/loop;

Returns:

1 0.00000000000000000000000000000000
2 1.00000000000000000000000000000000
3 1.58496250072115630000000000000000
4 2.00000000000000000000000000000000
5 2.32192809488736220000000000000000
6 2.58496250072115610000000000000000
7 2.80735492205760420000000000000000
8 3.00000000000000000000000000000000
9 3.16992500144231260000000000000000
10 3.32192809488736260000000000000000
11 3.45943161863729780000000000000000
12 3.58496250072115650000000000000000
13 3.70043971814109220000000000000000
14 3.80735492205760370000000000000000
15 3.90689059560851870000000000000000
16 4.00000000000000000000000000000000
17 4.08746284125034000000000000000000
18 4.16992500144231220000000000000000
19 4.24792751344358520000000000000000
20 4.32192809488736260000000000000000

Source Code

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[

define_tag:'lp_math_log',
		-description='Returns the natural log of a number.  Optionally can choose any base.',
		-priority='replace',
		-required='decimal',
		-optional='base';

	// http://mathforum.org/library/drmath/view/55568.html
	
	if: !(local_defined:'base');
		local:'base' = lp_math_e;
	/if;
	
	return: lp_decimal_precisionset:(decimal:(decimal:(math_log: (decimal: #decimal))) / (decimal:(math_log: (decimal: #base))));
	
/define_tag;

]

Related Tags

• lp_math_antilog

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