log: Difference between revisions

Latest revision as of 19:43, 3 September 2024

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Description

Description:: Base-10 logarithm of x.

The function of log(x) will never touch the y-axis.
Groups:: Math

Syntax

Syntax:: log x
Parameters:: x: Number - a positive number
Return Value:: Number

Examples

Example 1:: _log = log 10;
Example 2:: _log = log abs -10;
Example 3:: finite log -10; // Returns false

Additional Information

See also:: Math Commands Logarithm

Notes

: Report bugs on the Feedback Tracker and/or discuss them on the Arma Discord or on the Forums.
Only post proven facts here! Add Note

: Posted on 23:14, 16 Jun 2014
ffur2007slx2_5: To clarify:
y = 10 ^ x // x = log y
People use logarithm at the purpose of simplifying multiplication via exponents plus years before.
23456*45634 = 1.07039e9 log 23456 = 4.37025; log 45634 = 4.65929; (log 23456) + (log 45634) = 9.02954 10^((log 23456) + (log 45634)) = 10 ^ 9.02954 // same as 23456*45634
As modern usage, for instance, to evaluate another exponent when multiple is known (Which magnitude is 4 times stronger than 8.3 earthquake?):
//_Unknown = log x; 8.3 = log y // x = 10 ^_Unknown; y = 10 ^8.3 //x/y = (10 ^_Unknown)/(10 ^8.3) = log 4 // x/y = _Unknown – 8.3 = 0.6 //_result = 8.9 magnitude _result = (log 4) + 8.3

@@ Line 1: / Line 1: @@
-back to [[Scripting_Reference#L|COMREF]]
+{{RV|type=command
-<h2 style="color:#000066"> '''log ''x'''''</h2>
+|game1= ofp
+|version1= 1.00
+|game2= ofpe
+|version2= 1.00
-'''Operand types:'''
+|game3= arma1
+|version3= 1.00
-'''x:''' [[Number]]
+|game4= arma2
+|version4= 1.00
-'''Type of returned value:'''
+|game5= arma2oa
+|version5= 1.50
-[[Number]]
+|game6= tkoh
+|version6= 1.00
-'''Description:'''
+|game7= arma3
+|version7= 0.50
-Base-10 logarithm of '''x'''.
+|gr1= Math
+|descr= Base-10 logarithm of x. [[File:A3 logx.jpg|thumb|The function of log(x) will never touch the y-axis.]]
-'''Example:'''
+|s1= [[log]]  x
-_log = '''log''' 10 ..........Result is 1
+|p1= x: [[Number]] - a positive number
+|r1= [[Number]]
+|x1= <sqf>_log = log 10;</sqf>
+|x2= <sqf>_log = log abs -10;</sqf>
+|x3= <sqf>finite log -10; // Returns false</sqf>
+|seealso= [[Math Commands]] {{Link|https://en.wikipedia.org/wiki/Logarithm|Logarithm}}
+}}
+<dl class="command_description">
+<dt></dt>
+<dd class="notedate">Posted on 23:14, 16 Jun 2014</dd>
+<dt class="note">[[User:ffur2007slx2_5|ffur2007slx2_5]]</dt>
+<dd class="note">
+To clarify:
+<sqf>y = 10 ^ x // x = log y</sqf>
+People use logarithm at the purpose of simplifying multiplication via exponents plus years before.
+<sqf>
+*45634 = 1.07039e9
+log 23456 = 4.37025; log 45634 = 4.65929; (log 23456) + (log 45634) = 9.02954
+^((log 23456) + (log 45634)) = 10 ^ 9.02954  // same as 23456*45634
+</sqf>
+As modern usage, for instance, to evaluate another exponent when multiple is known (Which magnitude is 4 times stronger than 8.3 earthquake?):
+<sqf>
+//_Unknown = log x; 8.3 = log y
+// x = 10 ^_Unknown; y = 10 ^8.3
+//x/y = (10 ^_Unknown)/(10 ^8.3) = log 4
+// x/y = _Unknown – 8.3 = 0.6
+//_result = 8.9 magnitude
+_result = (log 4) + 8.3
+</sqf>
+</dd>
+</dl>