Difference between revisions of "Math.ldexp"
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__NOTOC__ | __NOTOC__ | ||
'''Available since:''' Gideros 2011.6<br/> | '''Available since:''' Gideros 2011.6<br/> | ||
| + | '''Class:''' [[math]]<br/> | ||
| + | |||
=== Description === | === Description === | ||
| − | + | Used to multiply a floating point value ''v1'' by the number 2 raised to the ''v2'' power. This is called a '''load exponent'''. ''v2'' should be an integer. | |
| − | < | + | <syntaxhighlight lang="lua"> |
(number) = math.ldexp(v1,v2) | (number) = math.ldexp(v1,v2) | ||
| − | </ | + | </syntaxhighlight> |
| + | |||
| + | Returns v1*2^v2. | ||
| + | |||
=== Parameters === | === Parameters === | ||
| − | '''v1''': (number) | + | '''v1''': (number) a floating point value<br/> |
| − | '''v2''': (number) | + | '''v2''': (number) an exponent<br/> |
| + | |||
=== Return values === | === Return values === | ||
| − | '''Returns''' (number) < | + | '''Returns''' (number) the load exponent result<br/> |
| + | |||
| + | === Example === | ||
| + | <syntaxhighlight lang="lua"> | ||
| + | local m, n = math.frexp(16.4) | ||
| + | print("mantissa", m, "exponent", n) | ||
| + | print(m*2^n) | ||
| + | local r = math.ldexp(0.5125, 5) | ||
| + | print("load exponent result", r) -- 16.4 | ||
| + | </syntaxhighlight> | ||
| + | |||
| + | === Note === | ||
| + | [[math.frexp]] is the inversed operation. | ||
| + | |||
| + | {{Math}} | ||
Latest revision as of 15:30, 13 July 2023
Available since: Gideros 2011.6
Class: math
Description
Used to multiply a floating point value v1 by the number 2 raised to the v2 power. This is called a load exponent. v2 should be an integer.
(number) = math.ldexp(v1,v2)
Returns v1*2^v2.
Parameters
v1: (number) a floating point value
v2: (number) an exponent
Return values
Returns (number) the load exponent result
Example
local m, n = math.frexp(16.4)
print("mantissa", m, "exponent", n)
print(m*2^n)
local r = math.ldexp(0.5125, 5)
print("load exponent result", r) -- 16.4
Note
math.frexp is the inversed operation.
- Math
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