Difference between revisions of "Math.frexp"
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=== Description === | === Description === | ||
| − | Returns m and e such that v = | + | Used to split a floating-point number (v) into a normalized fraction (a mantissa) and an integer exponent. |
| − | + | <syntaxhighlight lang="lua"> | |
| − | + | (number) (number) = math.frexp(v) | |
| − | + | </syntaxhighlight> | |
| + | |||
| + | Returns m and e such that v = m*2^e, e is an integer and the absolute value of m is in the range [0.5, 1) (or zero when v is zero). The mantissa has the same sign as the argument v. | ||
=== Parameters === | === Parameters === | ||
| Line 13: | Line 15: | ||
=== Return values === | === Return values === | ||
| − | '''Returns''' (number) | + | '''Returns''' (number) the mantissa, a multiplier in the range [0.5, 1) (normalized fraction)<br/> |
| + | '''Returns''' (number) the exponent as an integer<br/> | ||
| + | |||
| + | === Example === | ||
| + | <syntaxhighlight lang="lua"> | ||
| + | local m, n = math.frexp(16.4) | ||
| + | print("mantissa", m, "exponent", n) -- mantissa 0.5125 exponent 5 | ||
| + | print(m*2^n) -- 16.4 | ||
| + | </syntaxhighlight> | ||
| + | |||
| + | === Note === | ||
| + | [[math.ldexp]] is the inverse operation. | ||
{{Math}} | {{Math}} | ||
Latest revision as of 14:30, 13 July 2023
Available since: Gideros 2011.6
Class: math
Description
Used to split a floating-point number (v) into a normalized fraction (a mantissa) and an integer exponent.
(number) (number) = math.frexp(v)
Returns m and e such that v = m*2^e, e is an integer and the absolute value of m is in the range [0.5, 1) (or zero when v is zero). The mantissa has the same sign as the argument v.
Parameters
v: (number) value
Return values
Returns (number) the mantissa, a multiplier in the range [0.5, 1) (normalized fraction)
Returns (number) the exponent as an integer
Example
local m, n = math.frexp(16.4)
print("mantissa", m, "exponent", n) -- mantissa 0.5125 exponent 5
print(m*2^n) -- 16.4
Note
math.ldexp is the inverse operation.
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