Programmer Guide/SPU Reference/LOG: Difference between revisions

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{{DISPLAYTITLE:{{SUBPAGENAME}}}}
{{DISPLAYTITLE:{{SUBPAGENAME}}}}
====LOG====
Compute logarithm of <var>A</var> to the base <var>B</var>.
 
==<code>[SPU LOG <var>A B</var> OUT <var>Y</var>]</code>==
=====Usage:=====
{|class="einrahmen"
 
!In !!Out !!Description
<code>LOG <var>a b</var></code>
 
=====Inputs:=====
 
{|
|-
|-
|a
|<var>A<sub>number</sub></var>, <var>B<sub>number</sub></var>
|number or vector
|<var>Y<sub>number</sub></var>
|<var>Y</var> = log<sub><var>B</var></sub>(<var>A</var>)
|-
|-
|b
|<var>A<sub>vector</sub></var>, <var>B<sub>number</sub></var>
|number or vector
|<var>Y<sub>vector</sub></var>
|}
|<var>Y</var>[i] = <var>A</var>[i] ^ <var>B</var>
 
=====Outputs:=====
 
{|
|-
|-
|<var>y</var>
|<var>A<sub>vector</sub></var>, <var>B<sub>vector</sub></var>  
|number or vector (same type as a)
|<var>Y<sub>vector</sub></var>
|<var>Y</var>[i] = <var>A</var>[i] ^ <var>B</var>[i]
|}
|}
 
with: 0 &le; i &lt; length of <var>A<sub>vector</sub></var>
=====Function:=====
;See also:
 
<[[../#Signal Processing Atoms|SP-atoms]]>
Compute logarithm of <var>a</var> to base <var>b</var>.
<!-- AN, 2.5.2011 -->
 
if <var>a</var> and <var>b</var> are numbers: <var>y</var> = log<var>b</var>(<var>a</var>)
 
if <var>a</var> is a vector and <var>b</var> a number: <var>y</var>[i] = log<var>b</var>(<var>a</var>[i])
 
if <var>a</var> and <var>b</var> are vectors: <var>y</var>[i] = log<var>b</var>[i](<var>a</var>[i])
 
Both <var>a</var>|<var>a</var>[i] and <var>b</var>|<var>b</var>[i] must be greater than zero (otherwise the result is set to 0). If <var>a</var>|<var>a</var>[i] is smaller than the smallest number representable in single precision, the logarithm is set to the exponent of this number.

Revision as of 12:36, 2 May 2011

Compute logarithm of A to the base B.

[SPU LOG A B OUT Y]

In Out Description
Anumber, Bnumber Ynumber Y = logB(A)
Avector, Bnumber Yvector Y[i] = A[i] ^ B
Avector, Bvector Yvector Y[i] = A[i] ^ B[i]

with: 0 ≤ i < length of Avector

See also

<SP-atoms>

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