Programmer Guide/SPU Reference/LOG: Difference between revisions
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|<var>A<sub>vector</sub></var>, <var>B<sub>number</sub></var> | |<var>A<sub>vector</sub></var>, <var>B<sub>number</sub></var> | ||
|<var>Y<sub>vector</sub></var> | |<var>Y<sub>vector</sub></var> | ||
|<var>Y</var>[i] = <var> | |<var>Y</var>[i] = log<sub><var>B</var></sub>(<var>A</var>[i]) | ||
|- | |- | ||
|<var>A<sub>vector</sub></var>, <var>B<sub>vector</sub></var> | |<var>A<sub>vector</sub></var>, <var>B<sub>vector</sub></var> | ||
|<var>Y<sub>vector</sub></var> | |<var>Y<sub>vector</sub></var> | ||
|<var>Y</var>[i] = <var> | |<var>Y</var>[i] = log<sub><var>B</var>[i]</sub>(<var>A</var>[i]) | ||
|} | |} | ||
with: 0 ≤ i < length of <var>A<sub>vector</sub></var> | with: 0 ≤ i < length of <var>A<sub>vector</sub></var> | ||
note: | |||
:The logarithm is computed using the following formula: <code>y = ln(a)/ln(b)</code>. | |||
:<code>ln</code> is the natural logarithm and both <code>a</code> and <code>b</code> must be greater than zero | |||
;See also: | ;See also: | ||
<[[../#Signal Processing Atoms|SP-atoms]]> | <[[../#Signal Processing Atoms|SP-atoms]]> | ||
<!-- AN, 2.5.2011 --> | <!-- AN, 2.5.2011 --> | ||
Latest revision as of 12:39, 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] = logB(A[i]) |
| Avector, Bvector | Yvector | Y[i] = logB[i](A[i]) |
with: 0 ≤ i < length of Avector
note:
- The logarithm is computed using the following formula:
y = ln(a)/ln(b). lnis the natural logarithm and bothaandbmust be greater than zero- See also
<SP-atoms>
