Toni: moved Programmer Guide/SPU Reference/TLOOKUP - table lookup, interpolation to Programmer Guide/SPU Reference/TLOOKUP

2011-04-28T10:15:11Z

moved Programmer Guide/SPU Reference/TLOOKUP - table lookup, interpolation to Programmer Guide/SPU Reference/TLOOKUP

← Older revision	Revision as of 12:15, 28 April 2011
(No difference)

Admin: 1 revision: Initial import

2010-11-18T16:31:55Z

1 revision: Initial import

← Older revision	Revision as of 18:31, 18 November 2010
(No difference)

193.171.195.8: initial import

2010-05-17T13:05:27Z

initial import

New page

{{DISPLAYTITLE:{{SUBPAGENAME}}}}
====TLOOKUP - table lookup, interpolation====

=====Usage:=====

<code>TLOOKUP <var>X XP YP TYPE INV</var></code>

=====Inputs:=====

{|
|-
|X
|argument (number or vector)
|-
|XP
|vector of X<nowiki>-</nowiki>values
|-
|YP
|vector of Y<nowiki>-</nowiki>values: <var>YP</var>[i] = f(<var>XP</var>[i])
|-
|TYPE
|type of interpolation
|-
|INV
|selects how to process invalid X<nowiki>-</nowiki>values
|}

=====Outputs:=====

{|
|-
|Y
|interpolated function values (same type as X)
|}

=====Function:=====

For each <var>X</var>-value, an interpolated <var>Y</var>-value for the function defined by the value pairs (<var>XP</var>[i], <var>YP</var>[i]) is computed. All inputs except <var>TYPE</var> and <var>INV</var> are updated at the beginning of each evaluation cycle.

Interpolation method selected by input <var>TYPE</var>{|
|-
|value of TYPE
|interpolation method
|-
|0 or SPLINE
|spline interpolation, not yet implemented
|-
|1 or LINEAR
|linear interpolation between two points of the function
|-
|2 or NEVILLE
|polynomial interpolation using the Neville algorithm
|-
|3 or NEWTON
|polynomial interpolation using the Newton algorithm
|}

Processing of invalid X<nowiki>-</nowiki>Values (values outside the range min(<var>XP</var>)..max(<var>XP</var>)){|
|-
|value of <var>INV</var>
|interpolation method
|-
|0 or EXTRAPOLATE
|the value of Y is extrapolated, cannot be used with <var>TYPE</var>=LINEAR
|-
|1 or TRUNCATE
|the X<nowiki>-</nowiki>value is "forced to be valid"
|-
|2 or LEAVE
|no interpolation, Y is set to <var>X</var>
|}

Programmer Guide/SPU Reference/TLOOKUP - Revision history

Toni: moved Programmer Guide/SPU Reference/TLOOKUP - table lookup, interpolation to Programmer Guide/SPU Reference/TLOOKUP

Admin: 1 revision: Initial import

193.171.195.8: initial import