OptiVec: VF_tantab2

VF_tantab2

VD_tantab2

VE_tantab2

VF_tantab3

VD_tantab3

VE_tantab3

Table of tangent values for arguments between 0 and p/2.

Syntax C/C++	#include <xmath.h> extern float VF_tantab2[ VF_tabsz2+1 ]; extern double VD_tantab2[ VD_tabsz2+1 ]; extern extended VE_tantab2[ VE_tabsz2+1 ]; extern float VF_tantab3[ VF_tabsz3+1 ]; extern double VD_tantab3[ VD_tabsz3+1 ]; extern extended VE_tantab3[ VE_tabsz3+1 ];
Pascal/Delphi	uses FTANTAB2, DTANTAB2, ETANTAB2, FTANTAB3, DTANTAB3, ETANTAB3; VF_tantab2: array[0..VF_tabsz2] of Single; VD_tantab2: array[0..VD_tabsz2] of Double; VE_tantab2: array[0..VE_tabsz2] of Extended; VF_tantab3: array[0..VF_tabsz3] of Single; VD_tantab3: array[0..VD_tabsz3] of Double; VE_tantab3: array[0..VE_tabsz3] of Extended;

Description

VF_tantab2[ i ] = tan( i/(2*VF_tabsz2) * p ), i=0,...,VF_tabsz2−1
VF_tantab3[ i ] = tan( i/(2*VF_tabsz3) * p ), i=0,...,VF_tabsz3−1
VF_tantab2[ VF_tabsz2 ] = VF_tantab3[ VF_tabsz3 ] = 0;

These look-up tables of tangent values for arguments between 0 and p/2 are used by VF_tanrpi2 and the other functions of that family and are also available for other purposes. Since the tangent of p/2 is not defined, zero is stored at its place.
C/C++: The symbols VF_tabsz2 etc., denoting the size of the tables, are defined in <xmath.h>.
Pascal/Delphi: The symbols VF_tabsz2 etc. are defined in the same units as the tables themselves.
FreePascal/Lazarus: These tables are not available for FreePascal/Lazarus.