ptable3 — Accesses table values by direct indexing with cubic interpolation.
ares ptable3 andx, ifn [, ixmode] [, ixoff] [, iwrap]
ires ptable3 indx, ifn [, ixmode] [, ixoff] [, iwrap]
kres ptable3 kndx, ifn [, ixmode] [, ixoff] [, iwrap]
ifn -- function table number.
ixmode (optional) -- index data mode. The default value is 0.
0 = raw index
1 = normalized (0 to 1)
ixoff (optional) -- amount by which index is to be offset. For a table with origin at center, use tablesize/2 (raw) or .5 (normalized). The default value is 0.
iwrap (optional) -- wraparound index flag. The default value is 0.
0 = nowrap (index < 0 treated as index=0; index > tablesize sticks at index=size)
1 = wraparound.
ptable3 is identical to table3, except that it uses does not require the table to have a power of two size.