Description

This opcode reads vectors from tables at a-rate.

Syntax

vtablea  andx, kfn, kinterp, ixmode, aout1 [, aout2, aout3, .... , aoutN ]

Initialization

ixmode - index data mode. The default value is 0.

== 0 index is treated as a raw table location,

== 1 index is normalized (0 to 1).

Performance

andx - Index into f-table, either a positive number range matching the table length (ixmode = 0) or a 0 to 1 range (ixmode != 0).

kfn - table number

kinterp - switch beetween interpolated or non-interpolated output. 0 -> non-interpolation , non-zero -> interpolation activated

aout1...aoutN - output vector elements

This opcode is useful in all cases in which one needs to access sets of values associated to unique indexes (for example, multi-channel samples, STFT bin frames, spectral formants, p-field based scores etc.). The number of elements of each vector (length of the vector) is determined by the number of optional arguments on the right (aout1 , aout2, aout3, .... aoutN).

vtablea allows the user to switch beetween interpolated or non-interpolated output at k-rate by means of kinterp argument.

vtablea allows also to switch the table number at k-rate (but this is possible only when vector frames of each used table have the same number of elements, otherwise unpredictable results could occurr), as well as to choose indexing style (raw or normalized, see also ixmode argument of table opcode ).

Notice that no wrap nor limit mode is implemented. So, if an index attempt to access to a zone not allocated by the table, Csound will probably crash. However this drawback can be easily avoided by using wrap or limit opcodes applied to indexes before using vtablea, in order to correct eventual out-of-range values.

See also

Tables of vectors operators

Credits

Written by Gabriel Maldonado.

New in Csound 5 (Previously available only on CsoundAV)