tb
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## tb

tb0, tb1, tb2, tb3, tb4, tb5, tb6, tb7, tb8, tb9, tb10, tb11, tb12, tb13, tb14, tb15, tb0_init, tb1_init, tb2_init, tb3_init, tb4_init, tb5_init, tb6_init, tb7_init, tb8_init, tb9_init, tb10_init, tb11_init, tb12_init, tb13_init, tb14_init, tb15_init — Table Read Access inside expressions.

## Description

| Note
These opcodes have been largely superceded by the functional form of the opcode tab

Allow to read tables in function fashion, to be used inside expressions. At earlier times Csound only supported functions with a single input argument. However, to access table elements, user must provide two numbers, i.e. the number of table and the index of element. So, in order to allow to access a table element with a function, a previous preparation step should be done.

## Syntax

    tb0_init ifn

    tb1_init ifn

    tb2_init ifn

    tb3_init ifn

    tb4_init ifn

    tb5_init ifn

    tb6_init ifn

    tb7_init ifn

    tb8_init ifn

    tb9_init ifn

    tb10_init ifn

    tb11_init ifn

    tb12_init ifn

    tb13_init ifn

    tb14_init ifn

    tb15_init ifn

    iout = tb0(iIndex)

    kout = tb0(kIndex)

    iout = tb1(iIndex)

    kout = tb1(kIndex)

    iout = tb2(iIndex)

    kout = tb2(kIndex)

    iout = tb3(iIndex)

    kout = tb3(kIndex)

    iout = tb4(iIndex)

    kout = tb4(kIndex)

    iout = tb5(iIndex)

    kout = tb5(kIndex)

    iout = tb6(iIndex)

    kout = tb6(kIndex)

    iout = tb7(iIndex)

    kout = tb7(kIndex)

    iout = tb8(iIndex)

    kout = tb8(kIndex)

    iout = tb9(iIndex)

    kout = tb9(kIndex)

    iout = tb10(iIndex)

    kout = tb10(kIndex)

    iout = tb11(iIndex)

    kout = tb11(kIndex)

    iout = tb12(iIndex)

    kout = tb12(kIndex)

    iout = tb13(iIndex)

    kout = tb13(kIndex)

    iout = tb14(iIndex)

    kout = tb14(kIndex)

    iout = tb15(iIndex)

    kout = tb15(kIndex)

## Performance

There are 16 different opcodes whose name is associated with a number from 0 to 15. User can associate a specific table with each opcode (so the maximum number of tables that can be accessed in function fashion is 16). Prior to access a table, user must associate the table with one of the 16 opcodes by means of an opcode chosen among tb0_init, ..., tb15_init. For example,

          tb0_init  1

associates table 1 with tb0( ) function, so that, each element of table 1 can be accessed (in function fashion) with:

          kvar = tb0(k_some_index_of_table1) * k_some_other_var

          ivar = tb0(i_some_index_of_table1) + i_some_other_var

etc...

By using these opcodes, user can drastically reduce the number of lines of an orchestra, improving its readability.

## Credits

Written by Gabriel Maldonado.

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