### 86.6 Package rducon

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Function: reduce_consts (expr)

  Replaces constant subexpressions of expr with constructed constant atoms, saving the definition of all these constructed constants in the list of equations `const_eqns`, and returning the modified expr. Those parts of expr are constant which return `true` when operated on by the function `constantp`. Hence, before invoking `reduce_consts`, one should do

      declare ([objects to be given the constant property], constant)$

  to set up a database of the constant quantities occurring in your expressions.

  If you are planning to generate Fortran output after these symbolic calculations, one of the first code sections should be the calculation of all constants. To generate this code segment, do

      map ('fortran, const_eqns)$

  Variables besides `const_eqns` which affect `reduce_consts` are:

  `const_prefix` (default value: `xx`) is the string of characters used to prefix all symbols generated by `reduce_consts` to represent constant subexpressions.

  `const_counter` (default value: 1) is the integer index used to generate unique symbols to represent each constant subexpression found by `reduce_consts`.

  `load ("rducon")` loads this function. `demo ("rducon")` shows a demonstration of this function.

  Categories:Package rducon ·Expressions ·