Re: [isabelle] No Code Equation for LIMSEQ

You are trying to generate code for real numbers and functions defined by limits. Such definitions are not executable. You have two choices: you can generate code that utilizes machine floats, or you can generate code that realizes arbitrary precision interval arithmetic. The former is a quick hack, the latter is sound but more work. Depending on what you want, we can tell you how to do it.


Am 10/11/2011 00:23, schrieb Dave Thayer:
For technical reasons I am restricted at the moment to using Isabelle2009
I am trying to use code generation to generate code for trigonometric functions and other functions that utilize the real datatype.

I have the following code that is attempting to exercise this ability.

definition test_pi :: "real" where "test_pi = pi"
definition test_sin :: "real =>  real" where "test_sin x = sin x"
definition test_cos :: "real =>  real" where "test_cos x = cos x"
definition test_tan :: "real =>  real" where "test_tan x = tan x"
definition test_arcsin :: "real =>  real" where "test_arcsin x = arcsin x"
definition test_arccos :: "real =>  real" where "test_arccos x = arccos x"
definition test_arctan :: "real =>  real" where "test_arctan x = arctan x"
definition test_trig :: "real =>  real =>  real =>  real" where "test_trig x y a = cos (arctan (y / x) + sin a - pi/4)"

  test_pi test_sin test_cos test_tan
  test_arcsin test_arccos test_arctan
in OCaml
module_name "TestCodeGen"
file ""

I am getting the following error message
### No code equation for LIMSEQ, The

Does anybody know where the code equations for LIMSEQ are defined?
I have looked through the HOL/Library but found nothing  so far.

Thank you for your time,
David Thayer

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