Hi
I can't comment on the first part but for the boolean expression, it's a
design issue. Booleans have not been derived from Expr class in sympy which
is why it fails.
Sudhanshu Mishra
On Tue, Aug 25, 2015 at 2:39 AM, Nico <nico.schloe...@gmail.com> wrote:
> With `codegen`, one can generate code from a sympy expression. Typically,
> it is assumed that the return value is a scalar.
>
> In one of my use cases, the return value is Boolean. (The answer to "Is x
> inside a particular domain?")
> The hack I employed so far is to generate the code as usual
> ```
> from sympy import *
> from sympy.utilities.codegen import codegen
>
> x = Symbol('x')
> expr = x**2 - x + sin(x) < x**3 - 2*x - cos(5*x) # ok
> [(c_name, c_code), (h_name, c_header)] = codegen(("f", expr), "C")
> print(c_code)
> ```
> and then regex the relevant part out of `c_code`. (If you know of a better
> way to handle this, I'll be happy to hear about it.)
> This works alright, but fails in the most simple cases, e.g.,
> ```
> expr = True
> ```
> with
> ```
> TypeError: The first argument must be a sympy expression.
> ```
> Quite understandable.
>
> Is there a better way/hack to support this kind of code generation?
>
> Cheers,
> Nico
>
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