John,
The key's to the user_functions dictionary should be strings that map to
SymPy functions in the expressions:
In [18]: print sympy.ccode(sympy.sin(sympy.symbols('x')),
user_functions={"sin": "std::sin"})
std::sin(x)
In [19]: print sympy.ccode(sympy.Abs(sympy.symbols('x')),
user_functions={"Abs": "std::abs"})
std::abs(x)
Jason
moorepants.info
+01 530-601-9791
On Thu, Feb 26, 2015 at 8:56 AM, John Peterson <[email protected]> wrote:
> Hi,
>
> It's entirely possible I'm using ccode wrong, but I can't seem to get it
> to recognize my custom replacements for sqrt, fabs, or pow. Here's a
> simple test case:
>
> #!/usr/bin/env python
>> from sympy import *
>>
>
>
> print ccode(sympify('sqrt(x)'), user_functions={"sqrt": "std::sqrt"})
>> print ccode(sympify('Abs(x)'), user_functions={"fabs": "std::abs"})
>> print ccode(sympify('x**2'), user_functions={"pow": "std::pow"})
>
>
> On my system, this prints:
>
> sqrt(x)
>> fabs(x)
>> pow(x, 2)
>
>
> I can of course work around this pretty easily with text replacement, so
> it's not a big deal...
>
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