On Sun, Mar 19, 2023 at 7:09 PM brombo <[email protected]> wrote:
>
> First I think there is a problem with ccode doing what it is supposed to do.
> Consider the following code -
> (x,y,th) = symbols(r"x' y' \theta")
>
> then
> x' = ccode(x)
> y' = ccode(y)
> \theta = ccode(th)
>
> I don't think x', y', and \theta are legal program variables in c.
I think this functionality exists in some of the other printers. It
does exist in lambdify, so it shouldn't be too hard to port to the C
printer.
>
> Also I have looking at codegen examples and wish to know if the following
> conclusion is correct. If I have a python function (example) -
>
> def W(x):
> s = 1
> for i in range(10):
> s += x**i
> return s
>
> there is no simple way (if any) to convert it to -
Starting with Python code is harder, but you can represent this sort
of thing using the codegen ast nodes in sympy.codegen module.
Aaron Meurer
>
> double W(double x)
> {
> double s = 1;
> int i;
> for (i=0;i<10;++i)
> {
> s = s+pow(x,i);
> }
> return s;
> }
> On Saturday, March 18, 2023 at 11:14:20 AM UTC-4 [email protected] wrote:
>>
>> You can make custom printers for any SymPy function to return what you
>> desire. Subclass the C printer and overwrite/create methods for your
>> functions. The current c code printer does not target any specialized C
>> libraries (but that would be a nice addition!).
>>
>> Jason
>> moorepants.info
>> +01 530-601-9791
>>
>>
>> On Sat, Mar 18, 2023 at 3:18 PM brombo <[email protected]> wrote:
>>>
>>> I have looked further and while ccode(expr) can export functions like sin,
>>> cox, exp it cannot export special functions such as bessel, elliptic, etc..
>>> Is there a way to export special functions into c-code?
>>>
>>> On Saturday, March 18, 2023 at 9:52:48 AM UTC-4 brombo wrote:
>>>>
>>>> Does the C code generator generate special function calls with the same
>>>> syntax that is used in the gsl (GNU Scientific Library). For example is
>>>> the sympy call besselj(nu,z) translated to J(nu,z) etc.?
>>>
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