Nathan,
I am working on a fix.
Can you provide the exact C expression that you want Piecewise((0, x <
0.5), (1, x >= 0.5)) to generate?
I.e. can you fill in the right hand side here:
assert ccode(Piecewise((0, x < 0.5), (1, x >= 0.5))) == "piecewise(...)"
Ondrej
On Tue, Oct 8, 2013 at 1:47 PM, Nathan Woods <charlesnwo...@gmail.com> wrote:
> I was wondering if there were some kind of estimated time horizon on this.
> Is it just a bug fix with a few hours if work, or is it a new feature that
> would have to be added, potentially taking a few weeks? I'll need to work
> around the problem, if that's the case.
>
> N
> —
> Sent from Mailbox for iPhone
>
>
> On Tue, Oct 8, 2013 at 12:54 AM, F. B. <franz.bona...@gmail.com> wrote:
>>
>> /sympy/tensor/index_methods.pyc
>>
>> I have never worked on this file. The real tensor module is
>> /sympy/tensor/tensor.py, the other files in that directory are tools for
>> code generation (I think), which are able to handle indexed data, but I
>> never used them.
>>
>> On Tuesday, October 8, 2013 8:20:31 AM UTC+2, Ondřej Čertík wrote:
>>>
>>> Nathan,
>>>
>>> On Mon, Oct 7, 2013 at 10:52 PM, Nathan Woods <charle...@gmail.com>
>>> wrote:
>>> > The sympy function (the output of printing the expression) is:
>>> > "t*x*y + x**2 + y**2 + Piecewise((0, x < 0.5), (1, x >= 0.5)) + cos(t)
>>> > - 1"
>>> >
>>> > The error message is:
>>> >
>>> > TypeError: unsupported operand type(s) for |=: 'set' and 'Piecewise'
>>> >
>>> >
>>> > The whole error output is:
>>> >
>>> > Traceback (most recent call last):
>>> > File "integration.py", line 201, in <module>
>>> > print IntegrableFunction(integrands[0],**test).integrate()
>>> > File "integration.py", line 52, in __init__
>>> > sympy_function,self.sympy_variables,args=self.args)
>>> > File "integration.py", line 167, in __init__
>>> > argument_sequence=self.sympy_variables,to_files=True)
>>> > File
>>> >
>>> > "/Users/woodscn/SCIPYTEST/lib/python2.7/site-packages/sympy/utilities/codegen.py",
>>> > line 958, in codegen
>>> > return code_gen.write(routines, prefix, to_files, header, empty)
>>> > File
>>> >
>>> > "/Users/woodscn/SCIPYTEST/lib/python2.7/site-packages/sympy/utilities/codegen.py",
>>> > line 445, in write
>>> > dump_fn(self, routines, f, prefix, header, empty)
>>> > File
>>> >
>>> > "/Users/woodscn/SCIPYTEST/lib/python2.7/site-packages/sympy/utilities/codegen.py",
>>> > line 615, in dump_c
>>> > self.dump_code(routines, f, prefix, header, empty)
>>> > File
>>> >
>>> > "/Users/woodscn/SCIPYTEST/lib/python2.7/site-packages/sympy/utilities/codegen.py",
>>> > line 489, in dump_code
>>> > code_lines.extend(self._call_printer(routine))
>>> > File
>>> >
>>> > "/Users/woodscn/SCIPYTEST/lib/python2.7/site-packages/sympy/utilities/codegen.py",
>>> > line 593, in _call_printer
>>> > constants, not_c, c_expr = ccode(result.expr, assign_to=assign_to,
>>> > human=False)
>>> > File
>>> >
>>> > "/Users/woodscn/SCIPYTEST/lib/python2.7/site-packages/sympy/printing/ccode.py",
>>> > line 262, in ccode
>>> > return CCodePrinter(settings).doprint(expr, assign_to)
>>> > File
>>> >
>>> > "/Users/woodscn/SCIPYTEST/lib/python2.7/site-packages/sympy/printing/ccode.py",
>>> > line 87, in doprint
>>> > code0 = self._doprint_a_piece(expr, assign_to)
>>> > File
>>> >
>>> > "/Users/woodscn/SCIPYTEST/lib/python2.7/site-packages/sympy/printing/codeprinter.py",
>>> > line 30, in _doprint_a_piece
>>> > d = get_contraction_structure(expr)
>>> > File
>>> >
>>> > "/Users/woodscn/SCIPYTEST/lib/python2.7/site-packages/sympy/tensor/index_methods.py",
>>> > line 401, in get_contraction_structure
>>> > result[key] |= d[key]
>>> > TypeError: unsupported operand type(s) for |=: 'set' and 'Piecewise'
>>>
>>>
>>> I see, here is how to reproduce it:
>>> https://gist.github.com/certik/6880300
>>>
>>> This is definitely a bug. Franz, any idea why it would call the tensor
>>> module?
>>>
>>> Ondrej
>>
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