Hello,

I'm using CCodeGen from sympy.utilities.codegen, and it's working great. 
I'd like to make all the arguments of a given expression InOutArguments, so 
that they are passed by reference in the corresponding C code. I haven't 
quite been able to figure this out by reading the documentation. A code 
snippit as it stands goes like:

# Make mass matrix.
mass_matrix = N.T * N
mass_matrix_C = CCodeGen(project='mass_matrix')
routines = []
for x in range(order+1):
    for y in range(order+1):


        name = 'mm_%d%d' % (x, y)
        routines.append(mass_matrix_C.routine(
            name, mass_matrix[x,y], argument_sequence=None))            
        
mass_matrix_C.write(routines, 'mass_matrix', to_files=True)
exit()

Is there something I can modify here? 

Thanks for any help!

Mike.

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