There isn't enough here to tell what's going on. Can you show us the code?

> On Sep 19, 2016, at 6:53 PM, Gopalakrishnan, Krishnakumar 
> <krishnaku...@imperial.ac.uk> wrote:
> 
> Hi Dan,
> 
> Thanks for your suggestion to use the ResidualTerm as per your gist posting 
> https://gist.github.com/guyer/f29c759fd7f0f01363b8483c7bc644cb  of the 
> Newton's method.
> 
> When I try to implement the Newton's method into my code, python interpreter 
> gives the following error message
> 
> TypeError: __init__() got an unexpected keyword argument 'var' 
> File " \fipy-3.1-py2.7.egg\fipy\terms\term.py", line 428, in __eq__
>    return self - other
>  File "\fipy-3.1-py2.7.egg\fipy\terms\term.py", line 422, in __sub__
>    return self + (-other)
>  File "\fipy-3.1-py2.7.egg\fipy\terms\abstractBinaryTerm.py", line 88, in 
> __neg__
>    return (-self.term) + (-self.other)
>  File "\fipy-3.1-py2.7.egg\fipy\terms\nonDiffusionTerm.py", line 56, in 
> __neg__
>    return self.__class__(coeff=-self.coeff, var=self.var)
> TypeError: __init__() got an unexpected keyword argument 'var'
> 
> I am following exactly the same steps given in the original gist posting. Any 
> idea what might be wrong here ?
> 
> 
> Krishna 
> 
> 
> 
> -----Original Message-----
> From: fipy-boun...@nist.gov [mailto:fipy-boun...@nist.gov] On Behalf Of 
> Daniel Wheeler
> Sent: Tuesday, September 6, 2016 1:46 PM
> To: Multiple recipients of list <fipy@nist.gov>
> Subject: Re: Dynamic under-relaxation factors for FiPy sweep
> 
> On Tue, Sep 6, 2016 at 6:58 AM, Krishna <krishnaku...@imperial.ac.uk> wrote:
>> 
>> Since python to be a very distributed ecosystem, this question for 
>> some kind of a starter code,  may not fit well in  a 
>> general/computational math stackexchange post , nor in this mailing 
>> list. fipy's details are certainly required to implement an Aitken 
>> type dynamic under relaxation. , I.e. one needs access to the internal 
>> and residual matrices, in order to apply text book formulae, and then 
>> split the relaxation vectors into individual scalars for use in the 
>> 'underrelaxation' parameter for each sweep method. The first two 
>> sweeps must be static/initial 'underrelaxation' so that we can apply the 
>> formula.
> 
> I see. Here is an example of doing Newton iterations in FiPy
> 
>    https://gist.github.com/guyer/f29c759fd7f0f01363b8483c7bc644cb
> 
> It uses the ResidualTerm. If you look at that code, it uses the 
> justResidualVector, which gives the residual vector. You can also get access 
> to the matrix and b vector separately. For the under relaxation, I don't 
> think it's possible to apply it as a vector that's different for each 
> equation. There is probably some way to do it akin to what's happening in the 
> ResidualTerm.
> 
> 
> 
> --
> Daniel Wheeler
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