I see your point. But in that case, would the API remain the same? What you
suggest, would involve either-
A. modifying the code for trigsimp itself
or
B. having a 'trigsimp' method in Vector itself (already done this)
On Sun, Jun 8, 2014 at 11:26 AM, Matthew Rocklin <mrock...@gmail.com> wrote:
> 1. How do I ensure methods like 'trigsimp' work with these classes?
> Currently, passing a vector like *(sin(a)+cos(a))**2*i - j* to trigsimp
> returns the correct answer mathematically, _but_ the instance is of type
> Add (instead of the expected VectorAdd). How do I prevent this?
>
> I ran into this when I was building MatrixExprs which have the same issues
> (We have a MatrixAdd but wanted to use core SymPy utilities, which use
> Add). For a while I got away with using the core functions and then
> calling "matrixify", which walked through the tree changing all Adds to
> MatrixAdds, etc. if the tree contained any matrices. This worked for a
> while but eventually became too much of a pain. MatrixExprs now avoid
> interacting with Exprs as much as possible. Expr code assume that it deals
> with scalars. This is everywhere in the code.
>
> My suggestion would be to subs out all of your vectors for scalars, call
> trigsimp, subs back the scalars to vectors, then do some sort of
> Add-to-VectorAdd operation. Maybe you can generalize this to any SymPy
> scalar operation.
>
> 2. Regarding bases
>
> I agree with Franz that, if possible, it is good to leverage existing work.
>
>
> On Fri, Jun 6, 2014 at 8:40 AM, F. B. <franz.bona...@gmail.com> wrote:
>
>>
>>
>> On Friday, June 6, 2014 3:44:51 PM UTC+2, Sachin Joglekar wrote:
>>>
>>>
>>> 1. How do I ensure methods like 'trigsimp' work with these classes?
>>> Currently, passing a vector like *(sin(a)+cos(a))**2*i - j* to trigsimp
>>> returns the correct answer mathematically, _but_ the instance is of type
>>> Add (instead of the expected VectorAdd). How do I prevent this?
>>>
>>>
>> Maybe this is a bug. I would look for the place where the Add object is
>> constructed. Maybe it's a bug in your code, maybe it's a bug in trigsimp.
>>
>>
>>
>>> 2. How do I get 'solve' to work with these classes? For example,
>>> consider a problem solved (in the future) using the module -
>>>
>>> *Do the following vectors form a basis for R^3: {(2,-3,1), (4,1,1),
>>> (0,-7,1)}?*
>>>
>>
>> Why don't use matrix determinant?
>>
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