Hello.
In my program I am having to do this:
PartDerivs [ - ( n + 1 ) : ] = PartDerivs [ - ( n + 1 ) : ] . subs ( {
Ep ( 0 ) : 0, De ( n ) : 0 } )
but this fails saying:
AttributeError: 'list' object has no attribute 'subs'
There is a curious behaviour of Matrix w.r.t slicing:
In [1]: from sy
On Thu, Dec 13, 2012 at 8:55 PM, Shriramana Sharma wrote:
> Hello.
>
> In my program I am having to do this:
>
> PartDerivs [ - ( n + 1 ) : ] = PartDerivs [ - ( n + 1 ) : ] . subs ( {
> Ep ( 0 ) : 0, De ( n ) : 0 } )
>
> but this fails saying:
>
> AttributeError: 'list' object has no attribute 'su
First off, what you are doing would not work, because Matrix slices to
not provide "views" to the Matrix, like numpy arrays. So assigning to
a slice would not work.
I agree that a slice should return a Matrix, though, to be consistant.
In the future, we may implement a view model. This would hel
Something like a view will soon be necessary for my work. This will
probably be in MatrixExprs in a few months.
On Thu, Dec 13, 2012 at 3:35 PM, Aaron Meurer wrote:
> First off, what you are doing would not work, because Matrix slices to
> not provide "views" to the Matrix, like numpy arrays.
On Friday, December 14, 2012 3:20:26 AM UTC+5:45, Aaron Meurer wrote:
>
> First off, what you are doing would not work, because Matrix slices to
> not provide "views" to the Matrix, like numpy arrays. So assigning to
> a slice would not work.
>
>
If you mean that modifying a slice doesn't mod
On Fri, Dec 14, 2012 at 3:05 AM, Aaron Meurer wrote:
>
> I agree that a slice should return a Matrix, though, to be consistant.
Hi and thanks people for your replies.
It is good to know that there is a workaround by using index by tuple
(i.e. [5,:] or [5:,:]) notation for now, but I also would e
On Fri, Dec 14, 2012 at 8:58 PM, Shriramana Sharma wrote:
> On Fri, Dec 14, 2012 at 3:05 AM, Aaron Meurer wrote:
> >
> > I agree that a slice should return a Matrix, though, to be consistant.
>
> Hi and thanks people for your replies.
>
> It is good to know that there is a workaround by using ind
On Fri, Dec 14, 2012 at 8:13 AM, Shriramana Sharma wrote:
> On Fri, Dec 14, 2012 at 3:05 AM, Aaron Meurer wrote:
>>
>> I agree that a slice should return a Matrix, though, to be consistant.
>
> Hi and thanks people for your replies.
>
> It is good to know that there is a workaround by using index
Ah, OK. I didn't realize that that worked. Still, in a true view,
any mutable operation would apply to the given slice in place.
Aaron Meurer
On Thu, Dec 13, 2012 at 9:05 PM, smichr wrote:
>
>
> On Friday, December 14, 2012 3:20:26 AM UTC+5:45, Aaron Meurer wrote:
>>
>> First off, what you are
Le 14/12/2012 15:13, Shriramana Sharma a écrit :
How about this -- it doesn't seem as if Matrix has any operator() i.e. __call__:
from sympy import Matrix
a=Matrix(2,2,(1,2,3,4))
a(1,1)
Traceback (most recent call last):
File "", line 1, in
TypeError: 'MutableMatrix' object is not callabl
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