Re: [eigen] unpleasant surprise mit math functions

[rupp@xxxxxxxxxxxxxxxx]

Hi Helmut,

just out of curiosity:
which unified behavior do you expect for exp(A), sin(A) and cos(A),  
with A being a dense matrix? If you want it to act on each entry  
separately, then the result of exp(A) is probably not what a  
significant number of people may expect. However, using a power series  
expansion for exp, sin and cos is clearly not equivalent to  
sin(t.array())...

Best regards,
Karli


Quoting Helmut Jarausch <jarausch@xxxxxxxxxxxxxxxxxxx>:

> On 09/22/2012 10:21:11 PM, Gael Guennebaud wrote:
> > Hi,
> >
> > there is indeed something very strange happening. I've no idea why
> > sin(t) with t a VectorXd does compile.
>
> Hi,
>
> what rational forces one to disallow sin(t) for t beeing a DenseMatrix
> object?
> Couldn't it be defined resorting to  sin(t.array()) internally?
>
> Thanks,
> Helmut.