Re: [eigen] matrix exponential with c++0x

[Hauke Heibel <hauke.heibel@xxxxxxxxxxxxxx>]

Two things...

First, I wonder whether it is important to rename the tempalte parameters of NumericalDiff? Did they lead to a compilation error too?

Second, I think we (might) need a comment from Mark whether M_PIl is really required.

I think defining M_PIl as what is usually defined as M_PI is not a good solution - ok, its just a unit test but anyways.

If we really need M_PIl then we might do

#if !define(M_PIl)
#define M_PIl 3.1415926535897932384626433832795029L
#endif

Cheers,
Hauke

2009/12/2 Björn Piltz <bjornpiltz@xxxxxxxxxxxxxx>

M_LOG2_E and M_PI (much less M_PIl) have never been defined in MSVC's stl afaik.

pow() has also been problematic since pow(double/float, int) wasn't defined in earlier versions, making "pow(2.0, 2)" not compile.

Right now some tests in unsupported don't compile. I'm attaching a patch.

2009/11/30 Benoit Jacob <jacob.benoit.1@xxxxxxxxx>

2009/11/30 Hauke Heibel <hauke.heibel@xxxxxxxxxxxxxx>:

> On Mon, Nov 30, 2009 at 2:37 PM, mmoll <Markus.Moll@xxxxxxxxxxxxxxxx> wrote:
>>
>> Hi
>>
>> Quoting Hauke Heibel <hauke.heibel@xxxxxxxxxxxxxx>:
>>
>> > First, M_LOG2_E suddenly was not defined anymore so I added
>> >
>> > #if defined(log2) && !defined(M_LOG2_E)
>> >   #define M_LOG2_E 0.693147180559945309417
>> > #endif
>>
>> As far as I know, M_LOG2_E was never standard? (not mentioned in C++98
>> or C99)
>
> Can you cite the exact draft and versions you have been looking at? I cannot
> even find M_PI.
>
> I was just looking since I found M_PIl (the last letter is an L for long) in
> one of our tests and as with M_LOG2_E it is not defined over here...

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