SVD with eigen 2.0.7

SVD with eigen 2.0.7

Fri Oct 23, 2009 7:40 pm

I work with 2.0.5 and today I try to update to 2.0.7

The following code work with eigen 2.0.5 and fail with eigen 2.0.7

SVD<MatrixXd> m_matSVD;

At compilation I receive:

error C2512: 'Eigen::SVD<MatrixType>' : no appropriate default constructor available
1> with
1> [
1> MatrixType=Eigen::MatrixXd
1> ]

I try with Visual Studio C++ express 8.0
and with Visual Studio professionnal C++ 8.0 the student version.

Same error on each compiler.

I work with 2.0.5 and today I try to update to 2.0.7

The following code work with eigen 2.0.5 and fail with eigen 2.0.7

SVD<MatrixXd> m_matSVD;

At compilation I receive:

error C2512: 'Eigen::SVD<MatrixType>' : no appropriate default constructor available
1> with
1> [
1> MatrixType=Eigen::MatrixXd
1> ]

I try with Visual Studio C++ express 8.0
and with Visual Studio professionnal C++ 8.0 the student version.

Same error on each compiler.

[bjacob]

Re: SVD with eigen 2.0.7

Fri Oct 23, 2009 9:39 pm

This is very surprising: the only difference in SVD between 2.0.5 and 2.0.7 is that this assert was added at line 110 in the compute() method:

Code: Select all

ei_assert(m>=n && "In Eigen 2.0, SVD only works for MxN matrices with M>=N. Sorry!");


By the way, in Eigen 2.0 (2.0.5 and 2.0.7), we didn't write a default ctor for SVD so it can only be using a compiler-generated one.

Try this:
* remove the assert. Does it make a difference? If yes, can you explain that? I'd be puzzled.
* add a trivial default ctor, just SVD() {}. Does it help? If yes, we sure can include that code.

This is very surprising: the only difference in SVD between 2.0.5 and 2.0.7 is that this assert was added at line 110 in the compute() method:

[code]
ei_assert(m>=n && "In Eigen 2.0, SVD only works for MxN matrices with M>=N. Sorry!");
[/code]

By the way, in Eigen 2.0 (2.0.5 and 2.0.7), we didn't write a default ctor for SVD so it can only be using a compiler-generated one.

Try this:
* remove the assert. Does it make a difference? If yes, can you explain that? I'd be puzzled.
* add a trivial default ctor, just SVD() {}. Does it help? If yes, we sure can include that code.

[bjacob]

Re: SVD with eigen 2.0.7  

Fri Oct 23, 2009 10:07 pm

Can you try the 2.0 branch, i've added a default ctor.

If it works for you, i release 208 now (there's another major bug too)

Can you try the 2.0 branch, i've added a default ctor.

If it works for you, i release 208 now (there's another major bug too)

Re: SVD with eigen 2.0.7

Mon Oct 26, 2009 10:58 pm

Thank's for help. All build is ok with the add of SVD() {}.

And eigen 2_0_9 is ok with first tests.

Thank's for help. All build is ok with the add of SVD() {}.

And eigen 2_0_9 is ok with first tests.