Hello,
I've just had a program hit the following assert on line 134 of StableNorm.h:

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eigen_assert(false && "overflow");

Is this supposed to be there? Line 135 is:

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return rbig;

Which suggests to me the algorithm is supposed to return a value even in the case of overflow, and the assert is stopping this from happening. I had never heard of Blue's algorithm before today, so don't know what the correct behaviour is. For reference, blueNorm() was called from line 221 of LevenbergMarquardt.h (in the Non-linear optimisers unsupported module).

For the time being I have commented out the assert with apparently no ill effect (famous last words).

You're right, fixed:

https://bitbucket.org/eigen/eigen/chang ... 45a2f4b76/
changeset: 17345a2f4b76
user: ggael
date: 2012-09-07 23:19:24
summary: remove stupid assert in blue norm.