Re: [eigen] default printing format

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>> +1, to full precision default. To give an example why: I didn't even know
>> streams *had* a precision setting! I suspect if you survey C++ programmers,
> +1 too.
> And i agree, i admint i did not know about .precision() neither....

Full precision is usually excessive for debugging purposes. You'll get
silly matrices like this:

12.3243598603956866 23.397783900968423 4.39399971202043945
2.35459959006778223 3.5969699400049499 -6.2333456797887965

It would be much better just to add a note to the documentation about
the precision settings...

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