Works for me:

sage: m.rank()
80

On Thursday, April 11, 2013 9:29:34 PM UTC+1, Sure wrote:
>
> About ATLAS: afaik it is a floating point library, but my matrix is 
> rational, can it depend on ATLAS? Maybe people with correct settings would 
> check, if the bug happens in their sage. 
>

Suprisingly enough, the rank computation goes rational -> integer -> finite 
field -> floating point.

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