On Friday, February 5, 2016 at 9:43:38 AM UTC-5, Nathann Cohen wrote:
>
> Hello everybody, 
>
> I am writing here to share an inconsistency with the behaviour of 
> Matrix.plot: 
>
> When M is sparse: 
>     M.plot() shows which entries of M are nonzero. 
>
> When M is dense: 
>     M.plot() shows M with colors representing the value of each cell. 
>
>
>

To get back to the original issue, this has been the case for many years - 
I guess implemented in http://trac.sagemath.org/ticket/6554 ?  See there 
for the original design decision rationale - unless it was even earlier... 
 I don't have an opinion on this but people who want sparse matrices to 
stay sparse may.  
 

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