Plotting local max-min-points ?

[lvl107]

Hello Everyone.

From :

Plotting local max-min-points ?

Thanks in advance.

Regards.

[ValeryOchkov]

[AlanStevens · Accepted solution]

One possibility as follows:

Alan

[lvl107]

After got hints :

A way to eliminate the 'oval' ?

Regards.

Loi.

[lvl107]

So far I propose one of solution : ( and any other idea would be appreciated )