I've found the following bug:
if a function z(x,y) is used inside an eval command the mesh of the function is incomplete.

Try with: eval(z(x,y)) where z(x,y)=x^2+y^2

See attached file.

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Hello,

Wrote

(I have an image to explain what I wonat to say, but I do not know how to insert a figure below).

See this attached pictures please. You can attach-upload one of more pictures or files after posting (upper picture), or before posting (lower picture).

Regards,
Radovan

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Thank you for your suggestion.

Now a picture is attached to my post

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