Graphing max function - unexpected behavior
My minimal working example is:
(x,y) = var('x y')
def f(x,y):
return max(abs(x),abs(y))
table([[f(x,y) for y in range(-3,4)] for x in range(-3,4)])
The output is this table:
3 3 3 3 3 3 3
3 2 2 2 2 2 3
3 2 1 1 1 2 3
3 2 1 0 1 2 3
3 2 1 1 1 2 3
3 2 2 2 2 2 3
3 3 3 3 3 3 3
That looks like it ought to. But when I try
contour_plot(f(x,y),(x,-3,3),(y,-3,3))
I get something that looks a lot different. It seems I don't have enough karma to upload the image, but its looks more like the one that would be associated to this table:
table([[f(0,y) for y in range(-3,4)] for x in range(-3,4)])
3 2 1 0 1 2 3
3 2 1 0 1 2 3
3 2 1 0 1 2 3
3 2 1 0 1 2 3
3 2 1 0 1 2 3
3 2 1 0 1 2 3
3 2 1 0 1 2 3
I have the issue isolated in a Sage worksheet on CoCalc. I don't have enough karma to include a link, either.