Recently I was trying to get SageMath to plot something:

plot3d(floor(min(x,y)),(x,1,7),(y,1,7))

The result looks like this:

I checked, and it does seem that both floor(min(7,1)) and floor(min(1,7)) are equal to 1, as they should be. But that's not what the plot shows. Any explanations of what is happening?

Thanks,

Fernando


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=============================================================
Fernando Q. Gouveahttp://www.colby.edu/~fqgouvea
Carter Professor of Mathematics
Dept. of Mathematics
Colby College
5836 Mayflower Hill
Waterville, ME 04901

Time is nature's way of making sure that everything doesn't happen at once.

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