- #1

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## Main Question or Discussion Point

> f:=(x,y)->(x+3*y -1)*e^(-(x^2)-(y^2));

> plot3d(f(x,y),x=-3..3,y=-3..3);

I'm supposed to plot for -3 less than or equal to x,y less than or equal to 3... Does that mean x=y at a given point? Anyway, I rewrote it as above and Maple does not show an error but rather shows just a blank space where the graph is supposed to be. Any suggestions?

> plot3d(f(x,y),x=-3..3,y=-3..3);

I'm supposed to plot for -3 less than or equal to x,y less than or equal to 3... Does that mean x=y at a given point? Anyway, I rewrote it as above and Maple does not show an error but rather shows just a blank space where the graph is supposed to be. Any suggestions?