![]() The blue lines are lowest and the red ones are highest.Ĥ. In this mode, you are looking at the 3D graph from above and the colored lines represent equal heights (it's just like a contour map in geography). You can enter your own function of x and y using simple math expressions (see below the graph for acceptable syntax).ģ. Choose any of the pre-set 3D graphs using the drop down box at the top.Ģ. You can also toggle between 3D Grapher mode and Contour mode. You can use the following applet to explore 3D graphs and even create your own, using variables x and y. The first example we see below is the graph of z = sin( x) + sin( y). That is, the z-value is found by substituting in both an x-value and a y-value. ![]() A graph in 3 dimensions is written in general: z = f( x, y).
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