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{SECT 0 {EXCHG {PARA 256 "" 0 "" {TEXT -1 8 "Surfaces" }}{PARA 0 "" 0 
"" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 41 "The cell below illustr
ates how the Maple " }{TEXT 256 6 "plot3d" }{TEXT -1 53 " procedure ca
n be used to study functions of the form" }}{PARA 0 "" 0 "" {TEXT -1 
0 "" }}{PARA 257 "" 0 "" {TEXT 257 10 "z = f(x, y" }{TEXT -1 1 ")" }}
{PARA 0 "" 0 "" {TEXT -1 1 " " }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 
0 107 "plot3d(exp(-(x^2 + y^2)), x=-2..2, y=-2..2, axes=boxed);\n\nplo
t3d(x^2 + y^2, x=-2..2, y=-2..2, axes=boxed);\n" }}}{EXCHG {PARA 0 "" 
0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 50 "The cell below intro
duces several options for the " }{TEXT 258 6 "plot3d" }{TEXT -1 57 " p
rocedure that can help understand functions of the form" }}{PARA 0 "" 
0 "" {TEXT -1 0 "" }}{PARA 258 "" 0 "" {TEXT -1 11 "z = f(x, y)" }}
{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 49 "The most \+
dramatic of these options is the option " }{TEXT 259 23 "color=exp(-(x
^2 + y^2))" }{TEXT -1 54 "  that colors each patch on the surface by i
ts height." }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}}{EXCHG {PARA 0 "> " 0 "
" {MPLTEXT 1 0 129 "plot3d(exp(-(x^2 + y^2)), x=-2..2, y=-2..2, \n    \+
   color=exp(-(x^2+y^2)), style=patchnogrid,\n       grid =[50, 50], a
xes=boxed);" }}}}{MARK "2 5 2" 54 }{VIEWOPTS 1 1 0 1 1 1803 }