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{SECT 0 {EXCHG {PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT 
-1 18 "load plots package" }}{PARA 0 "> " 0 "" {MPLTEXT 1 0 22 "restar
t;  with(plots):" }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "
" 0 "" {TEXT -1 32 "define the integral curve g(x,y)" }}{PARA 0 "> " 
0 "" {MPLTEXT 1 0 23 "g := (y^3 - x^3)/3 + y;" }}}{EXCHG {PARA 0 "" 0 
"" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 50 "use contourplot to sho
w integral curve:   g(x,y)=1" }}{PARA 0 "> " 0 "" {MPLTEXT 1 0 44 "con
tourplot(g,x=-5..5,y=-5..5,contours=[1]);" }}}}{MARK "3" 0 }{VIEWOPTS 
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