Functions and Variables for implicit_plot
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 -- Function: implicit_plot (EXPR, X_RANGE, Y_RANGE)
 -- Function: implicit_plot ([EXPR_1, ..., EXPR_N], X_RANGE, Y_RANGE)

     Displays a plot of one or more expressions in implicit form. EXPR is the expression to be plotted, X_RANGE the range of the horizontal axis and Y_RANGE the range of vertical axis. implicit_plot only works with the gnuplot driver. implicit_plot respects global setting for the gnuplot driver set by the SET_PLOT_OPTION function. Options can also be passed to implicit_plot function as optional arguments.

     implicit_plot works by tracking sign changes on the area given by X_RANGE and Y_RANGE and can fail for complicated expressions.

     load(implicit_plot) loads this function.

     Example:

          (%i1) implicit_plot (x^2 = y^3 - 3*y + 1, [x, -4, 4], [y, -4, 4],
           [gnuplot_preamble, "set zeroaxis"]);