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# 59. implicit_plot

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## 59.1 Functions and Variables for implicit_plot

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` 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"]);

  ·

  @ref{Category: Plotting} · @ref{Category: Share packages} · @ref{Category: Package implicit_plot}

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