Using the function Show, you can combine the contour plot with a regular plot of sin( x): Instead of manually drawing the line representing x = π, you can use ContourPlot to visualize the relation: The Epilog option can include any combination of Mathematica‘s graphics directives, such as colors and dashing: Here’s a version with multiple dashed grid lines:Īnother way to get the vertical line x = π is to explicitly tell Plot to draw the line after it finishes plotting. You can also use GridLinesStyle to specify colors and styles. The setting GridLines → draws grid lines at the specified lists of points on the x– and y-axes. Any arrangement of horizontal and vertical lines can be produced using the GridLines option: The particular relation x = π is a single vertical line. There are a few different ways to combine a regular plot of a function with a visualization of a relation. You can plot two or more functions together by giving a list as the first argument of a function like Plot:īut a relation like x = π is not a function, since it doesn’t define a single function value for each x.

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