matplotlib.axes.Axes.axline

Axes.axline(xy1, xy2=None, *, slope=None, **kwargs)[source]

Add an infinitely long straight line.

The line can be defined either by two points xy1 and xy2, or by one point xy1 and a slope.

This draws a straight line "on the screen", regardless of the x and y scales, and is thus also suitable for drawing exponential decays in semilog plots, power laws in loglog plots, etc. However, slope should only be used with linear scales; It has no clear meaning for all other scales, and thus the behavior is undefined. Please specify the line using the points xy1, xy2 for non-linear scales.

The transform keyword argument only applies to the points xy1, xy2. The slope (if given) is always in data coordinates. This can be used e.g. with ax.transAxes for drawing grid lines with a fixed slope.

Parameters:	xy1, xy2(float, float) Points for the line to pass through. Either xy2 or slope has to be given. slopefloat, optional The slope of the line. Either xy2 or slope has to be given.
Returns:	Line2D
Other Parameters:	**kwargs Valid kwargs are Line2D properties Property Description agg_filter a filter function, which takes a (m, n, 3) float array and a dpi value, and returns a (m, n, 3) array alpha scalar or None animated bool antialiased or aa bool clip_box Bbox clip_on bool clip_path Patch or (Path, Transform) or None color or c color contains unknown dash_capstyle CapStyle or {'butt', 'projecting', 'round'} dash_joinstyle JoinStyle or {'miter', 'round', 'bevel'} dashes sequence of floats (on/off ink in points) or (None, None) data (2, N) array or two 1D arrays drawstyle or ds {'default', 'steps', 'steps-pre', 'steps-mid', 'steps-post'}, default: 'default' figure Figure fillstyle {'full', 'left', 'right', 'bottom', 'top', 'none'} gid str in_layout bool label object linestyle or ls {'-', '--', '-.', ':', '', (offset, on-off-seq), ...} linewidth or lw float marker marker style string, Path or MarkerStyle markeredgecolor or mec color markeredgewidth or mew float markerfacecolor or mfc color markerfacecoloralt or mfcalt color markersize or ms float markevery None or int or (int, int) or slice or list[int] or float or (float, float) or list[bool] path_effects AbstractPathEffect picker float or callable[[Artist, Event], tuple[bool, dict]] pickradius float rasterized bool sketch_params (scale: float, length: float, randomness: float) snap bool or None solid_capstyle CapStyle or {'butt', 'projecting', 'round'} solid_joinstyle JoinStyle or {'miter', 'round', 'bevel'} transform matplotlib.transforms.Transform url str visible bool xdata 1D array ydata 1D array zorder float

See also

axhline

for horizontal lines

axvline

for vertical lines

Examples

Draw a thick red line passing through (0, 0) and (1, 1):

>>> axline((0, 0), (1, 1), linewidth=4, color='r')

Examples using matplotlib.axes.Axes.axline

axhspan Demo

Anscombe's quartet