matplotlib.axes.Axes.axhline

Axes.axhline(y=0, xmin=0, xmax=1, **kwargs)[source]

Add a horizontal line across the axis.

Parameters:	yfloat, default: 0 y position in data coordinates of the horizontal line. xminfloat, default: 0 Should be between 0 and 1, 0 being the far left of the plot, 1 the far right of the plot. xmaxfloat, default: 1 Should be between 0 and 1, 0 being the far left of the plot, 1 the far right of the plot.
Returns:	Line2D
Other Parameters:	**kwargs Valid keyword arguments are Line2D properties, with the exception of 'transform': 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

hlines

Add horizontal lines in data coordinates.

axhspan

Add a horizontal span (rectangle) across the axis.

axline

Add a line with an arbitrary slope.

Examples

• draw a thick red hline at 'y' = 0 that spans the xrange:

  >>> axhline(linewidth=4, color='r')
  

• draw a default hline at 'y' = 1 that spans the xrange:

  >>> axhline(y=1)
  

• draw a default hline at 'y' = .5 that spans the middle half of the xrange:

  >>> axhline(y=.5, xmin=0.25, xmax=0.75)
  

Examples using matplotlib.axes.Axes.axhline