matplotlib.axes.Axes.fill_between

Axes.fill_between(self, x, y1, y2=0, where=None, interpolate=False, step=None, *, data=None, **kwargs) [source]

Fill the area between two horizontal curves.

The curves are defined by the points (x, y1) and (x, y2). This creates one or multiple polygons describing the filled area.

You may exclude some horizontal sections from filling using where.

By default, the edges connect the given points directly. Use step if the filling should be a step function, i.e. constant in between x.

Parameters:	xarray (length N) The x coordinates of the nodes defining the curves. y1array (length N) or scalar The y coordinates of the nodes defining the first curve. y2array (length N) or scalar, default: 0 The y coordinates of the nodes defining the second curve. wherearray of bool (length N), optional Define where to exclude some horizontal regions from being filled. The filled regions are defined by the coordinates x[where]. More precisely, fill between x[i] and x[i+1] if where[i] and where[i+1]. Note that this definition implies that an isolated True value between two False values in where will not result in filling. Both sides of the True position remain unfilled due to the adjacent False values. interpolatebool, default: False This option is only relevant if where is used and the two curves are crossing each other. Semantically, where is often used for y1 > y2 or similar. By default, the nodes of the polygon defining the filled region will only be placed at the positions in the x array. Such a polygon cannot describe the above semantics close to the intersection. The x-sections containing the intersection are simply clipped. Setting interpolate to True will calculate the actual intersection point and extend the filled region up to this point. step{'pre', 'post', 'mid'}, optional Define step if the filling should be a step function, i.e. constant in between x. The value determines where the step will occur: 'pre': The y value is continued constantly to the left from every x position, i.e. the interval (x[i-1], x[i]] has the value y[i]. 'post': The y value is continued constantly to the right from every x position, i.e. the interval [x[i], x[i+1]) has the value y[i]. 'mid': Steps occur half-way between the x positions.
Returns:	PolyCollection A PolyCollection containing the plotted polygons.
Other Parameters:	**kwargs All other keyword arguments are passed on to PolyCollection. They control the Polygon 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 float or None animated bool antialiased or aa or antialiaseds bool or list of bools array ndarray capstyle {'butt', 'round', 'projecting'} clim (vmin: float, vmax: float) clip_box Bbox clip_on bool clip_path Patch or (Path, Transform) or None cmap Colormap or str or None color color or list of rgba tuples contains unknown edgecolor or ec or edgecolors color or list of colors or 'face' facecolor or facecolors or fc color or list of colors figure Figure gid str hatch {'/', '\', '|', '-', '+', 'x', 'o', 'O', '.', '*'} in_layout bool joinstyle {'miter', 'round', 'bevel'} label object linestyle or dashes or linestyles or ls str or tuple or list thereof linewidth or linewidths or lw float or list of floats norm Normalize or None offset_position unknown offsets array-like (N, 2) or (2,) path_effects AbstractPathEffect picker None or bool or callable pickradius unknown rasterized bool or None sketch_params (scale: float, length: float, randomness: float) snap bool or None transform Transform url str urls list of str or None visible bool zorder float

See also

fill_between

Fill between two sets of y-values.

fill_betweenx

Fill between two sets of x-values.

Notes

Note

In addition to the above described arguments, this function can take a data keyword argument. If such a data argument is given, the following arguments can also be string s, which is interpreted as data[s] (unless this raises an exception): x, y1, y2, where.

Objects passed as data must support item access (data[s]) and membership test (s in data).

Examples using matplotlib.axes.Axes.fill_between