How to fill an area in matplotlib ?

Few examples of how to fill an area with matplotlib using Axes.fill_between:

Fill between a curve and the x axis:

````import matplotlib.pyplot as plt`
`import numpy as np`

`def f(x):`
`    return x**2`

`x = np.arange(0,10,0.1)`
`y = f(x)`

`plt.plot(x,y,'k--')`

`plt.fill_between(x, y, color='#539ecd')`

`plt.grid()`

`plt.title('How to fill an area in matplotlib ?',fontsize=10)`

`plt.savefig('how_to_fill_area_matplotlib_01.png', bbox_inches='tight')`
`#plt.show()`
`plt.close()`
```

Fill the opposite area:

````def f(x):`
`    return x**2`

`x = np.arange(0,10,0.1)`
`y = f(x)`

`plt.plot(x,y,'k--')`

`plt.fill_between(x, y, np.max(y), color='#539ecd')`

`plt.grid()`

`plt.title('How to fill an area in matplotlib ?',fontsize=10)`

`plt.savefig('how_to_fill_area_matplotlib_02.png', bbox_inches='tight')`
`#plt.show()`
`plt.close()`
```

Fill between two curves:

````def f1(x):`
`    return 1.0 / np.exp(x)`

`def f2(x):`
`    return np.log(x)`

`x = np.arange(0.01,10,0.1)`

`y1 = f1(x)`
`y2 = f2(x)`

`plt.plot(x,y1,'k--')`
`plt.plot(x,y2,'k--')`

`plt.fill_between(x, y1, y2, color='#539ecd')`

`plt.grid()`

`plt.xlim(0,10)`
`plt.ylim(-1,2.5)`

`plt.title('How to fill an area in matplotlib ?',fontsize=10)`

`plt.savefig('how_to_fill_area_matplotlib_03.png', bbox_inches='tight')`
`#plt.show()`
`plt.close()`
```

Fill between two curves using a condition:

````def f1(x):`
`    return 1.0 / np.exp(x)`

`def f2(x):`
`    return np.log(x)`

`x = np.arange(0.01,10,0.1)`

`y1 = f1(x)`
`y2 = f2(x)`

`plt.plot(x,y1,'k--')`
`plt.plot(x,y2,'k--')`

`plt.fill_between(x, y1, y2, where=y1<y2, color='#539ecd')`

`plt.grid()`

`plt.xlim(0,10)`
`plt.ylim(-1,2.5)`
`plt.title('How to fill an area in matplotlib ?',fontsize=10)`

`plt.savefig('how_to_fill_area_matplotlib_04.png', bbox_inches='tight')`
`#plt.show()`
`plt.close()`
```

Other examples:

````x = np.arange(0.01,10,0.1)`

`y1 = x`
`y2 = - x + np.max(y1)`

`y = np.minimum(y1,y2)`

`plt.plot(x,y1,'k--')`
`plt.plot(x,y2,'k--')`

`plt.fill_between(x, y, color='#539ecd')`

`plt.grid()`

`plt.title('How to fill an area in matplotlib ?',fontsize=10)`

`plt.savefig('how_to_fill_area_matplotlib_05.png', bbox_inches='tight')`
`#plt.show()`
`plt.close()`
```

````x = [0,1,2,3,4,5]`
`y = [0,1,2,3,4,5]`

`plt.plot(x,y,'k--')`

`plt.fill_between(x, y, color='#539ecd')`

`plt.grid()`

`plt.title('How to fill an area in matplotlib ?',fontsize=10)`

`plt.savefig('how_to_fill_area_matplotlib_06.png', bbox_inches='tight')`
`#plt.show()`
`plt.close()`
```

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