Python プロット・可視化 matplotlib fill_fill と fill_between

xxx'

xx //Write it like this and you're good to go

def wave_curve():
    n=256
    X=np.linspace(-np.pi,np.pi,n,endpoint=True)
    Y=np.sin(2*X)

    plt.plot(X,Y+1,color='blue',alpha=0.5)
    plt.fill_between(X,1,Y+1,color='blue',alpha=.25)# fill the area between two functions, in this case fill (the area between 0 and Y+1)
    # plt.fill(Y,X,color='blue')

    plt.plot(X,Y-1,color='gray',alpha=0.6)
    plt.fill_between(X,-1,Y-1,where=-1>Y-1,color='blue',alpha=.6)
    plt.fill_between(X,-1,Y-1,where=-1<Y+1,color='red',alpha=.7)
    
    plt.xlim(-np.pi,np.pi)
    plt.xticks([])#Null does not show coordinates
    plt.ylim(-2.0,2.0)
    plt.yticks([])
    
    plt.show()