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[03. 패키지 - Matplotlib] (5) 3D 그래프(Axes3D)

작성자 : kim2kie

(2023-02-19)

조회수 : 1608

[참조]

 

Matplotlib은 그래프를 그리는 패키지이다.

 

(5) 3D 그래프 
 1) line and scatter
 2) surface
 3) bar3d 

 


 

(5) 3D 그래프 

1) line and scatter

  • Ex)
    import matplotlib.pyplot as plt
    from mpl_toolkits.mplot3d import Axes3D # 3D plot을 위해 필요
    import numpy as np

    # line plot
    fig = plt.figure()
    ax = fig.gca(projection='3d') # Axes3D 객체 생성

    theta = np.linspace(-4*np.pi,4*np.pi,100)
    z = np.linspace(-2,2,100)

    r = z**2+1
    x = r*np.sin(theta)
    y = r*np.cos(theta)

    ax.plot(x,y,z,label='parametric curve')
    ax.scatter(x,y,z)
    ax.legend()

    ax.set_xlabel('X')
    ax.set_ylabel('Y')
    ax.set_zlabel('Z')

    fig.tight_layout()
    plt.show()


     

2) surface

  • Ex)
    import matplotlib.pyplot as plt
    from mpl_toolkits.mplot3d import Axes3D
    import numpy as np

    fig = plt.figure()
    ax = fig.gca(projection='3d') # Axes3D 객체 생성

    X=np.arange(-5,5,0.25)
    Y=np.arange(-5,5,0.25)
    X,Y = np.meshgrid(X,Y) # 격자 grid 생성
    R = np.sqrt(X**2+Y**2)
    Z = np.sin(R)

    surf = ax.plot_surface(X,Y,Z,cmap='coolwarm',lw=0,antialiased=False)
    wire = ax.plot_wireframe(X,Y,Z,color='r',lw=0.1)
    fig.colorbar(surf,shrink=0.5,aspect=5)
    fig.tight_layout()
    plt.show()


     

3) bar3d

  • Ex)
    import matplotlib.pyplot as plt
    from mpl_toolkits.mplot3d import Axes3D
    import numpy as np

    # setup the figure and axes
    fig = plt.figure(figsize=(8, 3))
    ax1 = fig.add_subplot(121, projection='3d') # Axes3D 객체 생성
    ax2 = fig.add_subplot(122, projection='3d')

    # fake data
    _x = np.arange(4)
    _y = np.arange(5)
    _xx, _yy = np.meshgrid(_x, _y) # 격자 grid 생성
    x, y = _xx.ravel(), _yy.ravel() # 다차원 배열을 1차원 배열로 풀기

    top = x + y
    bottom = np.zeros_like(top) # top과 같은 사이즈의 0 배열 생성
    width = depth = 1

    ax1.bar3d(x, y, bottom, width, depth, top, shade=True)
    ax1.set_title('Shaded')

    ax2.bar3d(x, y, bottom, width, depth, top, shade=False)
    ax2.set_title('Not Shaded')

    plt.show()