음함수 3d

from mpl_toolkits.mplot3d import axes3d
import matplotlib.pyplot as plt
import numpy as np

def plot_implicit(fn, bbox=(-5,5)):
    ''' create a plot of an implicit function
    fn  ...implicit function (plot where fn==0)
    bbox ..the x,y,and z limits of plotted interval'''
    xmin, xmax, ymin, ymax, zmin, zmax = bbox*3
    fig = plt.figure()
    ax = fig.add_subplot(111, projection='3d')
    A = np.linspace(xmin, xmax, 100) # resolution of the contour
    B = np.linspace(xmin, xmax, 50) # number of slices
    A1,A2 = np.meshgrid(A,A) # grid on which the contour is plotted

    for z in B: # plot contours in the XY plane
        X,Y = A1,A2
        Z = fn(X,Y,z)
        cset = ax.contour(X, Y, Z+z, [z], zdir='z')
        # [z] defines the only level to plot for this contour for this value of z

    for y in B: # plot contours in the XZ plane
        X,Z = A1,A2
        Y = fn(X,y,Z)
        cset = ax.contour(X, Y+y, Z, [y], zdir='y')

    for x in B: # plot contours in the YZ plane
        Y,Z = A1,A2
        X = fn(x,Y,Z)
        cset = ax.contour(X+x, Y, Z, [x], zdir='x')

    # must set plot limits because the contour will likely extend
    # way beyond the displayed level.  Otherwise matplotlib extends the plot limits
    # to encompass all values in the contour.
    ax.set_zlim3d(zmin,zmax)
    ax.set_xlim3d(xmin,xmax)
    ax.set_ylim3d(ymin,ymax)

    plt.show()

def goursat_tangle(x,y,z):
    a,b,c = 0.0,-5.0,11.8
    return x**4+y**4+z**4+a*(x**2+y**2+z**2)**2+b*(x**2+y**2+z**2)+c

def test(x,y,z):
    return (z-x**2 -y**2)*(z-4)

plot_implicit(test)

meshgrid 사용

import numpy as np
delta = 1
x = np.arange(0, 4, delta)
y = np.arange(0, 4, delta)

X, Y = np.meshgrid(x, y)
print(x)
print(X)
print(Y)


[0 1 2 3]
[[0 1 2 3]
[0 1 2 3]
[0 1 2 3]
[0 1 2 3]]
[[0 0 0 0]
[1 1 1 1]
[2 2 2 2]
[3 3 3 3]]

마진겹침 현상


결과물


글사이에 20px의 margin을 둔 예제

생활코딩 1

생활코딩 2

마진겹침이 일어나는 현상

생활코딩 3


<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="desc" content="생활코딩의 소개자료">
    <title>Title</title>
    <style type="text/css">
        body{border:1px solid blue;}
        p {
            margin:20px;
            border:1px solid red;
        }

    </style>
</head>
<body>
글사이에 20px의 margin을 둔 예제

<p> 생활코딩 1 </p>
<p> 생활코딩 2 </p>
마진겹침이 일어나는 현상
<p> 생활코딩 3 </p>

</body>
</html>