[Python][Matplotlib] 枠・軸を削除する・目盛りのトゲを削除する（Removing frames, axes and ticks）

目次 Contents

ふつうに図を描く Plot with no options

Matplotlibを使ってふつうに図を描くと

1. 枠・軸が四方に表示される
2. 目盛りにはその位置を示すためのトゲ（tick）が表示される

この二つを消す方法を下で説明する．

When we plot a figure with no options using Matplotlib package,

1. the frame and axes are shown, and
2. the ticks are shown.

Here, I'll explain how to remove the above two parts.

import os.path

import numpy as np
import matplotlib.pyplot as plt


def main():
    x = np.linspace(-3, 3, 100)
    fig, ax = plt.subplots()
    y = (x - 2) * (x + 2) * x
    ax.plot(x, y)

    fig.savefig(os.path.splitext(os.path.basename(__file__))[0] + '.jpg')
    return


if __name__ == '__main__':
    main()

枠・軸を消す Remove the frame and axes

部分的に消す Partially remove the frame and axes

import os.path

import numpy as np
import matplotlib.pyplot as plt


def main():
    x = np.linspace(-3, 3, 100)
    fig, ax = plt.subplots()
    y = (x - 2) * (x + 2) * x
    ax.plot(x, y)

    ax.spines['right'].set_visible(False)
    ax.spines['top'].set_visible(False)
    ax.spines['left'].set_visible(False)

    fig.savefig(os.path.splitext(os.path.basename(__file__))[0] + '.jpg')
    return


if __name__ == '__main__':
    main()

すべて消す Entirely remove the frame and axes

import os.path

import numpy as np
import matplotlib.pyplot as plt


def main():
    x = np.linspace(-3, 3, 100)
    fig, ax = plt.subplots()
    y = (x - 2) * (x + 2) * x
    ax.plot(x, y)

    ax.spines['right'].set_visible(False)
    ax.spines['top'].set_visible(False)
    ax.spines['bottom'].set_visible(False)
    ax.spines['left'].set_visible(False)

    fig.savefig(os.path.splitext(os.path.basename(__file__))[0] + '.jpg')
    return


if __name__ == '__main__':
    main()

目盛りのトゲを消す Remove the ticks

部分的に消す Partially remove the ticks

import os.path

import numpy as np
import matplotlib.pyplot as plt


def main():
    x = np.linspace(-3, 3, 100)
    fig, ax = plt.subplots()
    y = (x - 2) * (x + 2) * x
    ax.plot(x, y)

    ax.spines['right'].set_visible(False)
    ax.spines['top'].set_visible(False)
    ax.spines['bottom'].set_visible(False)
    ax.spines['left'].set_visible(False)
    ax.tick_params('y', length=0, which='major')

    fig.savefig(os.path.splitext(os.path.basename(__file__))[0] + '.jpg')
    return


if __name__ == '__main__':
    main()

すべて消す Entirely remove the ticks

import os.path

import numpy as np
import matplotlib.pyplot as plt


def main():
    x = np.linspace(-3, 3, 100)
    fig, ax = plt.subplots()
    y = (x - 2) * (x + 2) * x
    ax.plot(x, y)

    ax.spines['right'].set_visible(False)
    ax.spines['top'].set_visible(False)
    ax.spines['bottom'].set_visible(False)
    ax.spines['left'].set_visible(False)
    ax.tick_params('x', length=0, which='major')
    ax.tick_params('y', length=0, which='major')

    fig.savefig(os.path.splitext(os.path.basename(__file__))[0] + '.jpg')
    return


if __name__ == '__main__':
    main()