如何删除命令“plt.plot(x,y)”绘制的点

Question

I just want to delete points drawed by command "plt.plot(x,y)" in python package matplotlib.Would you give me some specific commands

            x,y=self.forward(x,y,v,target1)
            print a
            print x,y
            plt.plot(x, y, '*')

Answer 1

You cannot delete points from a line. Three options you have:

• Remove the plot, create new plot

  import matplotlib.pyplot as plt import numpy as np x=np.array([1,3,4,6,7]) y=np.array([2,2,2,2,2]) line, = plt.plot(x, y, '*') #points to keep ind = [True,True,False,False,True] line.remove() newx = x[ind] newy = y[ind] line, = plt.plot(newx, newy, '*') plt.show()

• Update data

  import matplotlib.pyplot as plt import numpy as np x=np.array([1,3,4,6,7]) y=np.array([2,2,2,2,2]) line, = plt.plot(x, y, '*') #points to keep ind = [True,True,False,False,True] newx = x[ind] newy = y[ind] line.set_data(newx, newy) plt.show()

• Mark only subset of points

  import matplotlib.pyplot as plt import numpy as np x=np.array([1,3,4,6,7]) y=np.array([2,2,2,2,2]) line, = plt.plot(x, y, '*') #points to keep ind = [True,True,False,False,True] line.set_markevery(ind) plt.show()

Answer 2

Just like Ernest said: "You cannot delete points from a line".

If you want to do this for some kind of animation, take a look at the animation module

Another highly not recommended hack would be 'paint over' the point with a color equal to the background.

x_del = x[2]
y_del = y[2]
plt.plot(x_del, y_del, '*', color='white')