在python中使用滑块进行散点图 [英] Scatter plot with a slider in python

问题描述

嘿，我正在尝试使用一个滑块创建散点图，该滑块会在我滑过时更新该图.到目前为止，这是我的代码.它绘制了一个散点图和一个滑块，但是当我四处移动时，什么也没有发生.我怀疑问题出在 .set_ydata 位，但在Internet上我似乎找不到解决方法.

Hey I am trying to create a scatter plot with a slider that updates the plot as I slide across. This is my code so far. It draws a scatter plot and a slider but as I move it around, nothing happens. I suspect that the problem is with the .set_ydatabit but I can't seem to find how to do it otherwise on the Internet.

import numpy as np 
from matplotlib.widgets import Slider
from pylab import plot, show, figure, scatter, axes, draw

fig = figure()
ax = fig.add_subplot(111)

x, y = np.random.rand(2,100)
scat = scatter(x,y)

axcolor = 'lightgoldenrodyellow'
axamp = axes([0.2, 0.01, 0.65, 0.03], axisbg=axcolor)

scorr = Slider(axamp, 'corr', -2,2, valinit=1)

def update(val):
    corr = scorr.val

    for i in range(len(x)):
        x[i]=x[i]+corr*np.random.randn()

    for i in range(len(y)):
        y[i]=y[i]+corr*np.random.randn()

    scat.set_xdata(x)
    scat.set_ydata(y)
    draw()

scorr.on_changed(update)

show(scat)

这只是一个公平的测试脚本.我必须使用更复杂的脚本来做同样的事情，但意识到在一个更简单的问题上尝试起来会更容易.我真的只是在乎 scat.set_ydata 以及放置在其中的内容，以便它起作用.

This is just a test script in fairness. I have to do the same thing with a much more complicated script but realized it would be easier to try it out on a simpler problem. I really just care about scat.set_ydata and what to put there instead so that it works.

谢谢.

推荐答案

您需要改为使用 set_offsets 和 set_array :

# make sure you get the right dimensions and direction of arrays here
xx = np.vstack ((x, y))
scat.set_offsets (xx.T)

# set colors
scat.set_array (y)

可能与以下内容重复:如何为散点图设置动画?

Probably duplicate of: How to animate a scatter plot?

这篇关于在python中使用滑块进行散点图的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！