当我在另一列上绘制2列时，会绘制不同的图 [英] When I plot 2 columns one over the other, a different graph is plotted

问题描述

我从2个相同大小的np.arrays中有2列.当我绘制唯一的一个时，我得到以下结果:

I have 2 columns from 2 np.arrays of the same size. When I plot the only the one I get this result:

plt.figure(figsize=(70,10))

for i,h in enumerate(clean_head):
    
    plt.subplot(1,6,i+1)
    #plt.hist(non_fire[:,i],alpha=.3)
    plt.hist(fire[:,i],alpha=.3)
    plt.title(clean_head[i])
    
   # plt.tight_layout()

当我同时绘制它们时，我得到了:

When I plot both I get this:

plt.figure(figsize=(70,10))

for i,h in enumerate(clean_head):
    
    plt.subplot(1,6,i+1)
    plt.hist(non_fire[:,i],alpha=.3)
    plt.hist(fire[:,i],alpha=.3)
    plt.title(clean_head[i])
    
   # plt.tight_layout()

两个直方图中的任何一个都不与首字母相同.我不知道哪个是粉红色的，哪个是浅蓝色的图形.

Where no one of the two histograms is the same with the initial. I dont understand which is the pink and which is the lightblue graph.

我还有16个这样的地块，而我所有地块都有相同的问题.

I have 16 more plots like that and I have the same problem with all of them.

推荐答案

在第二组图中，蓝色直方图用于非开火"情况，橙色直方图用于开火"情况.如果要绘制第三个直方图，它将为绿色.通常，您可以使用参数颜色

in the second set of plots the blue histogram is for the "non-fire"-case and the orange one is for the "fire"-case. If you would plot a third histogram, it would be green. In general you can change the color of a given histogram using the parameter color.

直方图发生变化的原因是数组具有不同的值范围.您可以通过明确为bin提供功能来解决此问题:

The reason why your histograms change is that your arrays have different value ranges. You can fix this by explicitly giving bins the the function:

import matplotlib.pyplot as plt
import numpy as np

a = np.random.rand(100)
b = np.random.rand(100)*2

bins = np.linspace(min(np.min(a), np.min(b)), max(np.max(a), np.max(b)), 10)

plt.figure(figsize=(7,5))
plt.hist(a,alpha=.3, bins=bins)
#plt.hist(b,alpha=.3, bins=bins) #toggle this to see the effect

还请注意，直方图函数会返回其使用的bin列表.

Also note that histogram function returns the list of bins that it uses.

希望有帮助.

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