python怎么用matplotlib画柱状图

Python——使用matplotlib绘制柱状图

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1、基本柱状图

首先要安装matplotlib 可以使用pip命令直接安装

[python] view plain copy

# -*- coding: utf-8 -*-

import matplotlib.pyplot as plt

num_list = [1.5,0.6,7.8,6]

plt.bar(range(len(num_list)), num_list)

plt.show()

2、设置颜色

[python] view plain copy

# -*- coding: utf-8 -*-

import matplotlib.pyplot as plt

num_list = [1.5,0.6,7.8,6]

plt.bar(range(len(num_list)), num_list,fc='r')

plt.show()

[cpp] view plain copy

# -*- coding: utf-8 -*-

import matplotlib.pyplot as plt

num_list = [1.5,0.6,7.8,6]

plt.bar(range(len(num_list)), num_list,color='rgb')

plt.show()

3、设置标签

[python] view plain copy

# -*- coding: utf-8 -*-

import matplotlib.pyplot as plt

name_list = ['Monday','Tuesday','Friday','Sunday']

num_list = [1.5,0.6,7.8,6]

plt.bar(range(len(num_list)), num_list,color='rgb',tick_label=name_list)

plt.show()

4、堆叠柱状图

新手python怎么从Excel中读取多行多列画并列柱状图？

首先，dataframe自带的柱状图，可以将每列作为一个图例

import pandas as pd

data=pd.read_excel()

data.bar()

下面柱状图效果用python怎么做出来？主要是横坐标的变量名要斜着写这种方式。matlab也行

matlab实现演示效果如下：

%需要新建一个function,以下是function的代码(保存时文件名只能是rotateticklabel.m)：

function th=rotateticklabel(h,rot,demo)

%ROTATETICKLABEL rotates tick labels

%   TH=ROTATETICKLABEL(H,ROT) ris the calling form where H is a handle to

%   the axis that contains the XTickLabels that are to be rotated. ROT is

%   an optional parameter that specifies the angle of rotation. The default

%   angle is 90. TH is a handle to the text objects created. For long

%   strings such as those produced by datetick, you may have to adjust the

%   position of the axes so the labels don't get cut off.

%

%   Of course, GCA can be substituted for H if desired.

%

%   TH=ROTATETICKLABEL([],[],'demo') shows a demo figure.

%

%   Known deficiencies: if tick labels are raised to a power, the power

%   will be lost after rotation.

%

%   See also datetick.

%   Written Oct 14, 2005 by Andy Bliss

%   Copyright 2005 by Andy Bliss

%DEMO:

if nargin==3

x=[now-.7 now-.3 now];

y=[20 35 15];

figure

plot(x,y,'.-')

datetick('x',0,'keepticks')

h=gca;

set(h,'position',[0.13 0.35 0.775 0.55])

rot=90;

end

%set the default rotation if user doesn't specify

if nargin==1

rot=90;

end

%make sure the rotation is in the range

% 0:360 (brute force method)

% while rot360

%     rot=rot-360;

% end

% while rot0

%     rot=rot+360;

% end

%get current tick labels

a=get(h,'XTickLabel');

%erase current tick labels from figure

set(h,'XTickLabel',[]);

%get tick label positions

b=get(h,'XTick');

c=get(h,'YTick');

%make new tick labels

if rot180

th=text(b,repmat(c(1)-.1*(c(2)-c(1)),length(b),1),a,'HorizontalAlignment','right','fontsize',14,'fontweight','bold','rotation',rot);

else

th=text(b,repmat(c(1)-.1*(c(2)-c(1)),length(b),1),a,'HorizontalAlignment','left','fontsize',14,'fontweight','bold','rotation',rot);

end

%画好图需要旋转坐标时调用上面的rotateticklabel函数，比如用以下的测试数据

x = round(rand(5,3)*10);

h=bar(x,1,'group');

set(gca,'xticklabels',{'benchmark1','benchmark2','benchmark3','benchmark4','benchmark5'});

h = gca;

th=rotateticklabel(h, 45)

%满意请采纳

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