python怎么用matplotlib畫柱狀圖

Python——使用matplotlib繪制柱狀圖

創(chuàng)新互聯(lián)是一家集網(wǎng)站建設(shè),札達(dá)企業(yè)網(wǎng)站建設(shè),札達(dá)品牌網(wǎng)站建設(shè),網(wǎng)站定制,札達(dá)網(wǎng)站建設(shè)報(bào)價(jià),網(wǎng)絡(luò)營(yíng)銷,網(wǎng)絡(luò)優(yōu)化,札達(dá)網(wǎng)站推廣為一體的創(chuàng)新建站企業(yè)，幫助傳統(tǒng)企業(yè)提升企業(yè)形象加強(qiáng)企業(yè)競(jìng)爭(zhēng)力?？沙浞譂M足這一群體相比中小企業(yè)更為豐富、高端、多元的互聯(lián)網(wǎng)需求。同時(shí)我們時(shí)刻保持專業(yè)、時(shí)尚、前沿，時(shí)刻以成就客戶成長(zhǎng)自我，堅(jiān)持不斷學(xué)習(xí)、思考、沉淀、凈化自己，讓我們?yōu)楦嗟钠髽I(yè)打造出實(shí)用型網(wǎng)站。

1、基本柱狀圖

首先要安裝matplotlib 可以使用pip命令直接安裝

[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、設(shè)置顏色

[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、設(shè)置標(biāo)簽

[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、堆疊柱狀圖

下面柱狀圖效果用python怎么做出來？主要是橫坐標(biāo)的變量名要斜著寫這種方式。matlab也行

matlab實(shí)現(xiàn)演示效果如下：

%需要新建一個(gè)function,以下是function的代碼(保存時(shí)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

%畫好圖需要旋轉(zhuǎn)坐標(biāo)時(shí)調(diào)用上面的rotateticklabel函數(shù)，比如用以下的測(cè)試數(shù)據(jù)

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)

%滿意請(qǐng)采納

新手python怎么從Excel中讀取多行多列畫并列柱狀圖？

首先，dataframe自帶的柱狀圖，可以將每列作為一個(gè)圖例

import pandas as pd

data=pd.read_excel()

data.bar()