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python怎么用matplotlib畫柱狀圖
Python——使用matplotlib繪制柱狀圖
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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、設置標簽
[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
求助，python畫柱狀圖，如何在里面填充不同圖案
bar函數調用中添加輸入參數hatch，例子如下：
import?matplotlib.pyplot?as?plt
x1_value=1
y1_value=10
x2_value=2
y2_value=20
bar_width?=?0.2
plt.bar(x1_value,?y1_value,?bar_width,?hatch='*')
plt.bar(x2_value,?y2_value,?bar_width,?hatch='/')
picName='test.png'
plt.savefig(output_path?+?picName,?dpi=200)
結果：
關于hatch值的填法，可參考：
下面柱狀圖效果用python怎么做出來？主要是橫坐標的變量名要斜著寫這種方式。matlab也行
matlab實現演示效果如下：
%需要新建一個function,以下是function的代碼(保存時文件名只能是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
%畫好圖需要旋轉坐標時調用上面的rotateticklabel函數，比如用以下的測試數據
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)
%滿意請采納
當前名稱：柱狀圖函數python python柱狀圖圖例
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