object ax through plt. gca (), and then calls the ax. plot () method to implement the real drawing.You can enter "plt. plot?" In Ipython ?? "Command to view how the functions of the pyplot module wrap various drawing objects.
1. pyplot. plot (* args, ** kwargs)
This function has two parameters: a variable parameter and a named parameter. Variable parameters can be specified with three parameters, x, y, and
Introduction to Matplotlib and simple use of pyplot-text annotation and arrow, matplotlibpyplot
When you use pyplot to draw a graph, you sometimes need to mark some text on the graph. If the curve is relatively close, you 'd better use arrows to indicate the correspondence between the text and the curve. This section describes how to use text labels and arrows.
Add annotation using
second figureplt.plot([4,5,6]) # creates a subplot(111) by defaultplt.figure(1) # figure 1 current; subplot(212) still currentplt.subplot(211) # make subplot(211) in figure1 currentplt.title('Easy as 1,2,3') # subplot 211 title
You can use the CLF () and linoleic () commands to clear the current figure and current axe.
If you create many graphs, you need to use the close () command to release the memory occupied by the graph. If you only close the graph d
Recently, I had to spend some pictures, which were originally intended to use matlab. However, sometimes matplotlib could not be tolerated by matlab. I am familiar with and like Python, so matplotlib replaces matlab.
After a few days of use, I felt good, but I felt that the document was not full enough. Some links on the web version could not be opened, so there were so many pdf versions. I couldn't find any content, so I went to the source code. Below are some of my experiences. It mainly uses
When you use pyplot to draw a graph, you sometimes need to mark some text on the graph. If the curve is relatively close, you 'd better use arrows to indicate the correspondence between the text and the curve. This section describes how to use text labels and arrows.Add annotation using pyplot. text, called by pyplot or subplot. The following are optional paramet
; How do you not want to have a long tail, you can use this to control.(8) shape= "full"; Left side or right corner, or center (full)
The corresponding official description is as follows:
Constructor arguments
width:float (default:0.001)
width of full arrow tail
length_includes_head: [True | False] (default:false)
True If the IS-counted in calculating the length.
Head_width:float or None (default:3*width) Total width of the "full"
arrow head
head_length:float or None (Defaul t
FrontierPython provides a number of modules for data visualization, including Matplotlib, Pygal. I refer to the online popular books "Python programming from the beginning to the actual combat", in the test and learning process encountered a few problems to solve, just write down this project experience, for the basic part of the Python is not detailed, mainly the project core points and solutions described. This section first describes the basic use of the
http://blog.csdn.net/pipisorry/article/details/40005163 Matplotlib.pyplot Drawing instance
{Using the Pyplot module}matplotlib draw line, bar/rectangular area
Import NumPy as NP
import Matplotlib.pyplot as plt
t = Np.arange ( -1, 2,.)
s = Np.sin (2 * np.pi * t)
PLT . Plot (T,s)
# Draw a thick red hline at y=0 that spans the xrange
L = plt.axhline (linewidth=4, color= ' R ')
PLT.A XIs ([-1, 2,-1, 2])
plt.show ()
plt.close ()
# Draw a default hline at
As mentioned above, how can we draw a partial enlarged image, such as the source image on the left and the source image on the right, and use a box or something in the source image, to enlarge the frame, you can use two lines to point to the enlarged graph from the box,Shows the effect,
This section describes how to draw a box and two lines.Draw a box and draw four lines connecting the four vertices of the box. From a point around a circle and then back to the starting point, draw a box using
Matplotlib is used at first because it does not need to take a long time to start a graphical interface like Matlab. Second, it can be directly saved as. eps format.After the image is displayed, there are several buttons in the lower left corner. The last button is save. In the Save dialog box, select. eps format. Another method is to use pyplot in the program. savefig (name, format = "eps"), you can use format to specify the format of eps, Or you can
This is to use Julia to achieve the drawing, Julia has three drawing libraries: Winston, Gadfly, PyplotHere is pyplot, in fact he is based on matplotlib1, first installed in the Juno two librariesJuno is Julia's Integrated Open Environment (IDE)If you do not have Juno installed, see here: http://blog.csdn.net/fuzimango/article/details/47721055Install both libraries in Juno: the direct ctrl+enter operation becomesPkg.add ("Dataframes") #表格库, this seems
Problem:I ubuntu14.04 under the Python matplotlib module in the Pyplot output image can not be displayed in Chinese, how to solve it?Solve:1. Specify the default encoding to UTF-8:Add the following code at the beginning of the Python codeImport sys reload (SYS) sys.setdefaultencoding ('utf-8') 2. Confirm your Ubuntu system environment with the Chinese font file:Run command "Fc-list:lang=zh" in terminal to get the Chinese font of your systemThe com
Work needs to observe the trend of data changes, with Python to write a small program to display simple charts, to share the convenience of people with the same needs, matplotlib is a very good library.#!encode=utf8 fromMatplotlibImportPyplot as PltImportSysignore_num= (int) (sys.argv[1]) Data=sys.argv[2]show_type=0ifLen (SYS.ARGV) >3: Show_type= (int) (sys.argv[3]) x=[]valid_ppl=[]train_ll=[]valid_ll=[]fi=open (data,"R") Line=Fi.readline () n=0 whileLine :ifLine.find ("Values") >=0:arr=line.spl
Workaround for _getfullpathname:emedded null character appears: (Go from http://stackoverflow.com)This was a bug in Python and not matplotlib.winreg.EnumValueThe issue is-is isn't cutting string values at their length properly for some reason, and strings would include Nu ll characters which is isn't os.path.abspath able to process.The registry entry where this happens are at SOFTWARE\Microsoft\Windows NT\CurrentVersion\Fonts . Despite this isn't being matplotlib ' s fault we can still temporari
Drawing of Matplotlib series-pyplot pie chart
Pyplot use Plt.pie () to draw a pie chart
Import Matplotlib.pyplot as plt
labels = ' frogs ', ' hogs ', ' Dogs ', ' Logs '
sizes = [15,30,45,10]
explode = ( 0,0.1,0,0) #0 1 means to highlight the Hogs piece
plt.pie (sizes,explode=explode,labels=labels,autopct= '%1.1f%% ', Shadow=false, startangle=90)
#startangle表示饼图的起始角度
plt.show ()
Run Result:
So how do y
Tags: Io ar SP on problem log HTML ad Sklearn's website does not go. Prepare to compile the documents on GitHub:
$ cd scikit-learn-master/doc$ make html
The following error occurs:
Exception occurred: File "/home/sunlt/Downloads/scikit-learn-master/doc/sphinxext/gen_rst.py", line 850, in generate_file_rst import matplotlib.pyplot as pltImportError: No module named matplotlib.pyplotThe full traceback has been saved in /tmp/sphinx-err-7pCJ3k.log, if you want to report the is
= (4, 8,), Xticks = (0, pyplot) #matplotlib.. text (x, y, S, Fontdict=none, Withdash=false, **kwargs) # The first argument is the x-axis coordinate # The second parameter is the Y coordinate # The third argument is the content to be explicit #fontsize设置显示字体大小 p Lt.text (3,, ' I ', fontsize=20) #创建第二个子图 Plt.subplot (222) #绘制两个图形 #x, y2 scatter plot, black squares #xfit, Fit (xfit) Red solid line, line width to 2 plt.plot (x, y
2, ' KS ', Xfit, Fit (xfi
Reference Matplotlib Official Guide:Https://matplotlib.org/tutorials/introductory/pyplot.html#sphx-glr-tutorials-introductory-pyplot-pyPyplot is a commonly used drawing module with very powerful functions. , let's see what it's capable of.1. Quickly draw common graphics2. Using the keyword string to draw3. Use category variables to paint4. Create Multi-image1 ImportMatplotlib.pyplot as Plt2%Matplotlib Inline3Plt.figure (1)# the first figure4Plt.subplo
. pyplot, then directly call its bar method, and finally use show to display the image. Let me explain two parameters in bar:
Left: Position of the left edge of the column. if we specify 1, the x value of the left edge of the current column is 1.0.
Height: this is the height of the column, that is, the value of the y axis.
Left and height can be replaced by a single value (a column at this time) or a tuples (multiple rectangles at this time ). F
Python Plotting Method example, python plotting example
This example describes the python plotting method. Share it with you for your reference. The details are as follows:
#-*-Coding: UTF-8-*-import matplotlib. pyplot as pltdef main (): # color list colorList = ['B', 'G', 'R', 'C', 'M', 'y ', 'K'] # The common absciss
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