colorbar (mappable=None, cax=None, ax=None, **kw) [source] ¶ Add a colorbar to a plot. colorbar() method. The colorbar in the image shows what color represents what temperature. Welcome to a Matplotlib with Python 3+ tutorial series. 3, matplotlib provides a griddata function that behaves similarly to the matlab version. Python,Matplotlib,subplot：如何设置轴范围？ 3. We can normalize the colorbar in a given range by using matplotlib. colorbarをダブルクリックしたい衝動に襲われたことがある colorbarの調整をIllustrator等で無理やりやったことがある 「cbarとcaxってなにか違うの？」と思ったことがある Seabornのheatmapなどで. Import numpy and matplotlib. This function provides an interface to many (though not all) of the possible ways you can generate colors in seaborn, and it's used internally by any function that has a palette argument (and in some cases for a color argument when multiple colors are needed). pyplot as. Scatter Plots Data visualization Contents Scatter Plots 2D Scatter Plot Correlation Analysing the Iris dataset using Scatter Plots Visualizing Patterns Multidimensional Scatter Plots 4D Scatter Plot Scatter Plots Scatter plots are used to represent the relation between two variables,…. The matplotlib_venn_wordcloud package combines Venn diagrams with word clouds for a pretty amazing (and amusing) result. Short of a major overhaul of the whole tick system, what is needed is to add full support for minor ticks to the colorbar. Here is an example plotting three surfaces: from matplotlib import pyplot as plt from matplotlib import cm from mpl_toolkits. Dave's Matplotlib Basic Examples The Matplotlib home page is the place to start for help. class: center, middle ### W4995 Applied Machine Learning # Visualization and Matplotlib 01/30/19 Andreas C. The pyplot module mirrors the MATLAB plotting command very closely. In the meantime, this Python script demonstrates an ugly but effective solution to the problem. It provides an object-oriented API for embedding plots into applications using general-purpose GUI toolkits like Tkinter, wxPython, Qt, or GTK+. Here is an example plotting three surfaces: from matplotlib import pyplot as plt from matplotlib import cm from mpl_toolkits. A bar graph or bar chart displays categorical data with parallel rectangular bars of equal width along an axis. Matplotlib is a plotting library for the Python programming language and its numerical mathematics extension NumPy. Therefore, this means that properties can always be specified by setting the appropriate arguments in methods, or by retrieving these objects. LinearSegmentedColormap( 'viridis_r', matplotlib. Using Matplotlib and simplekml to create Google-Earth Overlays Mar 10, 2014 Here is a quick example on how to create a kmzfile with image overlays using matplotlib and simplekml. It need not be temperature, it could be any other variable. ticklabel_format(style='sci', scilimits=(-6,6)) このページを編集する このページを元に新規ページを作成. The following are code examples for showing how to use matplotlib. py — Matplotlib 1. For example:. So with matplotlib, the heart of it is to create a figure. I have a matplotlib plot with a colorbar attached. See section4. 5} Plotting How to use pgfplots in LaTeX | Kun's Blog. 3D plotting with matplotlib. Nobody wants that. Keyword Research: People who searched colorbar matplotlib also searched. 1 added some tools for creating animations which are really slick. GitHub Gist: instantly share code, notes, and snippets. python – Matplotlib 2 Subplots,1 Colorbar ; 5. Function signatures for the pyplot interface; all but the first are also method signatures for the colorbar() method:. pyplot as plt %matplotlib inline matplotlib. Here is the same data visualized as a 3D histogram (here we use only 20 bins for efficiency). Set The Color Of A Matplotlib Plot. matplotlib. To change imshow colorbar label size in matplotlib, there is the tick_params function, example. cm as cm import matplotlib. have a dedicated plotting script). Matplotlib is a plotting library for the Python programming language and its numerical mathematics extension NumPy. Matplotlib is capable of creating most kinds of charts, like line graphs, scatter plots, bar charts, pie charts, stack plots, 3D graphs, and. 在基于matplotlib. The following are code examples for showing how to use matplotlib. An important question when considering whether to use matplotlib for animation is what kind of speed you need. I’ll be starting with the simplest kind of figure: a line plot, with points plotted on an X-Y Cartesian plane. I have tried the following code using matplotlib. import matplotlib. Comments on number of colors in the colormap My preference is for a small number of colors in the colormap, since this facilitates determining the value each contour stands for without requiring inline labels. References-Example 1 - Binary. Je voudrais ajouter une colorbar, mais je me retrouve toujours avec l'erreur suivante. python imshow colorbar (1) 등고선 플롯으로 matplotlib를 사용할 때 원하는대로 컬러 바를 표시하는 데 문제가 있습니다. Use dot notation to refer to a particular object and property:. How to make Bubble Charts with matplotlib In this post we will see how to make a bubble chart using matplotlib. colorbar Flip will change the projeciton from the left wall to right wall,. ColorbarBase method. mlab as mlab import matplotlib. Yet I want the 0 at the top and the 100 at the bottom, with the same sequence of colors in the colorbar. They are extracted from open source Python projects. python matplotlib自定义colorbar颜色条-以及matplotlib中的内置色条 2019-07-15 14:35:01 程序员lamed 阅读数 1149 版权声明：本文为博主原创文章，遵循 CC 4. For a dataset ranging from say -3000 to 1000, we might want a colorbar to diverge from 0. python - matplotlib colorbar for scatter ; 4. As of version 0. They are extracted from open source Python projects. The method of plotting is not so good, so I'd like to show an improved way to draw second tick axis on the colorbar. revcmap(viridis_cm. We suggest you make your hand dirty with each and every parameter of the above methods. The following are code examples for showing how to use matplotlib. If the axes contains Mapping Toolbox contour objects, the value of cdelta is ignored. Related course The course below is all about data visualization: Data Visualization with Matplotlib and Python; Bar chart code The code below creates a bar chart:. Hi Eric I am using matplotlib-0. You can set the colormap for an image, pcolor, scatter, etc, using a keyword argument:. In subplot1 the range is 15-25; in subplot2 it is 16 to 24. ColorbarPatch(ax, mappable, **kw)¶ Bases: matplotlib. A scatter plot is a type of plot that shows the data as a collection of points. whl files for Python 3. In the matplotlib imshow blog, we learn how to read, show image and colorbar with a real-time example using the mpimg. com Matplotlib DataCamp Learn Python for Data Science Interactively Prepare The Data Also see Lists & NumPy Matplotlib is a Python 2D plotting library which produces publication-quality figures in a variety of hardcopy formats and interactive environments across platforms. With raster datasets, I often find myself using diverging colour scales. python – Matplotlib 2 Subplots,1 Colorbar ; 5. This page shows how to combine two contourf and one colorbar into one figure using python and matplotlib. The following are code examples for showing how to use matplotlib. From that you get the list of text objects, which you then modify. The result I want looks like the following, but using contourf. set_fontsize(20) The colorbar function makes a new axes object, the "ax" attribute of the Colorbar instance returned by the colorbar function. The colorbar has some interesting flexibility; for example, we can narrow the color limits and indicate the out-of-bounds values with a triangular. A colorbar connects the color with the numerical values. Customized Colorbars¶. Turn on "%matplotlib inline" for plotting inside a notebook. The colorbar in the image shows what color represents what temperature. Related course. pyplot画带色标(colorbar)的图时候，往往为了美 博文 来自： weixin_43718675的博客. In this video Dr. At the current state, only every second "segment" is labelled with a tick. It was developed by John Hunter in 2002. This argument is mandatory for the Figure. mplot3d import Axes3D import numpy as np import matplotlib import matplotlib. This is because the data coordinate of the colorbar axes is not directly associated with the ticklabels. Various Plotting Examples Showing Images The imshow command allows displaying images in a variety of. By using axesgrid, the padding between subplots are guaranted to be the same. The colorbar itself is simply an instance of plt. Hunter in 2003 as a way of providing a plotting functionality similar to that of MATLAB, which at the time was the most popular programming language in academia. found a solution import numpy as np import pandas as pd import matplotlib. This was surprisingly not documented anywhere I could find. I have tried the following code using matplotlib. RGB and RGBA are sequences of, respectively, 3 or 4 floats in the range 0-1. They are extracted from open source Python projects. You might like the Matplotlib gallery. Normalize and later using it inside the norm argument of matplotlib. The colorbar has some interesting flexibility: for example, we can narrow the color limits and indicate the out-of-bounds values with a triangular. How to handle the guide when you want your colorbar from 3 to 6 as an example? Because. Easiest way to install. > > The pylab xticks and yticks functions make the retrieval and > modification of the text objects easier, but they operate only on the > "current axes", and the colorbar leaves the image axes as current. The pyplot module mirrors the MATLAB plotting command very closely. More than 1 year has passed since last update. In addition, to have the horizontal colorbar with the same size as the figure, a solution is to use the function make_axes_locatable (see also How to have the colorbar with same size as the figure in matpltolib ?): How to put the colorbar below the figure in matplotlib ?. ticker import MultipleLocator, FormatStrFormatter from matplotlib. Re: Single Colorbar for multiple subplots I modified matplotlib to let you do this by passing an array of axes to the ax argument of colorbar. The %matplotlib inline is a jupyter notebook specific command that let's you see the plots in the notbook itself. """ import matplotlib import numpy as np import matplotlib. Overview Confusion Matrix. ColorbarBase. With raster datasets, I often find myself using diverging colour scales. MaxNLocator. × Attention, ce sujet est très ancien. The code is based on this matplotlib demo. The Matplotlib subplot() function can be called to plot two or more plots in one figure. import matplotlib. Un problème récurrent avec matplotlib est de vouloir adapter la taille de la colorbar au graphique comme dans l'exemple ci-dessous: Adapter la taille de la colorbar au graphique (matplotlib) (1/2). colorbar() wants a mappable object, like the CircleCollection that plt. It is hoped that matplotlib feature request #3644, 'manually set colorbar without mappable', which was opened Oct 13, 2014, will eventually lead to a clean solution. The code below will save the figure as a png, but if you want to fiddle about some more with it in Illustrator you can also save as svg. A scatter plot is a type of plot that shows the data as a collection of points. To dynamically change default rc settings, you can use the rcParams variable: You just adjusted the line width in the example above, but you can also change figure size and dpi, line width, color and style, axes, axis and grid properties, text and font. 台湾大学录取率寒小阳matplotlib输出矢量图台湾大学开放式课程寒小阳import matplotlib as plt台湾大学什么时候放暑假机器学习寒小阳第三方库matplotlib台湾大学土木工程好吗寒小阳matplotlib api入门国立台湾大学中文系硕士申请寒小阳简历matplotlib问题台湾大学排名一览表寒小阳 课程matplotlib动态散点图台湾. Here is an example plotting three surfaces: from matplotlib import pyplot as plt from matplotlib import cm from mpl_toolkits. Matplotlib Learn Python Interactively at www. colorbar_factory(cax, mappable, **kwargs)¶. imread, plt. Ever been frustrated with colorbars on your matplotlib plots that just totally mess with the layout of your figure? I plot a lot of image data, much of it in side-by-side comparisons, and the combination of matplotlib's default colorbar behavior and subplots was really getting up my nose. arange(0,101,10)) colorbar() in the above figure, colorbar label shows 0 at the bottom and 100 at the top. 1 would crash Python every time I went to run a Matplotlib script. I would like to create and save a standalone colorbar with savefig, without needing to use imshow. class matplotlib. We suggest you make your hand dirty with each and every parameter of the above methods. A module for converting numbers or color arguments to RGB or RGBA. @bogatron already gave the answer suggested by the matplotlib docs, which produces the right height, but it introduces a different problem. Python examples for objects of class Matplotlib. 3D plotting with matplotlib. The position of the colorbar artist can be decided as for the legend. colorbar(a, ticks=[0, 0. Also the colorbar have exactly the same height as the main plot. Let's say I've got 20 Levels in the contourf plot. pyplot as plt # Define numbers of generated data points and bins per axis. Matplotlib gives you lots of freedom in how you save figures. Python,Matplotlib,subplot：如何设置轴范围？ 3. I thought I'd share here some of the things I've learned when playing around with these tools. set_fontsize(20) The colorbar function makes a new axes object, the "ax" attribute of the Colorbar instance returned by the colorbar function. python - 在matplotlib中设置轴 ; 7. 接下来我们需要添加colorbar： 在这里调用a，即前面的填充色, ticks可以控制colorbar显示的刻度，在这里可省略ticks参数。 plt. The xlims are also. scatter() Last but not least, lets add a title to the colorbar to indicate what it represents - to do this, after creating. Posted on September 17, 2014 by Thomas Cokelaer. They are extracted from open source Python projects. Either taking a fraction of space form the primary axis to be used for the coloarbar or define an additional axis somewhere to which the colorbar will be drawn into. The parameters of interest are $$\mu$$ and $$\sigma$$. pyplot画带色标(colorbar)的图时候，往往为了美 博文 来自： weixin_43718675的博客. scatter(), which functions as a mapping of y-values to a ColorMap. colorbar By default, the colorbar has seven ticks. > > I am sure that there is a way to get to what you want, but it isn't > immediately obvious. The only arrow arrow in the matplotlib arsenal that I can make look like the arrow I need is the FancyArrow, so I couldn't use ax. 介绍python很火，因为有各种库的支持，所以功能格外强大。在可视化方面，目前用得较多的是matplotlib. The following are code examples for showing how to use matplotlib. Ever been frustrated with colorbars on your matplotlib plots that just totally mess with the layout of your figure? I plot a lot of image data, much of it in side-by-side comparisons, and the combination of matplotlib's default colorbar behavior and subplots was really getting up my nose. Function signatures for the pyplot interface; all but the first are also method signatures for the colorbar() method:. A commonly asked question on the matplotlib mailing lists is "how do I make a contour plot of my irregularly spaced data?". I'm a big fan of matplotlib. In Matplotlib, every plot element is a full Python object with properties that can be edited. We can normalize the colorbar in a given range by using matplotlib. A colorbar connects the color with the numerical values. The number of elements in labels must match the length of the colormap. I want to position the colorbar so that it is horizontal, and underneath my plot. ScalarMappable(). Various Plotting Examples Showing Images The imshow command allows displaying images in a variety of. 5 is show in the bar, while the colormap covers -2 to 2 (so this could be your data range, which you record before the scaling). colorbar() function 4. This is because the data coordinate of the colorbar axes is not directly associated with the ticklabels. ListedColormap(C/255. A histogram shows the frequency on the vertical axis and the horizontal axis is another dimension. Matplotlib Learn Python Interactively at www. 25 in both graphs will be the same colour). A scatter plot is a type of plot that shows the data as a collection of points. ColorbarBase, which adds a colorbar to an existing axes, but it gives me strange results and I can't figure out how to specify attributes of the colorbar (for instance, where on the axes it is placed and what size it is). Matplotlib may be used to create bar charts. rc('font', **font) [/code. pyplot as plt. colorbar(c,orientation='horizontal',ticks=linspace(-1,1,5)) to define the spacing of the labels on the color bar. See also contour_image. pyplot as plt %matplotlib inline matplotlib. contourcmap(, Name,Value ) allows you to add a colorbar and control the properties of the colorbar. It can be used as-is to make a colorbar for a given colormap; a mappable object (e. Processing of the images is the next step, It processess all the images in a folder generated by cv2, compares all the images and generates the pickle file of the heatmap. The function allows you to create a list of tuples with 8-bit (0 to 255) or arithmetic (0. title is the title of nearest ax. The following are code examples for showing how to use matplotlib. python – matplotlib colorbar for scatter ; 4. scatter() returns. [matplotlib]colorbar scale problem. The labels input argument is specified as a string array or cell array of character vectors. Bases: matplotlib. confusion_matrix. ColorBar properties control the appearance and behavior of a ColorBar object. Matplotlib Learn Python Interactively at www. Particularly with semi transparent images (alpha < 1) and colorbar extensions and is not enabled by default see (issue #1188). Quite conveniently, the data analysis library pandas comes equipped with useful wrappers around several matplotlib plotting routines, allowing for quick and handy plotting of data frames. medium self laminating rtk color bar ppe labels pack of 25 sku. matplotlib. Colorbars can be easily added to a figure. scatter() returns. Birla Goa Campus. See section4. matplotlib is a plotting library for Python. More than 1 year has passed since last update. It provides an object-oriented API for embedding plots into applications using general-purpose GUI toolkits like Tkinter, wxPython, Qt, or GTK+. ColorBar properties control the appearance and behavior of a ColorBar object. Hunter in 2003 as a way of providing a plotting functionality similar to that of MATLAB, which at the time was the most popular programming language in academia. Matplotlib: colorbar too large If the colorbar is too big, setting the 'shrink' property helps: image processing, matplotlib, plots, presentation, python, writing. If you want to re-discuss this decision, the mailing list (with references to both discussions here) may be a better place to catch the core-devs' attention. This page shows how to draw two axis to one colorbar using python and matplotlib. 0 This website is not affiliated with Stack Overflow. Such a plot contains contour lines, which are constant z slices. The colorbar in the image shows what color represents what temperature. Along with that used different method and different parameter. What was happening was that when I called the colorbar() function in either subplot1 or subplot2, it would autoscale the plot such that the colorbar plus the plot would fit inside the 'subplot' bounding box, causing the two side-by-side plots to be two. cool norm = mpl. colorbar function, which sets the default to the current image. Using matplotlib we can associate with a point (x,y) on the graph with a specific color representing the variable that we are trying to visualize. matplotlib-colorbar. No idea how to get my scatter plot to talk to my colorbar. Building color palettes¶. The parameters of interest are $$\mu$$ and $$\sigma$$. python – Matplotlib 3D散点图与Colorbar ; 8. By changing property values, you can modify certain aspects of the colorbar. ColorbarBase, which adds a colorbar to an existing axes, but it gives me strange results and I can't figure out how to specify attributes of the colorbar (for instance, where on the axes it is placed and what size it is). colorbar(c,orientation='horizontal',ticks=linspace(-1,1,5)) to define the spacing of the labels on the color bar. xz for Arch Linux from Arch Linux Community Staging repository. Location should be 0 or 1, depending where you want the colorbar located along either the x or y direction. 3, matplotlib provides a griddata function that behaves similarly to the matlab version. imshow() and plt. class: center, middle ### W4995 Applied Machine Learning # Visualization and Matplotlib 01/30/19 Andreas C. The offending package was actually the PyPI build of numpy, specifically the DLL for OpenBLAS. You can vote up the examples you like or vote down the ones you don't like. contourf(x,y,z, levels) ) Somehow, I do only get 17 "segments" in the corresponding colorbar. For more information on confusion matrices, please see mlxtend. I am figuring out how to print clusters using scatter plot for the data having 3 feature column and clustered into 2 clusters using kmeans. prop_cycle"] = 'face'. subplots(1, 1) pc2 = ax2. 3, matplotlib provides a griddata function that behaves similarly to the matlab version. Matplotlib - bar,scatter and histogram plots Simple bar plot¶ import numpy as np import matplotlib. I would like to create and save a standalone colorbar with savefig, without needing to use imshow. colorbar() retrieve an existing colorbar, that you can do following (and upvoting :)) what I wrote here: How to retrieve colorbar instance from figure in matplotlib then: cb. The pyplot module mirrors the MATLAB plotting command very closely. A colorbar connects the color with the numerical values. colorbar() function. pyplot The result is: Some of the output data from measuring equipment have 12-bit unsigned int data. The following are code examples for showing how to use matplotlib. 0中,如何将colorbar行为恢复为matplotlib 1. 5, and "option D" (now called "viridis") will be the new default colormap in matplotlib 2. share the same y-axis with a single colorbar shared between the two in Matplotlib. colorbar(ax=ax2) The ax keyword argument specifies an the axes for which you want the colorbar drawn. The parameters of interest are $$\mu$$ and $$\sigma$$. Existing axes to draw the colorbar onto, otherwise space is taken from the main axes. This was surprisingly not documented anywhere I could find. This class connects a ColorbarBase to a ScalarMappable such as a AxesImage generated via imshow(). ticker import MultipleLocator, FormatStrFormatter from matplotlib. title is the title of nearest ax. colorbar By default, the colorbar has seven ticks. The result I want looks like the following, but using contourf. The reason setting the colorbar caused the behavior you find unusual (the colormap limits remain fixed) stems from the call to if norm. colorbar tick label fontproperties Could someone please explain how to change the font properties for a colorbar tick label, the following causes no error, but it does NOT work: ## CREATE COLORBAR ## make a copy of the image object im2 = copy. As a workaround the colorbar can be rendered with overlapping segments:: cbar = colorbar() cbar. I want to position the colorbar so that it is horizontal, and underneath my plot. art3d import Poly3DCollection import numpy as np def getFaceMidpointsZ(pc): a=[] for i in pc: v=0 for j in i: v=v+j v=v/4. add_subplot (111). Plot 12-bit tiff image with log scale colorbar using python & matplotlib. The method of plotting is not so good, so I'd like to show an improved way to draw second tick axis on the colorbar. (The pylab version is just a simple wrapper around figure. set_cmap(colmap) ## create new axis for colorbar. MaxNLocator. The only arrow arrow in the matplotlib arsenal that I can make look like the arrow I need is the FancyArrow, so I couldn't use ax. By using axesgrid, the padding between subplots are guaranted to be the same. I want the full range of the colormap displayed on the image; just the colorbar showing a fraction of the range. ScalarMappable(). 【1】matplotlib 修改坐标轴刻度值，刻度个数 【2】解决python画图中colorbar设置刻度和标签字体大小 【3】Matplotlib：给子图添加colorbar（颜色条或渐变色条）. Related course The course below is all about data visualization: Data Visualization with Matplotlib and Python; Save figure Matplotlib can save plots directly to a file using savefig(). python - 如何设置matplotlib colorbar范围？ Python matplotlib更改超过colorbar范围的值的默认颜色; python - colorbar中的奇怪范围值,matplotlib; python matplotlib colorbar设置tick formator / locator更改刻度标签; python - seaborn clustermap：设置colorbar ticks; python - 在colorbar matplotlib上记录标签. Benjamin Root : > Colorbars are a bit tricky. To add a colorbar, we need to assign the definition of the scatter plot to a variable which we then pass to the colorbar function. An important question when considering whether to use matplotlib for animation is what kind of speed you need. > > The pylab xticks and yticks functions make the retrieval and > modification of the text objects easier, but they operate only on the > "current axes", and the colorbar leaves the image axes as current. python - matplotlib colorbar for scatter ; 4. #84 Hexbin plot with Matplotlib #84 Change grid size in Hexbin A Hexbin plot is useful to represent the relationship of 2 numerical variables when you have a lot of data point. colorbar()) In this case, I think you want to use the ax keyword for colorbar, as in: pylab. Nobody wants that. Data Visualization with Matplotlib and Python; Matplotlib. random import randn. 8 yet (as of this writing). Function signatures for the pyplot interface; all but the first are also method signatures for the colorbar() method:. 04) This sets the colorbar height equal to the height of the plot for me. By using axesgrid, the padding between subplots are guaranted to be the same. from matplotlib. The colorbar in the image shows what color represents what temperature. 2つのクラスと関数を持つColorbarツールキット： ColorbarBase フルカラー描画機能を持つ基本クラス これは、指定されたカラーマップのカラーバーをそのまま使用することができます。. 0中,如何将colorbar行为恢复为matplotlib 1. > > The pylab xticks and yticks functions make the retrieval and > modification of the text objects easier, but they operate only on the > "current axes", and the colorbar leaves the image axes as current. Matplotlib supports all kind of subplots including 2x1 vertical, 2x1 horizontal or a 2x2 grid. Matplotlib version 1. Python Forums on Bytes. Overview Confusion Matrix. Matplotlib is a plotting library for the Python programming language and its numerical mathematics extension NumPy. Matplotlib is a Python plotting library which produces publication quality figures in a variety of hardcopy formats and interactive environments across platforms. In this article we will show you some examples of legends using matplotlib. They are extracted from open source Python projects. The legend() method adds the legend to the plot. FuncAnimation creates animations by repeatedly calling a function. The following are code examples for showing how to use matplotlib. Building color palettes¶. 2010/4/14 Andreas Hilboll : > So my question is: What do I need to do so that the colorbar actually has > the > range as specified by my colorNorm?. mplot3d import Axes3D import numpy as np import matplotlib import matplotlib. A Colorbar which is created using Patch rather than the default pcolor(). Ever been frustrated with colorbars on your matplotlib plots that just totally mess with the layout of your figure? I plot a lot of image data, much of it in side-by-side comparisons, and the combination of matplotlib's default colorbar behavior and subplots was really getting up my nose. ColorbarBase, which adds a colorbar to an existing axes, but it gives me strange results and I can't figure out how to specify attributes of the colorbar (for instance, where on the axes it is placed and what size it is). And I don't think they are very easy to > remove. 07,anchor=(1. In reality this should be needed only for a log scale, but it probably makes more sense to put in all the machinery instead of special-casing log scales. To add a colorbar, we need to assign the definition of the scatter plot to a variable which we then pass to the colorbar function. Contributed by Scott Sinclair import matplotlib. 接下来我们需要添加colorbar： 在这里调用a，即前面的填充色, ticks可以控制colorbar显示的刻度，在这里可省略ticks参数。 plt. So with matplotlib, the heart of it is to create a figure. add_subplot (111).