Python chart plotting using Matplotlib.pptx

Why Data Visualization?
What is Data Visualization?
What is matplotlib?
Types of charts
Basic of matplotlib
Bar chart,
Histogram
Pie chart
Scatter chart
Stack plot
Subplot
References
adding extra feature to all types of chart like Bar chart, Histogram, Stack plot

1. Using Matplotlib Ms. Sonali Mahendra Sonavane G. H. Raisoni Institute of Engineering & Technology, Pune

2. Contents Why Data Visualization? What is Data Visualization? What is matplotlib ? Types of charts Basic of matplotlib Bar chart Histogram Pie chart Scatter chart Stack plot Subplot References

3. Need of Data Visualization Humans can remember/understand things easily when it is in picture form.

4. Cont… Data visualization helps us to rapidly understand the data and alter different variables as per our requirement.

5. What is Data Visualization? Data visualization is the graphical representation of information & data. Common ways of Data Visualization are: Tables Charts Graphs Maps

6. What is matplotlib ? Matplotlib is widely used Python library for data visualization. It is a library for generating 2 Dimensional plots from data in arrays. It was invented by John Hunter in the year 2002 . Matplotlib has many plots like pie chart, line , bar chart, scatter plot, histogram, area plot etc . Matplotlib is inscribed in Python and uses NumPy library, the numerical mathematics extension of Python.

7. Types of Plot Line Plot Stack Plot Scatter plot Pie Chart Histogram Bar Chart

8. Line plot Some basic code to plot simple graph. Co-ordinates :(1,4)(2,5)(3,1) import matplotlib.pyplot as plt plt.plot([1,2,3],[4,5,1]) plt.show()

9. Line plot Cont… Lets add label to the graph: import matplotlib.pyplot as plt x=[1,2,3] y=[4,5,1] plt.plot(x , y) plt.title("Info") plt.xlabel("x-axis") plt.ylabel("y-axis") plt.show()

10. Line Plot cont… import matplotlib.pyplot as plt x1=[1,2,3] y1=[4,5,1] x2=[5,8,10] y2=[12,16,6] plt.plot(x1,y1,color='g', label='line one', linewidth =6) plt.plot(x2,y2,color='b', label='line two', linewidth=6) plt.title("Info") plt.xlabel("x-axis") plt.ylabel("y-axis") plt.legend() plt.grid(True, color='k') plt.show()

11. Line plot features

12. Line plot features Cont… fontsize fontstyle: normal,italic,oblique fontweight: normal,bold,heavy,light,ultrabold,ultralight backgroundcolor: any color rotation: any angle

13. Example import matplotlib.pyplot as plt from pylab import * x =linspace(-3, 3, 30) y = x**2 plt.plot(x, y) plt.show()

14. Example import matplotlib.pyplot as plt from pylab import * x =linspace(-3, 3, 30) y = sin(x) plt.plot(x, y,"g.") plt.show()

15. Example import matplotlib.pyplot as plt from pylab import * x =linspace(-3, 3, 30) plt.plot(x, sin(x)) plt.plot(x, cos(x), 'r-') plt.plot(x, -sin(x), 'g--') plt.show()

16. Bar chart import matplotlib.pyplot as plt plt.bar([1,2,3],[4,5,1],label='example one') plt.bar([4,5,7],[6,8,9],label="example two", color='g') plt.legend() plt.title("info") plt.xlabel("x-axis") plt.ylabel("y-axis") plt.show()

17. Bar chart cont… Q)Create Bar chart for following data: Languages known = [c++,c,java,python,php] No. of students=[26,25,34,54,23]

18. Bar chart cont… from matplotlib import pyplot as plt import numpy as np no_of_students=[22,34,54,34,45] lang_known=['c','c++','java', 'python', ' php '] plt.bar(lang_known, no_of_students) plt.show()

19. from matplotlib import pyplot as plt Example import numpy as np no_of_students=[22,34,54,34,45] lang_known=['c', 'c++','java', 'python', ' php '] plt.bar(lang_known, no_of_students) plt.minorticks_on() plt.grid(which='major', linestyle='-', linewidth='0.5', color='red') # Customize the minor grid plt.grid(which='minor', linestyle=':', linewidth='0.5', color='black') plt.show()

20. Example import numpy as np import matplotlib.pyplot as plt data = [30, 25, 50, 20], [39, 23, 51.5, 17], [34.8, 21.8, 45, 19]] X = np.arange(4) plt.bar(X + 0.00, data[0], color = 'b', width = 0.25,label=' raisoni college') plt.bar(X + 0.25, data[1], color = 'g', width = 0.25,label='JSPM') plt.bar(X + 0.50, data[2], color = 'r', width = 0.25,label='DPCOE') plt.legend() plt.xticks(X,('2015','2016','2017','2018')) plt.show()

21. Histogram A histogram is an correct illustration of the distribution of numeric data To create a histogram, use following steps: Bin   is collection of values. Distribute the entire values into a chain of intervals. Sum how many values are in each interval.

22. Assignment stud_marks=[45,56,32,67,56,76,34,28,67,70,59,61,34,42,76,54,52,47] bins=[0,25,50,75,100] Find the students makes in range 0-24,25-49,50-74,75-100 Solution: 0-24: 0 25-49:7 50-74:9 75-100:2

23. Solution import matplotlib.pyplot as plt stud_marks=[45,56,32,67,56,76,34,28,67,70,59,61,34,42,76,54,52,47] bins=[0,25,50,75,100] plt.hist( stud_marks , bins, histtype='bar', rwidth=0.8) plt.title("Info") plt.xlabel("x-axis") plt.ylabel("y-axis") plt.xticks([0,25,50,75,100]) plt.legend() plt.show()

24. Histogram Histogram types ‘bar’ is a customary bar chart type histogram. In this several data are arranged as bars side by side. ‘ barstacked’ is another bar-type histogram where numerous data are arranged on top of each other. ‘step’ makes a lineplot which is not filled . ‘stepfilled’ produces a lineplot which is filled by default.

25. Histogram Example Q)Draw histogram for following data: [3,5,8,11,13,2,19,23,22,25,3,10,21,14,9,12,17,22,23,14] Use range as 1-8,9-16,17-25 plot histogram type as ‘ stepfilled ’.

26. Pie Chart A Pie Chart can show sequence of data. The information points in a pie chart are displayed as a percentage of the total pie. following are the parameters used for a pie chart : X: array like, The wedge sizes. Labels list: A arrangement of strings which provides the tags/name for each slice. Colors: An order of matplotlibcolorargs through which the pie chart will rotate. If Not any, It uses the the currently active cycle color. Autopct : It is a string used to name the pie slice with their numeric value. The name is placed inside the pie slice. The format of the name is enclosed in %pct%.

27. Pie chart example from matplotlib import pyplot as plt import numpy as np langs = ['C', 'C++', 'Java', 'Python', 'PHP'] students = [23,17,35,29,12] plt.pie(students, labels = langs,autopct='%1.2f%%') plt.show()

28. Example from matplotlib import pyplot as plt import numpy as np langs = ['C', 'C++', 'Java', 'Python', 'PHP'] students = [23,17,35,29,12] cols=['b' ,'r', 'm', 'y', 'g'] plt.pie(students, labels = langs, colors=cols, autopct='%1.2f%%',shadow=True ,explode=(0,0.1,0,0,0)) plt.show()

29. Assignment Write a Python programming to create a pie chart with a title of the popularity of programming Sample data: Programming languages: Java, Python, PHP, JavaScript, C#, C++ Popularity: 22.2, 17.6, 8.8, 8, 7.7, 6.7and explode java and PHP content. Also add title as “popularity of programming ”

30. Scatter Plot Scatter plot plots data on vertical & horizontal axis as per its values. import matplotlib.pyplot as plt x=[1,2,3] y=[4,5,1] plt.scatter(x, y) plt.title("Info") plt.xlabel("x-axis") plt.ylabel("y-axis") plt.show()

31. Example import matplotlib.pyplot as plt girls_grades = [89, 90, 70, 89, 100, 80, 90, 100, 80, 34] boys_grades = [30, 29, 49, 48, 100, 48, 38, 45, 20, 30] grades_range = [10, 20, 30, 40, 50, 60, 70, 80, 90, 100] plt.scatter(grades_range, girls_grades, color='r',label='girls grade',linewidths=3) plt.scatter(grades_range, boys_grades, color='b',label='boys grade',linewidths=3) plt.xlabel('Grades Range') plt.ylabel('Grades Scored') plt.title('scatter plot',color='r',loc='left') plt.legend() plt.show()

32. Assignment Write a Python program to draw a scatter plot comparing two subject marks of Mathematics and Science. Use marks of 10 students. Test Data: math_marks = [88, 92, 80, 89, 100, 80, 60, 100, 80, 34] science_marks = [35, 79, 79, 48, 100, 88, 32, 45, 20, 30] marks_range = [10, 20, 30, 40, 50, 60, 70, 80, 90, 100]

33. Stack plots Stackplots are formed by plotting different datasets vertically on top of one another rather than overlapping with one another. import numpy as np import matplotlib.pyplot as plt x = [1, 2, 3, 4, 5] y1 = [1, 1, 2, 3, 5] y2 = [0, 4, 2, 6, 8] y3 = [1, 3, 5, 7, 9] labels = ["Fibonacci ", "Evens", "Odds"] plt.stackplot(x, y1, y2, y3, labels=labels) plt.legend(loc='upper left') plt.show()

34. Working with multiple plot s In  Matplotlib,  subplot() function is used to plot two or more plots in one figure. Matplotlib supports various types of subplots i.e . 2x1 horizontal ,2x1 vertical, or a 2x2 grid.

35. Example import matplotlib.pyplot as plt import numpy as np t = np.arange(0.0, 20.0, 1) s = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20] plt.subplot(2,1,1) plt.title('subplot(2,1,1)') plt.plot( t,s ) plt.subplot(2,1,2) plt.title('subplot(2,1,2)') plt.plot( t,s,'r -') plt.show()

36. Example import matplotlib.pyplot as plt import numpy as np t = np.arange(0.0, 20.0, 1) s = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20] plt.subplot(2,2,1) plt.title('subplot(2,2,1)') plt.plot( t,s,'k ') plt.subplot(2,2,2) plt.title('subplot(2,2,2)') plt.plot( t,s,'r ') plt.subplot(2,2,3) plt.title('subplot(2,2,3)') plt.plot( t,s,'g ') plt.subplot (2,2,4) plt.title('subplot(2,2,4)') plt.plot ( t,s,'y ') plt.show()

37. Example Draw subplot for each sin(x), cos (x),-sin(x) and – cos (x) function import matplotlib.pyplot as plt from pylab import * x =linspace(-3, 3, 30) plt.plot(x, sin(x)) plt.plot(x, cos(x), 'r-') plt.plot(x, -sin(x), 'g--') Plt.plot(x,-cos(x),’y:’) plt.show()

38. References [1] https://www.geeksforgeeks.org/python-introduction-matplotlib/ [2]https://matplotlib.org [3]https://www.tutorialspoint.com/matplotlib/index.htm

39. Thank you!!! [email protected]