18 |
18 |
19 |
19 |
20 .. Author : Anoop Jacob Thomas <anoop@fossee.in> |
20 .. Author : Anoop Jacob Thomas <anoop@fossee.in> |
21 Internal Reviewer : Puneeth |
21 Internal Reviewer : Puneeth |
22 External Reviewer : |
22 External Reviewer : |
23 Checklist OK? : <put date stamp here, if OK> [2010-10-05] |
23 Language Reviewer : Bhanukiran |
|
24 Checklist OK? : <10-11-2010, Anand, OK> [2010-10-05] |
24 |
25 |
25 .. #[Puneeth: Quickref missing] |
26 .. #[Puneeth: Quickref missing] |
26 |
27 |
27 =================== |
28 =================== |
28 Other type of plots |
29 Other type of plots |
29 =================== |
30 =================== |
30 |
31 |
31 {{{ show the first slide }}} |
32 {{{ show the first slide }}} |
32 |
33 |
33 Hello and welcome to the tutorial other type of plots. |
34 Hello and welcome to the tutorial ``The other kinds of plots``. |
34 |
35 |
35 .. #[Puneeth: this sentence doesn't read well] |
36 .. #[Puneeth: this sentence doesn't read well] |
36 |
37 |
37 {{{ show the outline slide }}} |
38 {{{ show the outline slide }}} |
38 |
39 |
39 .. #[Puneeth: motivate looking at other plots. Why are we looking at |
40 .. #[Puneeth: motivate looking at other plots. Why are we looking at |
40 .. them? Tell that we have only looked at one type of plot all the |
41 .. them? Tell that we have only looked at one type of plot all the |
41 .. while, etc.] |
42 .. while, etc.] |
42 |
43 |
43 Till now we have seen only one type of plot, and in this tutorial us |
44 Till now we have seen only one kind of plotting, and in this tutorial we |
44 see more type of plots like scatter plot, pie chart, bar chart and |
45 are going to see more kinds of plots such as the scatter plot, the pie chart, the bar chart and |
45 log-log plot. We will see few other more plots and also see an |
46 the log-log plot. This tutorial covers the making of other kinds of |
46 introduction to matplotlib help. |
47 plots and also gives an introduction to matplotlib help. |
47 |
48 |
48 .. #[Puneeth: cover, see and introduce you. be consistent. does, the |
49 .. #[Puneeth: cover, see and introduce you. be consistent. does, the |
49 .. "We" include the viewer or not?] |
50 .. "We" include the viewer or not?] |
50 |
51 |
51 Let us start with scatter plot. |
52 Let us start with scatter plot. |
54 |
55 |
55 In a scatter plot, the data is displayed as a collection of points, |
56 In a scatter plot, the data is displayed as a collection of points, |
56 each having the value of one variable determining the position on the |
57 each having the value of one variable determining the position on the |
57 horizontal axis and the value of the other variable determining the |
58 horizontal axis and the value of the other variable determining the |
58 position on the vertical axis. This kind of plot is also called a |
59 position on the vertical axis. This kind of plot is also called a |
59 scatter chart, scatter diagram and scatter graph. |
60 scatter chart, a scatter diagram or a scatter graph. |
60 |
61 |
61 Before we proceed further, start your IPython interpreter |
62 Before we proceed further, start your IPython interpreter |
62 :: |
63 :: |
63 |
64 |
64 ipython -pylab |
65 ipython -pylab |
68 |
69 |
69 {{{ switch to the next slide having the problem statement of first |
70 {{{ switch to the next slide having the problem statement of first |
70 exercise }}} |
71 exercise }}} |
71 |
72 |
72 Now, let us plot a scatter plot showing the percentage profit of |
73 Now, let us plot a scatter plot showing the percentage profit of |
73 company A from the year 2000-2010. The data for the same is available |
74 a company A from the year 2000-2010. The data for the same is available |
74 in the file ``company-a-data.txt``. |
75 in the file ``company-a-data.txt``. |
75 |
76 |
76 {{{ open the file company-a-data.txt and show the content }}} |
77 {{{ open the file company-a-data.txt and show the content }}} |
77 |
78 |
78 The data file has two lines with a set of values in each line, the |
79 The data file has two lines with a set of values in each line, the |
79 first line representing years and the second line representing the |
80 first line representing years and the second line representing the |
80 profit percentages. |
81 profit percentages. |
81 |
82 |
82 {{{ close the file and switch to the terminal }}} |
83 {{{ close the file and switch to the terminal }}} |
83 |
84 |
84 To produce the scatter plot first we need to load the data from the |
85 To produce the scatter plot, we first need to load the data from the |
85 file using ``loadtxt``. We learned it in one of the previous sessions, |
86 file using ``loadtxt``. We learned it in one of the previous sessions, |
86 and it can be done as :: |
87 and it can be done as :: |
87 |
88 |
88 year,profit = |
89 year,profit = |
89 loadtxt('/home/fossee/other-plot/company-a-data.txt',dtype=type(int())) |
90 loadtxt('/home/fossee/other-plot/company-a-data.txt',dtype=type(int())) |
117 |
118 |
118 Pause here and solve the question before moving on. |
119 Pause here and solve the question before moving on. |
119 |
120 |
120 .. scatter(year,profit,color='r',marker='d') |
121 .. scatter(year,profit,color='r',marker='d') |
121 |
122 |
122 Now let us see another plot, pie chart and try to plot the same data |
123 Now let us see another kind of plot, the pie chart, for the same data. |
123 as a pie chart. |
|
124 |
124 |
125 .. #[Puneeth: instead of just saying that, say that let's plot a pie |
125 .. #[Puneeth: instead of just saying that, say that let's plot a pie |
126 .. chart for the same data. continuity, will be good.] |
126 .. chart for the same data. continuity, will be good.] |
127 |
127 |
128 {{{ switch to the slide which says about pie chart }}} |
128 {{{ switch to the slide which says about pie chart }}} |
163 |
163 |
164 .. pie(t,labels=s,colors=('w','r','k','m','y','b','g','c','y','m','b')) |
164 .. pie(t,labels=s,colors=('w','r','k','m','y','b','g','c','y','m','b')) |
165 |
165 |
166 {{{ switch to the slide which says about bar chart }}} |
166 {{{ switch to the slide which says about bar chart }}} |
167 |
167 |
168 Now let us move on to bar chart. A bar chart or bar graph is a chart |
168 Now let us move on to the bar charts. A bar chart or bar graph is a chart |
169 with rectangular bars with lengths proportional to the values that |
169 with rectangular bars with lengths proportional to the values that |
170 they represent. |
170 they represent. |
171 |
171 |
172 {{{ switch to the slide showing the problem statement of fifth |
172 {{{ switch to the slide showing the problem statement of fifth |
173 exercise question }}} |
173 exercise question }}} |
200 |
200 |
201 .. bar(year,profit,fill=False,hatch='/') |
201 .. bar(year,profit,fill=False,hatch='/') |
202 |
202 |
203 {{{ switch to the slide which says about log-log graph }}} |
203 {{{ switch to the slide which says about log-log graph }}} |
204 |
204 |
205 Now let us move on to log-log plot. A log-log graph or log-log plot is |
205 Now let us move on to the log-log plot. A log-log graph or a log-log plot is |
206 a two-dimensional graph of numerical data that uses logarithmic scales |
206 a two-dimensional graph of numerical data that uses logarithmic scales |
207 on both the horizontal and vertical axes. Because of the nonlinear |
207 on both the horizontal and vertical axes. Because of the nonlinear |
208 scaling of the axes, a function of the form y = ax\ :sup:`b` will |
208 scaling of the axes, a function of the form y = ax\ :sup:`b` will |
209 appear as a straight line on a log-log graph |
209 appear as a straight line on a log-log graph |
210 |
210 |