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Diffstat (limited to 'loading_data_from_files')
| -rw-r--r-- | loading_data_from_files/script.rst | 194 | ||||
| -rw-r--r-- | loading_data_from_files/slides.org | 74 | ||||
| -rw-r--r-- | loading_data_from_files/slides.tex | 97 |
3 files changed, 248 insertions, 117 deletions
diff --git a/loading_data_from_files/script.rst b/loading_data_from_files/script.rst index 029983d..0ff85c0 100644 --- a/loading_data_from_files/script.rst +++ b/loading_data_from_files/script.rst @@ -14,7 +14,6 @@ .. 1. getting started with ``ipython`` -.. #[Anand: author and internal reviewer not mentioned] .. Author : Puneeth Changanti Internal Reviewer : Nishanth Amuluru External Reviewer : @@ -24,131 +23,165 @@ Script ------ +.. L1 + {{{ Show the first slide containing title, name of the production team along with the logo of MHRD }}} +.. R1 + Hello Friends. Welcome to this tutorial on "loading data from files". +.. L2 + {{{ Show slide with objectives }}} -We often require to plot points obtained from experimental -observations. +.. R2 At the end of this tutorial, you will be able to, - 1. Read data from files, containing a single column of data using the ``loadtxt`` command. + 1. Read data from files, containing a single column of data #. Read multiple columns of data, separated by spaces or other delimiters. -{{{ switch to the terminal }}} +.. L3 -As usual, let us start IPython, using +{{{ switch to the terminal }}} :: - ipython -pylab + ipython -pylab + +.. R3 + +As usual, let us switch to the terminal and start IPython, using ipython -pylab + +.. R4 Now, Let us begin with reading the file primes.txt, which contains -just a list of primes listed in a column, using the loadtxt command. +a list of prime numbers listed in a column, using the loadtxt command. +Please make sure that you provide the correct path of the file 'primes.txt'. The file, in our case, is present in ``/home/fossee/primes.txt``. +.. L4 + {{{ Navigate to the path in the OS, open the file and show it }}} -.. #[punch: do we need a slide for showing the path?] +.. L5 +:: -.. We use the ``cat`` command to see the contents of this file. + cat /home/fossee/primes.txt -.. #[punch: should we show the cat command here? seems like a good place - to do it] :: +.. R5 - cat /home/fossee/primes.txt +Otherwise we can use the ``cat`` command to locate the file and read the contents of it. -.. #[Nishanth]: A problem for windows users. - Should we simply open the file and show them the data - so that we can be fine with GNU/Linux ;) and windows? +.. R6 Now let us read this list into the variable ``primes``. + +.. L6 :: - primes = loadtxt('/home/fossee/primes.txt') + primes = loadtxt('/home/fossee/primes.txt') + +.. R7 -``primes`` is now a sequence of primes, that was listed in the file, +``primes`` is now a sequence of prime numbers, that was listed in the file, ``primes.txt``. We now type, ``print primes`` to see the sequence printed. -We observe that all of the numbers end with a period. This is so, -because these numbers are actually read as ``floats``. We shall learn -about them, later. +.. L7 +:: -Now, let us use the ``loadtxt`` command to read a file that contains -two columns of data, ``pendulum.txt``. This file contains the length -of the pendulum in the first column and the corresponding time period -in the second. Note that ``loadtxt`` needs both the columns to have -equal number of rows. + print primes + +.. R8 + +We observe that all the numbers end with a period. This is so, +because these numbers are actually read as ``floats``. + +.. L8 + +{{{Highlight the output on the terminal}}} -.. Following is an exercise that you must do. +.. R9 -.. %%1%% Use the ``cat`` command to view the contents of this file. +Now, let us use the ``loadtxt`` command to read a file ``pendulum.txt`` that contains +two columns of data. This file contains the length +of the pendulum in the first column and the corresponding time period +in the second. Note that here ``loadtxt`` needs both the columns to have +equal number of rows. -.. Please, pause the video here. Do the exercise and then continue. +We use the ``cat`` command to view the contents of this file. -.. This is how we look at the contents of the file, ``pendulum.txt`` -.. :: +.. L9 +:: -.. cat /home/fossee/pendulum.txt + cat /home/fossee/pendulum.txt -.. #[Nishanth]: The first column is L values and second is T values - from a simple pendulum experiment. - Since you are using the variable names later in the - script. - Not necessary but can be included also. +.. R10 Let us, now, read the data into the variable ``pend``. Again, it is assumed that the file is in ``/home/fossee/`` + +.. L10 :: - pend = loadtxt('/home/fossee/pendulum.txt') + pend = loadtxt('/home/fossee/pendulum.txt') + +.. R11 Let us now print the variable ``pend`` and see what's in it. + +.. L11 :: - print pend + print pend + +.. R12 Notice that ``pend`` is not a simple sequence like ``primes``. It has two sequences, containing both the columns of the data file. Let us use an additional argument of the ``loadtxt`` command, to read it into two separate, simple sequences. + +.. L12 :: - L, T = loadtxt('/home/fossee/pendulum.txt', unpack=True) + L, T = loadtxt('/home/fossee/pendulum.txt', unpack=True) -.. #[Nishanth]: It has a sequence of items in which each item contains - two values. first is l and second is t +.. R13 Let us now, print the variables L and T, to see what they contain. + +.. L13 + :: - print L - print T + print L + print T -.. #[Nishanth]: Stress on ``unpack=True`` ?? +.. R14 Notice, that L and T now contain the first and second columns of data from the data file, ``pendulum.txt``, and they are both simple sequences. ``unpack=True`` has given us the two columns into two separate sequences instead of one complex sequence. -{{{ show the slide with loadtxt --- other features }}} +.. L14 + +.. R15 + +Till now, we have learnt the basic use of the ``loadtxt`` +command.Let us try an example. -In this tutorial, we have learnt the basic use of the ``loadtxt`` -command, which is capable of doing a lot more than we have used it for -until now. Let us look at an example, but before that do this -exercise. +Pause the video here, try out the following exercise and resume the video. -%%1%% Read the file ``pendulum_semicolon.txt`` which contains the same +Read the file ``pendulum_semicolon.txt`` which contains the same data as ``pendulum.txt``, but the columns are separated by semi-colons instead of spaces. Use the IPython help to see how to do this. -Please, pause the video here. Do the exercise and then continue. +.. L15 {{{ switch back to the terminal }}} :: @@ -159,20 +192,63 @@ Please, pause the video here. Do the exercise and then continue. print T -This brings us to the end of this tutorial. +.. L16 {{{ show the summary slide }}} -You should now be able to do the following, comfortably. +.. R16 + +This brings us to the end of this tutorial. +let's revise quickly what we have learnt today.In this tutorial we learnt, - + Read data from files, containing a single column of data using the + 1. To Read data from files, containing a single column of data using the ``loadtxt`` command. - + Read multiple columns of data, separated by spaces or other - delimiters. + #. To Read multiple columns of data, separated by spaces or other delimiters. + +.. L17 + +{{Show self assessment questions slide}} + +.. R17 + +1. ``loadtxt`` can read data only from a file with one column + only. True or False? + +2. Given a file ``data.txt`` with three columns of data separated by + spaces, read it into 3 separate simple sequences. + +3. Given a file ``data.txt`` with three columns of data separated by + ":", read it into 3 separate simple sequences. + + +.. L18 + +{{{solution of self assessment questions on slide}}} + +.. R18 + +And the answers, + +1. False. ``loadtxt`` command can read data from files having both single columns as well as + multiple columns. + +2. A file with three columns of data seperated by spaces to be read into 3 seperate sequences, + we use the loadtxt command as, +:: + + x = loadtxt("data.txt", unpack=True) + +3. If a file with three columns of data seperated by delimiters,we read it into three seperate sequences + by using an additional argument of delimiter in the loadtxt command +:: + + x = loadtxt("data.txt", unpack=True, delimiter=":") + +.. L19 -{{{ Show the "sponsored by FOSSEE" slide }}} +{{{ Show the Thankyou slide }}} -This tutorial was created as a part of FOSSEE project, NME ICT, MHRD India +.. R19 Hope you have enjoyed and found it useful. Thank you! diff --git a/loading_data_from_files/slides.org b/loading_data_from_files/slides.org index 91c188a..4691c98 100644 --- a/loading_data_from_files/slides.org +++ b/loading_data_from_files/slides.org @@ -18,7 +18,7 @@ #+LaTeX_HEADER: commentstyle=\color{red}\itshape, stringstyle=\color{darkgreen}, #+LaTeX_HEADER: showstringspaces=false, keywordstyle=\color{blue}\bfseries} -#+TITLE: Loading data from files +#+TITLE: #+AUTHOR: FOSSEE #+EMAIL: #+DATE: @@ -29,37 +29,61 @@ #+OPTIONS: H:3 num:nil toc:nil \n:nil @:t ::t |:t ^:t -:t f:t *:t <:t #+OPTIONS: TeX:t LaTeX:nil skip:nil d:nil todo:nil pri:nil tags:not-in-toc -* Outline - + Read data from files with a single column of data - + Read data from files with multiple columns +* + #+begin_latex +\begin{center} +\textcolor{blue}{Loading Data from Files} +\end{center} +\begin{center} +\includegraphics[scale=0.25]{../images/iitb-logo.png}\\ +Developed by FOSSEE Team, IIT-Bombay. \\ +Funded by National Mission on Education through ICT + +MHRD, Govt. of India +\end{center} +#+end_latex +* Objectives + At the end of this tutorial, you will be able to, + - Read data from files with a single column of data. + - Read data from files with multiple columns seperated by + spaces and other delimiters. * Question 1 - Read the file ~pendulum_semicolon.txt~ which contains the same data - as ~pendulum.txt~, but the columns are separated by semi-colons - instead of spaces. Use the IPython help to see how to do this. -* Solution 1 - #+begin_src python - In []: L, T = loadtxt('/home/fossee/pendulum_semicolon.txt', unpack=True, delimiter=';') - - In []: print L - - In []: print T - #+end_src + Read the file ~pendulum\_semicolon.txt~ which contains the same data + as ~pendulum.txt~ , but the columns are seperated by semi-colons instead + of spaces.Use the IPython help to see how to do this. * Summary - + Read data from files, containing a single column of data using the + In this tutorial,we have learnt to- + - Read data from files, containing a single column of data using the ~loadtxt~ command. - + Read multiple columns of data, separated by spaces or other - delimiters. -* Thank you! + - Read multiple columns of data, separated by spaces or other + delimiters by adding additional arguments to the ~loadtxt~ command. +* Evaluation + 1. ``loadtxt`` can read data only from a file with one column only. + True or False? + + 2. Given a file ``data.txt`` with three columns of data separated by + spaces, read it into 3 separate simple sequences. + + 3. Given a file ``data.txt`` with three columns of data separated by + ":", read it into 3 separate simple sequences. + +* Solutions + 1. False + + 2. x = loadtxt("data.txt", unpack=True) + + 3. x = loadtxt("data.txt", unpack=True, delimiter=":") +* Acknowledgement #+begin_latex - \begin{block}{} + \begin{block}{} \begin{center} - This spoken tutorial has been produced by the - \textcolor{blue}{FOSSEE} team, which is funded by the + \textcolor{blue}{\Large THANK YOU!} \end{center} + \end{block} +\begin{block}{} \begin{center} - \textcolor{blue}{National Mission on Education through \\ - Information \& Communication Technology \\ - MHRD, Govt. of India}. + For more Information, visit our website\\ + \url{http://fossee.in/} \end{center} \end{block} #+end_latex diff --git a/loading_data_from_files/slides.tex b/loading_data_from_files/slides.tex index 858d769..1a8cc3a 100644 --- a/loading_data_from_files/slides.tex +++ b/loading_data_from_files/slides.tex @@ -1,4 +1,4 @@ -% Created 2010-10-10 Sun 18:12 +% Created 2011-05-06 Fri 12:18 \documentclass[presentation]{beamer} \usepackage[latin1]{inputenc} \usepackage[T1]{fontenc} @@ -23,14 +23,14 @@ commentstyle=\color{red}\itshape, stringstyle=\color{darkgreen}, showstringspaces=false, keywordstyle=\color{blue}\bfseries} \providecommand{\alert}[1]{\textbf{#1}} -\title{Loading data from files} +\title{} \author{FOSSEE} \date{} \usetheme{Warsaw}\usecolortheme{default}\useoutertheme{infolines}\setbeamercovered{transparent} \begin{document} -\maketitle + @@ -41,61 +41,92 @@ showstringspaces=false, keywordstyle=\color{blue}\bfseries} \begin{frame} -\frametitle{Outline} -\label{sec-1} -\begin{itemize} -\item Read data from files with a single column of data -\item Read data from files with multiple columns -\end{itemize} +\begin{center} +\textcolor{blue}{Loading Data from Files} +\end{center} +\begin{center} +\includegraphics[scale=0.25]{../images/iitb-logo.png}\\ +Developed by FOSSEE Team, IIT-Bombay. \\ +Funded by National Mission on Education through ICT + +MHRD, Govt. of India +\end{center} \end{frame} \begin{frame} -\frametitle{Question 1} +\frametitle{Objectives} \label{sec-2} - Read the file \texttt{pendulum\_semicolon.txt} which contains the same data - as \texttt{pendulum.txt}, but the columns are separated by semi-colons - instead of spaces. Use the IPython help to see how to do this. + At the end of this tutorial, you will be able to, + +\begin{itemize} +\item Read data from files with a single column of data. +\item Read data from files with multiple columns seperated by + spaces and other delimiters. +\end{itemize} \end{frame} -\begin{frame}[fragile] -\frametitle{Solution 1} +\begin{frame} +\frametitle{Question 1} \label{sec-3} -\lstset{language=Python} -\begin{lstlisting} -In []: L, T = loadtxt('/home/fossee/pendulum_semicolon.txt', unpack=True, delimiter=';') - -In []: print L - -In []: print T -\end{lstlisting} + Read the file \verb~pendulum\_semicolon.txt~ which contains the same data + as \verb~pendulum.txt~ , but the columns are seperated by semi-colons instead + of spaces.Use the IPython help to see how to do this. \end{frame} \begin{frame} \frametitle{Summary} \label{sec-4} + In this tutorial,we have learnt to- + \begin{itemize} \item Read data from files, containing a single column of data using the - \texttt{loadtxt} command. + \verb~loadtxt~ command. \item Read multiple columns of data, separated by spaces or other - delimiters. + delimiters by adding additional arguments to the \verb~loadtxt~ command. \end{itemize} \end{frame} \begin{frame} -\frametitle{Thank you!} +\frametitle{Evaluation} \label{sec-5} - \begin{block}{} + +\begin{enumerate} +\item ``loadtxt`` can read data only from a file with one column only. + True or False? +\item Given a file ``data.txt`` with three columns of data separated by + spaces, read it into 3 separate simple sequences. +\item Given a file ``data.txt`` with three columns of data separated by + ``:'', read it into 3 separate simple sequences. +\end{enumerate} + +\end{frame} +\begin{frame} +\frametitle{Solutions} +\label{sec-6} + + +\begin{enumerate} +\item False +\item x = loadtxt(``data.txt'', unpack=True) +\item x = loadtxt(``data.txt'', unpack=True, delimiter='':'') +\end{enumerate} +\end{frame} +\begin{frame} +\frametitle{Acknowledgement} +\label{sec-7} + + \begin{block}{} \begin{center} - This spoken tutorial has been produced by the - \textcolor{blue}{FOSSEE} team, which is funded by the + \textcolor{blue}{\Large THANK YOU!} \end{center} + \end{block} +\begin{block}{} \begin{center} - \textcolor{blue}{National Mission on Education through \\ - Information \& Communication Technology \\ - MHRD, Govt. of India}. + For more Information, visit our website\\ + \url{http://fossee.in/} \end{center} \end{block} \end{frame} -\end{document} +\end{document}
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