Workshop materials: comparison day1/session2.tex

equal deleted inserted replaced

-:b5d3b5ddac7b
+:217c38c06ebd
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 % Title page
 \title[Plotting with Python]{Python for Science and Engg: Plotting experimental data}
-\author[FOSSEE] {FOSSEE}
+\author[FOSSEE group] {FOSSEE}
 \institute[IIT Bombay] {Department of Aerospace Engineering\\IIT Bombay}
-\date[] {30 April, 2010\\Day 1, Session 2}
+\date[] {SciPy 2010, Introductory tutorials,\\Day 1, Session 2}
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %\pgfdeclareimage[height=0.75cm]{iitmlogo}{iitmlogo}
 %\logo{\pgfuseimage{iitmlogo}}
 \end{frame}
 \begin{frame}[fragile]
 \frametitle{Plotting points}
 \begin{itemize}
-\item What if we want to plot the points!
+\item What if we want to plot the points?
 \end{itemize}
 \begin{lstlisting}
 In []: clf()
 In []: plot(time, distance, 'o')
 Out[]: [2, 5]
 \end{lstlisting}
 \alert{\typ{list[initial:final:step]}}
 \end{frame}
+\begin{frame}[fragile]
+\frametitle{List: Slicing}
+What is the output of the following?
+\begin{lstlisting}
+In []: p[1::2]
+In []: p[1:-1:2]
+\end{lstlisting}
+\end{frame}
 %% more on list slicing
 \begin{frame}[fragile]
 \frametitle{List operations}
 \begin{lstlisting}
 In []: b = [ 11, 13, 17]
 In []: p.append(11)
 In []: p
 Out[]: [ 2, 3, 5, 7, 11]
 \end{lstlisting}
+Question: Does \typ{c} change now that \typ{p} is changed?
 %\inctime{10}
 \end{frame}
 \section{Simple Pendulum}
 \begin{frame}[fragile]
 In []: t = [0.69, 0.90, 1.19,
 1.30, 1.47, 1.58,
 1.77, 1.83, 1.94]
 \end{lstlisting}
+\alert{Gotcha}: Make sure \typ{L} and \typ{t} have the same number
+of elements
+\begin{lstlisting}
+In []: print len(L), len(t)
+\end{lstlisting}
 \end{frame}
 \begin{frame}[fragile]
 \frametitle{Plotting $L$ vs $T^2$}
 \begin{itemize}
 \item We must square each of the values in \typ{t}
-\item How to do it?
+\item How do we do it?
 \item We use a \kwrd{for} loop to iterate over \typ{t}
 \end{itemize}
 \end{frame}
 \begin{frame}[fragile]
 ....:     tsq.append(time*time)
 ....:
 ....:
 \end{lstlisting}
-This gives \kwrd{tsq} which is the list of squares of \typ{t} values.
+This gives \typ{tsq} which is the list of squares of \typ{t} values.
 \begin{lstlisting}
 In []: print len(L), len(t), len(tsq)
 Out[]: 9 9 9
 \end{lstlisting}
 \end{frame}
 \begin{frame}[fragile]
-\frametitle{How to come out of the \texttt{for} loop?}
+\frametitle{How do you exit the \texttt{for} loop?}
 Hitting the ``ENTER'' key twice returns the cursor to the previous indentation level
 \begin{lstlisting}
 In []: for time in t:
 ....:     tsq.append(time*time)
 ....:
 \end{frame}
 \begin{frame}[fragile]
 \frametitle{Reading \typ{pendulum.txt}}
 \begin{itemize}
-\item File contains L vs. T values
+\item File contains L vs.\ T values
 \item First Column - L values
 \item Second Column - T values
 \item Let us generate a plot from the data file
 \end{itemize}
 \end{frame}
 \begin{frame}[fragile]
+\frametitle{Gotcha and an aside}
+Ensure you are in the same directory as \typ{pendulum.txt}\\
+if not, do the following on IPython:
+\begin{lstlisting}
+In []: %cd directory_containing_file
+# Check if pendulum.txt is there.
+In []: ls
+# Also try
+In []: !ls
+\end{lstlisting}
+\alert{Note:} \typ{\%cd} is an IPython magic command.  For more information
+do:
+\begin{lstlisting}
+In []: ?
+\end{lstlisting}
+\end{frame}
+\begin{frame}[fragile]
 \frametitle{Plotting from \typ{pendulum.txt}}
-Open a new script\\
+Open a new script and save as \typ{pendulum_plot.py}
-Save as \typ{pendulum_plot.py} after typing first line
 \begin{lstlisting}
 L = []
 t = []
 for line in open('pendulum.txt'):
 point = line.split()
 \end{frame}
 \begin{frame}
 \frametitle{Save and run}
 \begin{itemize}
-\item Save as pendulum\_plot.py.
+\item Save as \typ{pendulum\_plot.py}
 \item Run using \kwrd{\%run -i pendulum\_plot.py}
 \end{itemize}
 \end{frame}
 \begin{frame}[fragile]
 \item \typ{line} is a \kwrd{string}
 \end{itemize}
 \end{frame}
 \section{Strings}
 \begin{frame}[fragile]
 \frametitle{Strings}
 Anything within ``quotes'' is a string!
 \begin{lstlisting}
 ' This is a string '
 " This too! "
 """ This one too! """
 ''' And one more! '''
+\end{lstlisting}
+\end{frame}
+\begin{frame}[fragile]
+\frametitle{Strings}
+Why so many?
+\begin{lstlisting}
+' "Do or do not.  No try." said Yoda.'
+" ' is a mighty lonely quote."
+\end{lstlisting}
+The triple quoted ones can span multiple lines!
+\begin{lstlisting}
+""" The quick brown
+fox jumped over
+the lazy dingbat.
+"""
 \end{lstlisting}
 \end{frame}
 \begin{frame}[fragile]
 \frametitle{Strings and \typ{split()}}
 \section {Summary}
 \begin{frame}[fragile]
 \frametitle{What did we learn?}
 \begin{itemize}
-\item Plotting points
+\item Plot attributes and plotting points
-\item Plot attributes
 \item Lists
 \item \kwrd{for}
 \item Reading files
 \item Tokenizing
 \item Strings

branch	scipy2010
changeset 408	217c38c06ebd
parent 397	28915381ac32
child 426	7d8738ce004d