Workshop materials: comparison day1/session2.tex

equal deleted inserted replaced

-:ac457f7d1702
+:10528e3073ef
 \frametitle{Outline}
 \tableofcontents
 % You might wish to add the option [pausesections]
 \end{frame}
+%\begin{frame}
+%\frametitle{Python Scripts\ldots}
+%  \begin{itemize}
+%    \item Open a new file in an \alert{editor}
+%    \item Copy and paste from the output of \typ{\%hist -n}
+%    \item Save the file as \typ{sine_plot.py}
+%  \end{itemize}
+%  \begin{itemize}
+%  \item run the file in IPython using \typ{\%run -i sine_plot.py}\\
+%  \end{itemize}
+%\end{frame}
 \section{Scripts}
 \begin{frame}[fragile]
 \frametitle{Python Scripts}
 \begin{itemize}
 \end{itemize}
 \end{frame}
 \section{Lists}
 \begin{frame}[fragile]
-\frametitle{How to create the data?}
+\frametitle{Lists: Introduction}
-What were \typ{x} and \typ{y}?\\
+\begin{lstlisting}
+In []: x = [0, 1, 2, 3]
+In []: y = [7, 11, 15, 19]
+\end{lstlisting}
+What are \typ{x} and \typ{y}?\\
 \begin{center}
 \alert{\typ{lists!!}}
 \end{center}
+\end{frame}
+\begin{frame}[fragile]
+\frametitle{Lists: Initializing \& accessing elements}
 \begin{lstlisting}
 In []: mtlist = [] #Empty List
-In []: lst = [ 1, 2, 3, 4, 5]
+In []: a = [ 1, 2, 3, 4, 5]
-\end{lstlisting}
-\end{frame}
+In []: a[0]+a[1]+a[-1]
-\begin{frame}[fragile]
-\frametitle{Accessing elements of a list}
-\begin{lstlisting}
-In []: lst[0]+lst[1]+lst[-1]
 Out[]: 8
 \end{lstlisting}
 \end{frame}
 \begin{frame}[fragile]
 \frametitle{List: Slicing}
 \begin{block}{Remember\ldots}
-	\kwrd{In []: lst = [ 1, 2, 3, 4, 5]}
+	\kwrd{In []: a = [ 1, 2, 3, 4, 5]}
 \end{block}
 \begin{lstlisting}
-In []: lst[1:3]  # A slice.
+In []: a[1:3]  # A slice.
 Out[]: [2, 3]
-In []: lst[1:-1]
+In []: a[1:-1]
 Out[]: [2, 3, 4]
 \end{lstlisting}
 \alert{\typ{list[initial:final]}}
 \end{frame}
 %% more on list slicing
 \begin{frame}[fragile]
 \frametitle{List operations}
 \begin{lstlisting}
-In []: a = [ 6, 7, 8, 9]
+In []: b = [ 6, 7, 8, 9]
-In []: b = lst + a
+In []: c = a + b
-In []: b
+In []: c
 Out[]: [1, 2, 3, 4, 5, 6, 7, 8, 9]
-In []: lst.append(6)
+In []: a.append(6)
-In []: lst
+In []: a
 Out[]: [ 1, 2, 3, 4, 5, 6]
 \end{lstlisting}
 %\inctime{10}
 \end{frame}
 \section{Simple Pendulum}
 \begin{frame}[fragile]
 \frametitle{Simple Pendulum - L and T}
-Let us look at the example of the Simple Pendulum experiment.
+Let us look at the Simple Pendulum experiment.
 \begin{center}
 \begin{small}
 \begin{tabular}{| c | c | c |}
 \hline
 $L$ & $T$ & $T^2$ \\ \hline
 \end{frame}
 \begin{frame}[fragile]
 \frametitle{Lets use lists}
 \begin{lstlisting}
-In []: L = [0.1, 0.2, 0.3, 0.4, 0.5,
+In []: l = [0.1, 0.2, 0.3, 0.4, 0.5,
 0.6, 0.7, 0.8, 0.9]
-In []: T = [0.69, 0.8989, 1.1867,
+In []: t = [0.69, 0.8989, 1.1867,
 1.2991, 1.4656, 1.5843,
 1.7706, 1.8296, 1.9440]
 \end{lstlisting}
 \end{frame}
 \begin{frame}[fragile]
 \frametitle{Plotting $L$ vs $T^2$}
 \begin{itemize}
-\item We must square each of the values in T
+\item We must square each of the values in \typ{t}
 \item How to do it?
-\item We use a \kwrd{for} loop to iterate over T
+\item We use a \kwrd{for} loop to iterate over \typ{t}
 \end{itemize}
 \end{frame}
 \begin{frame}[fragile]
 \frametitle{Plotting $L$ vs $T^2$}
 \begin{lstlisting}
-In []: TSq = []
+In []: tsq = []
-In []: for t in T:
+In []: for time in t:
-....:     TSq.append(t*t)
+....:     tsq.append(time*time)
-In []: plot(L, TSq)
+In []: plot(l, tsq)
 Out[]: [<matplotlib.lines.Line2D object at 0xa5b05ac>]
 \end{lstlisting}
-This gives \kwrd{TSq} which is the list of squares of T values.
+This gives \kwrd{tsq} which is the list of squares of \typ{t} values.
+\end{frame}
+\begin{frame}[fragile]
+\frametitle{How to come out of the \textt{for} loop?}
+Hit the ``enter'' key twice to come to the previous indentation level
+\begin{lstlisting}
+In []: for time in t:
+....:     tsq.append(time*time)
+....:
+....:
+In []:
+\end{lstlisting}
 \end{frame}
 \begin{frame}[fragile]
 \begin{figure}
 \includegraphics[width=3.5in]{data/L-TSq-limited.png}
 1.3000e-01 7.5360e-01
 1.4000e-01 8.3568e-01
 1.5000e-01 8.6789e-01
 \end{lstlisting}
 \ldots
+\begin{block}{Windows users:}
+>type pendulum.txt
+\end{block}
 \end{frame}
 \begin{frame}[fragile]
 \frametitle{Reading \typ{pendulum.txt}}
 \begin{itemize}
 \item L - Column1; T - Column2
 \end{itemize}
 \end{frame}
 \begin{frame}[fragile]
-\frametitle{Reading \typ{pendulum.txt}}
-\begin{lstlisting}
-In []: L = []
-In []: T = []
-In []: for line in open('pendulum.txt'):
-....     points = line.split()
-....     L.append(float(points[0]))
-....     T.append(float(points[1]))
-\end{lstlisting}
-\begin{itemize}
-\item We now have two lists L and T
-\item Now, repeat previous steps for plotting
-\end{itemize}
-\end{frame}
-\begin{frame}[fragile]
 \frametitle{Plotting from \typ{pendulum.txt}}
-\begin{lstlisting}
+Open a new script and type the following:
-In []: TSq = []
+\begin{lstlisting}
+l = []
-In []: for t in T:
+t = []
-....:     TSq.append(t*t)
+for line in open('pendulum.txt'):
+points = line.split()
-In []: plot(L, TSq, '.')
+l.append(float(points[0]))
-\end{lstlisting}
+t.append(float(points[1]))
+tsq = []
+for time in t:
+tsq.append(time*time)
+plot(l, tsq, '.')
+\end{lstlisting}
+\end{frame}
+\begin{frame}
+\frametitle{Save and run}
+\begin{itemize}
+\item Save as pendulum\_plot.py.
+\item Run using \kwrd{\%run -i pendulum\_plot.py}
+\end{itemize}
 \end{frame}
 \begin{frame}[fragile]
 \begin{figure}
 \includegraphics[width=3.5in]{data/L-Tsq.png}
 \end{figure}
 \end{frame}
 \begin{frame}[fragile]
 \frametitle{Reading files \ldots}
-\typ{In []: for line in open('pendulum.txt'):}
+\typ{for line in open('pendulum.txt'):}
 \begin{itemize}
 \item opening file `\typ{pendulum.txt}'
 \item reading the file line by line
 \item \typ{line} is a \kwrd{string}
 \end{itemize}
 \end{lstlisting}
 \end{frame}
 \begin{frame}[fragile]
 \frametitle{Let's review the code}
-\begin{small}
+\begin{lstlisting}
-\begin{lstlisting}
+l = []
-In []: L = []
+t = []
-In []: T = []
+for line in open('pendulum.txt'):
-In []: for line in open('pendulum.txt'):
+points = line.split()
-....     points = line.split()
+l.append(float(points[0]))
-....     L.append(float(points[0]))
+t.append(float(points[1]))
-....     T.append(float(points[1]))
+tsq = []
+for time in t:
-In []: TSq = []
+tsq.append(time*time)
+plot(l, tsq, '.')
-In []: for t in T:
+\end{lstlisting}
-....:     TSq.append(t*t)
-In []: plot(L, TSq, '.')
-\end{lstlisting}
-\end{small}
 \end{frame}
 \begin{frame}[fragile]
 \begin{figure}
 \includegraphics[width=3.5in]{data/L-Tsq.png}

changeset 290	10528e3073ef
parent 286	ac457f7d1702
child 293	f7d7b5565232