--- a/day1/cheatsheet2.tex Tue Dec 29 19:02:01 2009 +0530
+++ b/day1/cheatsheet2.tex Tue Dec 29 19:25:11 2009 +0530
@@ -25,87 +25,135 @@
\LARGE{Plotting Points}\\
\large{FOSSEE}
\end{center}
-\section{Plotting from Data files}
-\begin{verbatim}
-l = [] #Empty List
-t = []
-for line in open('pendulum.txt'): # Opening & Reading files
- points = line.split() # Splitting a string
- l.append(float(points[0])) # Appending to a list
- t.append(float(points[1]))
-tsq = []
-for time in t: #Iterating through lists
- tsq.append(t*t)
-plot(l, tsq, '.') # Plotting points
-\end{verbatim}
+
\section{Plotting Points with Lists}
\begin{lstlisting}
-In [1]: x = [0, 1, 2, 3]
-In [2]: y = [7, 11, 15, 19]
-In [3]: plot(x, y)
-In [4]: clf()
-In [5]: plot(x, y, 'o') # Plotting Circles
-#Dots - '.', #Dashed lines - '--' #Lines - '-'
+In []: x = [0, 1, 2, 3] # Creating a list
+In []: y = [7, 11, 15, 19]
+In []: plot(x, y)
+In []: clf()
+In []: plot(x, y, 'o') # Plotting Circles
\end{lstlisting}
+\subsection{Line style/marker}
+\begin{lstlisting}
+The following format string characters are accepted
+to control the line style or marker:
+
+ ================ ===============================
+ character description
+ ================ ===============================
+ '-' solid line style
+ '--' dashed line style
+ '-.' dash-dot line style
+ ':' dotted line style
+ '.' point marker
+ ',' pixel marker
+ 'o' circle marker
+ 'v' triangle_down marker
+ '^' triangle_up marker
+ '<' triangle_left marker
+ '>' triangle_right marker
+ '1' tri_down marker
+ '2' tri_up marker
+ '3' tri_left marker
+ '4' tri_right marker
+ 's' square marker
+ 'p' pentagon marker
+ '*' star marker
+ 'h' hexagon1 marker
+ 'H' hexagon2 marker
+ '+' plus marker
+ 'x' x marker
+ 'D' diamond marker
+ 'd' thin_diamond marker
+ '|' vline marker
+ '_' hline marker
+ ================ ===============================
+
+\end{lstlisting}
+
+\subsection{Marker combinations}
+\typ{In []: plot(x, y, 'ro')} \\
+This plots figure with red colored filled circles.\\
+Similarly other combination of colors and marker can be used.
\section{Lists}
Initializing
\begin{lstlisting}
-In [10]: mtlist = [] # Empty List
-In [11]: lst = [ 1, 2, 3, 4, 5]
+In []: mtlist = [] # Empty List
+In []: lst = [ 1, 2, 3, 4, 5]
\end{lstlisting}
Slicing
\begin{lstlisting}
-In [12]: lst[1:3] # A slice.
-Out[12]: [2, 3]
+In []: lst[1:3] # A slice.
+Out[]: [2, 3]
-In [13]: lst[1:-1]
-Out[13]: [2, 3, 4]
+In []: lst[1:-1]
+Out[]: [2, 3, 4]
\end{lstlisting}
-Appending to lists
+\subsection{Appending to lists}
\begin{lstlisting}
-In [14]: a = [ 6, 7, 8, 9]
-In [15]: b = lst + a
-In [16]: b
-Out[16]: [1, 2, 3, 4, 5, 6, 7, 8, 9]
+In []: a = [ 6, 7, 8, 9]
+In []: b = lst + a
+In []: b
+Out[]: [1, 2, 3, 4, 5, 6, 7, 8, 9]
-In [17]: lst.append(6)
-In [18]: lst
-Out[18]: [ 1, 2, 3, 4, 5, 6]
+In []: lst.append(6)
+In []: lst
+Out[]: [ 1, 2, 3, 4, 5, 6]
\end{lstlisting}
-
-Iterating over a List
+\subsection{Iterating over a List}
\begin{lstlisting}
-In [19]: for each in b: # Iterating over the list, element-wise
- ....: print b # Print each element
+In []: for element in b: # Iterating over the list, element-wise
+ ....: print element # Print each element
....:
\end{lstlisting}
-Splitting Strings
+\section{Strings}
+\subsection{Splitting Strings}
\begin{lstlisting}
-In [20]: line = '1.2000e-01 7.4252e-01'
-In [21]: point = line.split() # Splits the string at the space
-Out[21]: ['1.2000e-01', '7.4252e-01']
+In []: greet = ``hello world''
+In []: print greet.split()
+Out[]: ['hello', 'world']
+In []: greet = ``hello, world''
+In []: print greet.split(',')
+Out[]: ['hello', ' world'] # Note the whitespace before 'world'
+\end{lstlisting}
+A string can be split based on the delimiter specified within quotes. A combination of more than one delimiter can also be used.\\
+\typ{In []: greet.split(', ')}\\
+\typ{Out[]: ['hello', 'world']}\\Note the whitespace is not there anymore.
+\newpage
+\section{Plotting from Files}
+\subsection{Opening files}
+
+\typ{In []: f = open('datafile.txt')}\\By default opens in read mode. \\If file does not exist then it throws an exception\\
+\typ{In []: f = open('datafile.txt','r')}\\Specifying the read mode\\
+\typ{In []: f = open('datafile.txt', 'w')}\\Opens the file in write mode. \\If the file already exists, then it deletes all the previous content and opens.
+
+\subsection{Reading from files}
+Just like lists files are iterable as well.
+
+\begin{lstlisting}
+ In []: for line in f:
+ ...: print line
+ ...:
+ ...:
\end{lstlisting}
-Plotting from Files
+\subsection{Plotting}
\begin{lstlisting}
-In [22]: L = []
-In [23]: T = []
-
-#Open a file & operate on each line
-In [24]: for line in open('pendulum.txt'):
- .... point = line.split()
- .... L.append(float(point[0]))
- .... T.append(float(point[1]))
-In [25]: TSq = []
-In [26]: for t in T:
- ....: TSq.append(t*t)
- ....:
- ....:
-In [27]: plot(L, TSq, '.')
+l = []
+t = []
+for line in open('pendulum.txt'):
+ point = line.split()
+ l.append(float(point[0]))
+ t.append(float(point[1]))
+tsq = []
+for time in t:
+ tsq.append(time*time)
+plot(l, tsq, '.')
\end{lstlisting}
\end{document}