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\documentclass[12pt]{article}
%\title{Plotting Data}
%\author{FOSSEE}
\begin{document}
\date{}
\vspace{-1in}
\begin{center}
\LARGE{Plotting Data}\\
\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}
\end{document}
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