diff -r 9c9be698d7ad -r 0ad8566e98ff day1/session6.tex --- a/day1/session6.tex Thu Nov 05 09:18:00 2009 +0530 +++ b/day1/session6.tex Thu Nov 05 09:21:11 2009 +0530 @@ -226,18 +226,18 @@ %% \end{lstlisting} %% \end{frame} -\begin{frame}[fragile] -\frametitle{Bisection Method} -\begin{enumerate} -\item Start with the given interval $(-\pi/2, \pi/2)$ ($(a, b)$) -\item $f(a)\cdot f(b) < 0$ -\item Bisect the interval. $c = \frac{a+b}{2}$ -\item Change the interval to $(a, c)$ if $f(a)\cdot f(c) < 0$ -\item Else, change the interval to $(c, b)$ -\item Go back to 3 until $(b-a) \le$ tolerance -\end{enumerate} -\alert{\typ{tolerance = 1e-5}} -\end{frame} +%% \begin{frame}[fragile] +%% \frametitle{Bisection Method} +%% \begin{enumerate} +%% \item Start with the given interval $(-\pi/2, \pi/2)$ ($(a, b)$) +%% \item $f(a)\cdot f(b) < 0$ +%% \item Bisect the interval. $c = \frac{a+b}{2}$ +%% \item Change the interval to $(a, c)$ if $f(a)\cdot f(c) < 0$ +%% \item Else, change the interval to $(c, b)$ +%% \item Go back to 3 until $(b-a) \le$ tolerance +%% \end{enumerate} +%% \alert{\typ{tolerance = 1e-5}} +%% \end{frame} %% \begin{frame}[fragile] %% \frametitle{Bisection \dots} @@ -255,15 +255,15 @@ %% \end{lstlisting} %% \end{frame} -\begin{frame}[fragile] -\frametitle{Newton-Raphson Method} -\begin{enumerate} -\item Start with an initial guess of x for the root -\item $\Delta x = -f(x)/f^{'}(x)$ -\item $ x \leftarrow x + \Delta x$ -\item Go back to 2 until $|\Delta x| \le$ tolerance -\end{enumerate} -\end{frame} +%% \begin{frame}[fragile] +%% \frametitle{Newton-Raphson Method} +%% \begin{enumerate} +%% \item Start with an initial guess of x for the root +%% \item $\Delta x = -f(x)/f^{'}(x)$ +%% \item $ x \leftarrow x + \Delta x$ +%% \item Go back to 2 until $|\Delta x| \le$ tolerance +%% \end{enumerate} +%% \end{frame} %% \begin{frame}[fragile] %% \frametitle{Newton-Raphson \dots} @@ -290,41 +290,41 @@ %% \end{itemize} %% \end{frame} -\begin{frame}[fragile] -\frametitle{Initial Estimates} -\begin{itemize} -\item Given an interval -\item How to find \alert{all} the roots? -\end{itemize} -\begin{enumerate} -\item Check for change of signs of $f(x)$ in the given interval -\item A root lies in the interval where the sign change occurs -\end{enumerate} -\end{frame} +%% \begin{frame}[fragile] +%% \frametitle{Initial Estimates} +%% \begin{itemize} +%% \item Given an interval +%% \item How to find \alert{all} the roots? +%% \end{itemize} +%% \begin{enumerate} +%% \item Check for change of signs of $f(x)$ in the given interval +%% \item A root lies in the interval where the sign change occurs +%% \end{enumerate} +%% \end{frame} -\begin{frame}[fragile] -\frametitle{Initial Estimates \ldots} -\begin{lstlisting} -In []: def our_f(x): - ....: return cos(x) - x*x - ....: -In []: x = linspace(-pi/2, pi/2, 11) -In []: y = our_f(x) -\end{lstlisting} -Get the intervals of x, where sign changes occur -\end{frame} +%% \begin{frame}[fragile] +%% \frametitle{Initial Estimates \ldots} +%% \begin{lstlisting} +%% In []: def our_f(x): +%% ....: return cos(x) - x*x +%% ....: +%% In []: x = linspace(-pi/2, pi/2, 11) +%% In []: y = our_f(x) +%% \end{lstlisting} +%% Get the intervals of x, where sign changes occur +%% \end{frame} -\begin{frame}[fragile] -\frametitle{Initial Estimates \ldots} -\begin{lstlisting} -In []: pos = y[:-1]*y[1:] < 0 -In []: rpos = zeros(x.shape, dtype=bool) -In []: rpos[:-1] = pos -In []: rpos[1:] += pos -In []: rts = x[rpos] -\end{lstlisting} -Now use Newton-Raphson? -\end{frame} +%% \begin{frame}[fragile] +%% \frametitle{Initial Estimates \ldots} +%% \begin{lstlisting} +%% In []: pos = y[:-1]*y[1:] < 0 +%% In []: rpos = zeros(x.shape, dtype=bool) +%% In []: rpos[:-1] = pos +%% In []: rpos[1:] += pos +%% In []: rts = x[rpos] +%% \end{lstlisting} +%% Now use Newton-Raphson? +%% \end{frame} \begin{frame}[fragile] @@ -355,29 +355,24 @@ \end{lstlisting} \end{frame} -\begin{frame}[fragile] -\frametitle{Scipy Methods \dots} -\begin{small} -\begin{lstlisting} -In []: from scipy.optimize import fixed_point +%% \begin{frame}[fragile] +%% \frametitle{Scipy Methods \dots} +%% \begin{small} +%% \begin{lstlisting} +%% In []: from scipy.optimize import fixed_point -In []: from scipy.optimize import bisect +%% In []: from scipy.optimize import bisect -In []: from scipy.optimize import newton -\end{lstlisting} -\end{small} -\end{frame} +%% In []: from scipy.optimize import newton +%% \end{lstlisting} +%% \end{small} +%% \end{frame} \begin{frame} \frametitle{Things we have learned} \begin{itemize} \item Solving ODEs \item Finding Roots - \begin{itemize} - \item Estimating Interval - \item Newton-Raphson - \item Scipy methods - \end{itemize} \end{itemize} \end{frame}