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| -rw-r--r-- | loading-data-from-files.rst | 43 |
1 files changed, 15 insertions, 28 deletions
diff --git a/loading-data-from-files.rst b/loading-data-from-files.rst index 5196619..f67a8c3 100644 --- a/loading-data-from-files.rst +++ b/loading-data-from-files.rst @@ -6,28 +6,15 @@ Welcome to this tutorial on loading data from files. {{{ Screen shows welcome slide }}} -Until now, all the plots we have made use analytic functions. We have -been using analytic functions to generate a sequence of points and -plotting them, against another sequence of points. But, this is not -what we do most often. We often require to plot points obtained from -experimental observations. - -.. #[punch: the initial part of the paragraph may be removed, to make - this a more generic LO?] - -.. #[Nishanth]: The paragraph can be removed. - -In this tutorial we shall learn to read data from files and save it -into sequences that can later be used to plot. +We often require to plot points obtained from experimental +observations. In this tutorial we shall learn to read data from files +and save it into sequences that can later be used to plot. {{{ Show the outline for this tutorial }}} We shall use the ``loadtxt`` command to load data from files. We will -be looking at how to get multiple columns of data into multiple -sequences. - -.. #[Nishanth]: can be "How to read a file with multiple columns of - data and load each column of data into a sequence." +be looking at how to read a file with multiple columns of data and +load each column of data into a sequence. {{{ switch back to the terminal }}} @@ -38,16 +25,18 @@ As usual, let us start IPython, using Now, Let us begin with reading the file primes.txt, which contains just a list of primes listed in a column, using the loadtxt command. -The file, in our case, is present in ``/home/fossee/primes.txt``. +The file, in our case, is present in ``/home/fossee/primes.txt``. + +{{{ Navigate to the path in the OS, open the file and show it }}} .. #[punch: do we need a slide for showing the path?] -We use the ``cat`` command to see the contents of this file. +.. We use the ``cat`` command to see the contents of this file. -#[punch: should we show the cat command here? seems like a good place -to do it] :: +.. #[punch: should we show the cat command here? seems like a good place + to do it] :: - cat /home/fossee/primes.txt + cat /home/fossee/primes.txt .. #[Nishanth]: A problem for windows users. Should we simply open the file and show them the data @@ -118,7 +107,8 @@ Let us now, print the variables L and T, to see what they contain. Notice, that L and T now contain the first and second columns of data from the data file, ``pendulum.txt``, and they are both simple -sequences. +sequences. ``unpack=True`` has given us the two columns in to two +separate sequences instead of one complex sequence. {{{ show the slide with loadtxt --- other features }}} @@ -135,14 +125,12 @@ finished, resume the video to look at the solution. {{{ switch back to the terminal }}} :: - L, T = loadtxt('/home/fossee/pendulum.txt', unpack=True, delimiter=';') + L, T = loadtxt('/home/fossee/pendulum_semicolon.txt', unpack=True, delimiter=';') print L print T -.. #[Nishanth]: L, T = loadtxt('/home/fossee/pendulum_semicolon.txt', ...) - This brings us to the end of this tutorial. {{{ show the summary slide }}} @@ -156,4 +144,3 @@ You should now be able to do the following, comfortably. Thank you! - |