# Matlab Publish

Matlab can be used purely as a command interface, but doing so uses only a tiny fraction of its power. A more powerful way to use Matlab is to create scripts and functions. These are ways to save the commands you want to run in a file, so that you can run them repeatedly, and edit them so that they work better.

One way in which Matlab has changed relatively recently is in its
treatment of scripts. We can save a collection of Matlab commands
in a file ending with the extension ".m". Then in Matlab we run
the `publish()` command, which creates an HTML page with the
same name as the script. We can then view that HTML using a browser.
The point is that this approach allows us to embed text and descriptions
in the web page that results, so as to describe the code and results
that come from it.

This process is best described through an example. We will create a script and publish it, viewing the results. First, we must type some Matlab commands into a file and save it. We open our favorite editor (which in this case is probably the Matlab editor itself) and type the following code.

%% Introduction to Matlab Publish % The publish() command in Matlab allows us to use script files to create % html documents, or other formats, which can include bodies of text to % describe what is going on, with the actual commands to make it happen % embedded in the document. The text mode makes use of the comment % character - the percent sign. Two adjacent percent signs starting a line % indicate the start of a cell of text. Text on the line with the two % percent signs is interpreted as a header. % % Here is an example of how we might use Matlab as a simple calculator. (3+4^2)/2.5

We see that the first line of code starts with two percent signs, indicating the start of a text cell. The text on the line with the two percent signs is interpreted as a heading. The text on lines with single percent signs is interpreted as ordinary descriptive text. Lines without percent signs are interpreted as Matlab commands.

Now we save this file with the name `sample.m`. If Matlab
is not open, we start it, and surf (using the `cd` command) to the
directory where sample.m is saved. Next we run the Matlab command
`publish('sample.m')` on the Matlab command line. This creates a new
subdirectory called `html`, which contains a file called
`sample.html`. If it is on our own computer
we can force our browser to locate to it by entering `file:///`
on the URL line of the browser, and surf around until we find that
html file.

At this point, we can make changes to the .m file in the editor, save the file, run the publish command above (using the up-arrow key!), and the reload the browser to see our results. We can write text copiously to describe what is being done in the script, or discuss the results that arise.

Assignment 6 is posted.

The midterm exam will take place on Friday,
12 October. As always, you are permitted any paper
notes you find useful, but no electronic devices are
allowed. The test is cumulative, but emphasizes
the material covered in the last fours weeks.
A sample exam is
available.

You need to install
Matlab
on your computer by Wednesday.
You do not need Simulink or any particular toolboxes, though
you might find the Symbolic toolbox useful at some time
in the future (not in this class).