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IAN HUTCHINSON: Let's
just finish this

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off by cleaning up this
plot and saving it.

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In the first case, I don't
have any labels on my axes.

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That's bad.

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Let me put some
labels on my axes.

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X-label is the way you do this.

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And in this case I have a
very simple label that I want.

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And the same thing,
presumably for Y-label.

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That will at least
put some labels on.

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Aren't they horribly small?

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But they are there.

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Now, I want to improve
this plot in general.

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Let me point out another
thing that I want to do.

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I don't want to have
hold on permanently,

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so let me put hold off
after the second plot.

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And that's going to avoid
difficulties in the future.

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So I'm just going to save that.

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Now in order to improve
the size of the labels

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and so forth that's
involved with this,

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there are a number
of things one can do.

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And in general, I'm going to
do this for many of my plots.

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And so what I want
to do is I want

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to illustrate the fact
that my script-- which

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is called fitting.m,
can call another script.

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And it can call as
many scripts as I like.

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The script I'm going to call,
I have in my editor already.

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It's called plot defaults.

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Plot defaults.m.

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And here are some
mysterious calls

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that you will find out
only by reading the help

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files in general.

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By the way, in Octave
there's all kinds of help

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that you can find out by
typing things like, help.

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But in general it's more
useful usually to use doc.

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And so we could do
doc, let's say a plat

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and it would then
bring me to a place

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in the documentation, where
the documentation for plot

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is described.

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MathLab has got
its own help system

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and you can use that to
look up various things.

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I could do doc of,
let's say, set,

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and it will show
me what these set

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commands that are in this
file plot defaults are doing.

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The syntax is
complicated and it's not

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worth us dwelling
on it at the moment.

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Let me just explain
what it's going to do.

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First of all it's going to
set the default access label

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font size to be bigger, 20.

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Second thing it's
going to do is it's

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going to make the width of
the lines of the axes two

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instead of one because
the axes on these plots

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may well be better
if they're thicker.

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In general these plots tend to
come up with rather thin lines.

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That's useful generally, but the
most useful thing to fix these

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plots, and to get the labelling
to be a decent size turns out

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to be to shrink the size of
the plot leave the font size

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the same.

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So what this command
does is it basically

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sets the paper units, the paper
orientation, and the paper size

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to be three inches by four
inches, height versus width.

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And then it sets the paper
position in such a way

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that we aren't
writing off the paper.

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As I said, all of this is subtle
and you wouldn't necessarily

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want to know all
the details of this.

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I'll happily make this
file available to you.

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But all I have to do
in order to execute

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those commands in that
file, plot defaults,

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is write the command
plot defaults.

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And I'm going to do that
before my first plot.

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So plot defaults
should read in that

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file that I was just
looking at, this file,

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and execute the commands in it.

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Notice, by the way,
comments, very important.

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Because these commands
are mysterious,

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I put some commentary
to remind you

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what they're supposed to
be doing next to them,

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and the way the
comment is defined

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is by having a percent line
at the beginning of the line,

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or actually anywhere else
in the line for that matter.

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OK.

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Let's save this new
file and run it again.

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And lo and behold it's run.

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Probably-- I may not have
several of the defaults right

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because I've been doing a
number of things in this Octave

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session.

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If I get tired of
this Octave session--

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I've run 25 different commands
on it, it's telling me--

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and I want to
start a fresh, it's

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sometimes helpful to start
a new, fresh session.

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I can do this very
straightforwardly,

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we're just saying, exit, and
then starting over again.

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That's one way to be sure you've
got a nice, fresh session.

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One of the nicest
things about Octave

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is it actually still remembers
what your commands were,

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even though you've
got a new session.

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So here's what the plot
looks like, in the case

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when I run it with plot
defaults and executed before any

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of other plotting commands.

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So the plot defaults needs to
happen before anything else.

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And now what you see is
much better, much bigger

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at any rate labels on the
axes, et cetera, et cetera.

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Things aren't perfect.

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There's a little y is crashed
with the x there, but anyway.

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You can tweak around with
those to your heart's content.

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If this were fine, my final
plot, what I wanted to save,

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one of the ways I
could save it would

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be to do some kind of screen
capture on this window

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that I'm plotting it in.

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That would give me a rather
cumbersome and not very pretty

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plot.

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There is another way of
plotting, of saving this plot.

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And that is to use
the command print.

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So print is actually
printing out the plotting.

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One has to tell print
what format one wants.

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Supposing I want EPS
format, I could say D EPS.

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And suppose that I know what
file I want to save it into,

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I could, for example, write
fitted.EPS, like that.

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So this tells it to print out
this plot into an EPS file,

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which is then named fitted.EPS.

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Let's see what happens.

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Nothing obvious,
except that if I now

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look in the directory, which in
Octave I can do by typing LS,

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there is a file
called fitted EPS.

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I don't want to get out
of my Octave session.

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I'm in the same directory here.

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Here it is, fitted EPS.

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Let's have a look at that
file using ghost view,

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and there it is.

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This is now a good quality
file that I might be

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proud to show to my professor.

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It's actually not in color.

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That's because I use EPS.

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I think it's EPS C for color.

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Let me try it.

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Let's run that again and now
look at it again, and see,

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yes, it's color.

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Now it's color.

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So that's how to get
a plot and to save

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it looking halfway decent.

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And that's where we'll end.