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Lesson: a Matlab Plot (creating and printing figures)

You'll
learn
to make simple MATLAB plots and print them out.
This lesson teaches you the most basic graphic commands.
If you end an instruction with ';',
you will not see the output for
that instruction. MATLAB keeps the results in memory until you let the
results out.
Follow this example, stepbystep.

The video shows you the main idea. Below the video, you can see all the
details of the code...
In the command window, you first create a variable named
'angle' and
assign 360 values, from 0 to 2*pi (the constant 'pi' is already
defined in
MATLAB):
>> angle = linspace(0,2*pi,360);
Now, create appropriate horizontal
and vertical
values for those angles:
>> x=cos(angle);
>> y=sin(angle);
Then, draw
those (x,y) created
coordinates:
>> plot(x,y)
Set the scales of the two axes
to be the same:
>> axis('equal')
Put a title
on the figure:
>> title('Pretty Circle')
Label the xaxis
and the yaxis
with something explanatory:
>> ylabel('y')
>> xlabel('x')
Gridding
the plot is always optional but valuable:
>> grid on
You now see the figure:
The 'print'
command sends the current plot to the printer connected to
your
computer:
>> print
The arguments of the axis,
title,
xlabel,
and ylabel
commands are text
strings. Text strings are entered within single quotes (').
Do you like your plot? Interesting and funny, isn't it?
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