1. MATLAB How to use (using M-files)
Search and open the current installed
version of Matlab.
Matlab updates twice a year with an
‘a’ and ‘b’ addition. Here we are using 2015b
Open “MATLAB R2015b”
Don’t open the Activate or Deactivate option

2. This is the interactive Matlab window that will appear.

3. Change the directory as shown:
CLICK HERE
CLICK on DESKTOP

4. How do you start a new M-file in MATLAB window.
Do the following: File > New > M-file
Click “HOME” Tab
Click “New Script”

5. This is the panel that you get to type in your program (codes).
The panels can be rearranged or made into separate windows.

6. Type in your program codes in this window.

7. Save your m-files by doing:
* Indicated not yet saved
Click on “EDITOR” tab
Click on “Save”
Set Directory, before we set
the working directory to Desktop
So save the file there as well
Enter a filename
Do not use spaces
It will be saved as a “.m” file

8. You will have “sample_code.m”
Saved to Desktop
Directory is Desktop
Shows folder the directory points to
That now should have the saved file

9. After saving your M-file, you need to run it
Click “EDITOR” tab
Click “Run”

10. See error at Line 3
Fix typo from “cost” to “cos”

11. Re-run and a window will open up with the plot of the three functions, X,Y, Z.
Notice that your graph has no title, use “help” command in the
MATLAB window to learn how you can add title.

12. Type in “help plot” in the Command Window and hit enter

13. >> help plot
PLOT Linear plot.
PLOT(X,Y) plots vector Y versus vector X. If X or Y is a matrix,
then the vector is plotted versus the rows or columns of the matrix,
whichever line up. If X is a scalar and Y is a vector, length(Y)
disconnected points are plotted.
PLOT(Y) plots the columns of Y versus their index.
If Y is complex, PLOT(Y) is equivalent to PLOT(real(Y),imag(Y)).
In all other uses of PLOT, the imaginary part is ignored.
Various line types, plot symbols and colors may be obtained with
PLOT(X,Y,S) where S is a character string made from one element
from any or all the following 3 columns:
b blue point solid
g green o circle : dotted
r red x x-mark dashdot
c cyan plus dashed
m magenta * star
y yellow s square
k black d diamond
v triangle (down)
^ triangle (up)
< triangle (left)
> triangle (right)
p pentagram
h hexagram

14. The rest of the results when you type “help plot”– read and learn.
For example, PLOT(X,Y,'c+:') plots a cyan dotted line with a plus
at each data point; PLOT(X,Y,'bd') plots blue diamond at each data
point but does not draw any line.
PLOT(X1,Y1,S1,X2,Y2,S2,X3,Y3,S3,...) combines the plots defined by
the (X,Y,S) triples, where the X's and Y's are vectors or matrices
and the S's are strings.
For example, PLOT(X,Y,'y-',X,Y,'go') plots the data twice, with a
solid yellow line interpolating green circles at the data points.
The PLOT command, if no color is specified, makes automatic use of
the colors specified by the axes ColorOrder property. The default
ColorOrder is listed in the table above for color systems where the
default is blue for one line, and for multiple lines, to cycle
through the first six colors in the table. For monochrome systems,
PLOT cycles over the axes LineStyleOrder property.
PLOT returns a column vector of handles to LINE objects, one
handle per line.
The X,Y pairs, or X,Y,S triples, can be followed by
parameter/value pairs to specify additional properties
of the lines.
See also SEMILOGX, SEMILOGY, LOGLOG, PLOTYY, GRID, CLF, CLC, TITLE,
XLABEL, YLABEL, AXIS, AXES, HOLD, COLORDEF, LEGEND, SUBPLOT, STEM.
>>

15. Find out how you can use “title” command
to add title to your figure. Type “help title”
>> help title
TITLE Graph title.
TITLE('text') adds text at the top of the current axis.
See also XLABEL, YLABEL, ZLABEL, TEXT.

16. After you learn how to use “title” command, use it in your program

17. See the result of using “title” command in your program

18. Simple Exercise:
Run the following program, using the guidelines
provided in earlier slides.
Include title, xlabel, ylabel
Use help command if necessary
Show output on the monitor to your TA
t=0:pi/100:2*pi; %comments start with percent sign '%'
y=sin(t); %';' semicolons suppress the output
z=cos(t);
x=(cos(t)).^2;
plot(t,y,t,z,t,x)