How do I launch MatLab?

1. Login to the main server engsoc.org
2. Run MatLab

   matlab

This program is actually a free replacement to Matlab called Octave. It is licensed under the GPL and more information is available at http://www.octave.org.

Now to get started. How do I perform matrix reductions in MatLab?

1. Run MatLab
2. Enter your matrix

   1 2 3 4 5 6 7 8 9

   into matlab like this:

   a = [1 2 3; 4 5 6; 7 8 9]

3. Generate the Row Reduced Echleon Form like so:

   b = rref(a)

4. The result is this:

   b = 1.00000 0.00000 -1.00000 0.00000 1.00000 2.00000 0.00000 0.00000 0.00000

How do I add matricies?

1. Launch MatLab
2. Enter your matrix

   1 2 3 4 5 6 7 8 9

   
   

   7 8 9 1 2 3 4 5 6

   into matlab like this:

   a = [1 2 3; 4 5 6; 7 8 9] b = [7 8 9; 1 2 3; 4 5 6]

3. Add the two like this:

   c = a + b

4. The result is this:

   c = 8 10 12 5 7 9 11 13 15

How do I subtract matricies?

1. Launch MatLab
2. Enter your matrix

   1 2 3 4 5 6 7 8 9

   
   

   7 8 9 1 2 3 4 5 6

   into matlab like this:

   a = [1 2 3; 4 5 6; 7 8 9] b = [7 8 9; 1 2 3; 4 5 6]

3. Add the two like this:

   c = a - b

4. The result is this:

   c = -6 -6 -6 3 3 3 3 3 3

How do I do a pointwise multiplication of two matricies?

1. Launch MatLab
2. Enter your matrix

   1 2 3 4 5 6 7 8 9

   
   

   7 8 9 1 2 3 4 5 6

   into matlab like this:

   a = [1 2 3; 4 5 6; 7 8 9] b = [7 8 9; 1 2 3; 4 5 6]

3. Add the two like this:

   c = a .* b

4. The result is this:

   c = 7 16 27 4 10 18 28 40 54

How do I do a matrix multiplication?

1. Launch MatLab
2. Enter your matrix

   1 2 3 4 5 6 7 8 9

   
   

   7 8 9 1 2 3 4 5 6

   into matlab like this:

   a = [1 2 3; 4 5 6; 7 8 9] b = [7 8 9; 1 2 3; 4 5 6]

3. Add the two like this:

   c = a * b

4. The result is this:

   c = 21 27 33 57 72 87 93 117 141

How do I do a pointwise division of two matricies?

1. Launch MatLab
2. Enter your matrix

   1 2 3 4 5 6 7 8 9

   
   

   7 8 9 1 2 3 4 5 6

   into matlab like this:

   a = [1 2 3; 4 5 6; 7 8 9] b = [7 8 9; 1 2 3; 4 5 6]

3. Divide like this:

   c = a ./ b

4. The result is this:

   c = 0.14286 0.25000 0.33333 4.00000 2.50000 2.00000 1.75000 1.60000 1.50000

How do I do a matrix division?

1. Launch MatLab
2. Enter your matrix

   1 2 3 4 5 6 7 8 9

   
   

   7 8 9 1 2 3 4 5 6

   into matlab like this:

   a = [1 2 3; 4 5 6; 7 8 9] b = [7 8 9; 1 2 3; 4 5 6]

3. Divide like this:

   c = a / b

4. The result is this:

   c = -0.16667 0.83333 0.33333 0.33333 0.33333 0.33333 0.83333 -0.16667 0.33333

How do I find the inverse matrix?

1. Launch MatLab
2. Enter your matrix

   1 2 3 4 5 6 7 8 9

   into matlab like this:

   a = [1 2 3; 4 5 6; 7 8 9]

3. Invert the matrix like this:

   b = inv(a)

4. The result is this:

   b = 3.1522e+15 -6.3044e+15 3.1522e+15 -6.3044e+15 1.2609e+16 -6.3044e+15 3.1522e+15 -6.3044e+15 3.1522e+15

How do I plot a graph?

1. If you're in PAL/Leos:
   Click on this link to allow remote applications to be diplayed on this computer.
2. If you're using any other UNIX machine run this command:

   xhost +engsoc.org

   This is needed to view the graph.
3. If you're using a Windows machine, you have to save the plot to a file
4. Launch MatLab.
5. Run these commands to generate this plot

   a = [0 1 2 3 4 5 6 7 8 9]; b = sin(a); plot(b);

6. Run these commands to generate this plot

   a = [0 1 2 3 4 5 6 7 8 9]; b = sin(a); plot(b,'.');

7. Run these commands to generate this plot

   a = [0 1 2 3 4 5 6 7 8 9]; b = sin(a); plot(b,'x');

How do I import a plot into my report?

1. Launch MatLab.
2. Execute these commands before any others:

   gset terminal png; gset output "myPlot.png";

   where myPlot.png the is name of the file to create everytime the plot() command is called.
3. After you use the plot() command, quit MatLab and run this command:

   mv myPlot.png ~/public_html

   where myPlot.png the is name of the file created in MatLab when the plot() command was called.
   
4. Assuming you're using MicrosOft Word
   1. Insert --> Picture --> From file
   2. Enter this File name:

      http://www.engsoc.org/~username/myPlot.png

      where username is your EngSoc username.

How do I exit MatLab?

1. Execute this command:

   quit