Support:Documents:Examples:Instructions for Adding Your Own Example

Write some introduction to your example here.

For text that you want to appear as part of a MATLAB function or program, encase it inside a "pre" block.
Line 2 of pre block
    Line 3 (indented) of pre block.

Remember to include figures and plots in your example to make it look pretty and convey information. To insert a figure, create a figure file in png (preferred) or other graphic format.

figure
plot(1:10)
title('Example Figure')
ylabel('y-axis label')
xlabel('x-axis label')
set(1,'PaperPosition',[0.25 2.5 3 2])
print -dpng ExampleFigure.png

Next, upload the image file ("upload file" at the bottom of any wiki page) giving it a unique name.

Use double-square brackets to insert the figure into the page

That is it. It is so simple that even a caveman (or professor) can do it.