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Any line beginning with a % will be skipped over by MATLAB; these are for human eyes only. You should libreally add comments to your program to remind yourself what it does. Otherwise, a few months (or days!) down the line, you'll look at it, wonder what all the fuss is about and curse the ^&^*%%&* author.

Tip: To comment multiples lines at once, highlight the text then either click on the comment button, right-click and select comment or press Ctrl-R. You can uncomment in a similar manner. 

I hear you saying "this is a piece of cake, gimme more!". So let's move on to Step 2.

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