Merge pull request #1517 from saaketp/master

Added a MATLAB book

free-programming-books.md

@@ -1304,6 +1304,7 @@ See also [TeX](#tex)
 
 
 ### MATLAB
+* [An Interactive Introduction to MATLAB](http://www.science.smith.edu/~jcardell/Courses/EGR326/Intro-to-MATLAB.pdf)
 * [An Introduction to MATLAB](http://www.maths.dundee.ac.uk/ftp/na-reports/MatlabNotes.pdf)
 * [Applications of MATLAB in Science and Engineering](http://www.intechopen.com/books/applications-of-matlab-in-science-and-engineering)
 * [Experiments with MATLAB](http://www.mathworks.com/moler/exm/index.html)