This channel contains a series of videos which demonstrate the use of Excel and Matlab for problem solving. I use most of these videos in a distance course I teach to graduate-level engineers. It presumes some basic understanding of calculus and experience with the basic elements of both Excel and Matlab. The approach here is very applied and I do not spend a great deal of time covering the theory behind the algorithms. If you want more theory, look for a basic numerical analysis course. In many cases supporting files, such as spreadsheets and m-files, can be found at the link below.