I am learning LaTex and I was wondering if there's a way to create graphs and figures with it. Even if it's not as simple as just typing graph sin(x) somewhere. I've been reading online about it and I think you actually can't, but then again I see documents like these (http://ocw.mit.edu/courses/mathemat...ble-calculus-fall-2006/lecture-notes/lec1.pdf) all the time and I wonder how are the figures integrated with the document. Assuming that document was created with LaTex, otherwise what was it created with? I know for a fact you can actually import images into documents, but that is too definitive. I want something that I can change later with ease. I am not looking for complex 3D graphs like the ones you would get with MATLAB or mathematica. Just simple figures like the ones in the example above.