[header] How to graph in matlab [title] Know a few things about matlab. [substeps] Semi-colon operator: if a command is followed by a' ;' then the output will not be printed on the screen. This is trivial when the output is a short assignment, like y = 1, but becomes problematic if a large matrix is created. 
Also, any time that an output is desired, like a graph, the semicolon should be omitted. Clear command: there are a few useful command window commands.