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Let's pick MATLAB's brain on how to make a plot.

Home (tab) > Help > Documentation > ( contents tab) > matlab > getting started > graphics > using basic plotting functionsSearch: Plotting Functions

Note that you can access this exact page without using the search field. Doing this will give you a sense of how to navigate the documentation. 

Home (tab) > Help > Documentation > MATLAB > Graphics > 2-D and 3-D Plots > Plotting Basics > Plotting Functions

This page contains These help pages contain a lucid description of the extensive plotting capabilities available in MATLAB. When looking for plotting help, this would be the first place to turn to.

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Click the Run icon in the Editor. The underscore symbol (_) gives subscripts and \sigma gives the corresponding Greek symbol. SeeHelp > Index (tab) > Greek letters and mathematical symbols 

See my entire program here (right click and select save target as, or just left-click and copy-paste in the editor).

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