How do I upload data into Matlab GUI

I'm making a Matlab GUI that downloads data from a txt file(3 columns), and finds the mean, median, maximum, and minimum of each column. I'm trying to figure out what the code to download the file into my graph, as well as code each other part.

Answer 1

[Image Analyst]

You could use plot(), bar(), surf(), imshow() or any number of other plotting and display functions. See the MATLAB Gallery for some visualization options that you might want to use.