I am new to Mathematica so I would appreciate any help you can give me.
I have a file with numbers in 4 columns. I would like to read it into Mathematica and to plot the numbers in the file.
I tried using the Import function but I am not sure how to you use it
If I write
How can I use the numbers I imported? How can I extract only 1 column, 2 colums ..? and How can I plot the numbers ( the first 3 columns are r, theta, phi