GNU Octave

Time for action – testing with peaks

1. You can enter the interactive environment by typing octave in your shell under GNU/Linux, or by double-clicking the Octave icon in Windows. You should now see the Octave prompt:

   octave:1>
   

2. You have already learned how to exit the interactive environment. Simply give Octave the command exit or press Ctrl + D, but we do not want to exit just yet!
3. At the prompt, type as follows:

   octave:1> surf(peaks)
   

4. You should now see a three-dimensional surface plot as depicted on the left-hand side figure shown next. If not, your installation has not been successful. Now, put your mouse pointer over the figure window, hold the left mouse button down, and move the pointer. If the plotting program supports it, the figure should ...