# 3. Tutorial Examples¶

To proceed with the tutorial examples, user is expected to have completed the software installation and data downloads from Section 1 (including nctiles_climatology/ and m_map/). The full suite of tutorial examples can then be executed via gcmfaces_demo.m by opening Matlab and typing

p = genpath('gcmfaces/'); addpath(p);

As prompted by gcmfaces_demo.m, specify the desired amount of explanatory text output. Various examples then proceed and display comments in the Matlab or Octave command window. The Matlab GUI and debugger can also be used to run each example line by line. This can be useful to learn more about the inner workings of gcmfaces functions.
The first section in gcmfaces_demo.m illustrates I/O and plotting capabilities (grid_load.m and example_display.m). The second section focuses on data processing capabilities such as interpolation and smoothing. example_interp.m interpolates fields to a lat-lon grid and vice versa. example_smooth.m integrates a diffusion equation which involves tracer gradient and flux convergence computations. The final section in gcmfaces_demo.m computes oceanic transports (example_transports.m).
Figure 3.1 Same as Figure 2.1 but plotted in geographical coordinates using m_map_gcmfaces.m. This plot is generated by calling example_display(4).