Begin with Existing Code
Create M-Files from Command Window and History
Before you begin writing MATLAB code in a blank file, consider
starting with existing resources for the code, and then use the MATLAB Editor
to modify the code.
You create and run MATLAB statements in the Command Window,
modify those statements to your satisfaction, and then create an M-file
that includes the statements. To facilitate this process, in the Command History,
select the MATLAB statements you want to include in the M-file.
Right-click and select Create M-File.
The Editor opens a new file that includes the statements you selected
from the Command History. You can also copy the statements from the
Command History and paste them into an existing M-file.
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Use Existing M-Files and Examples
If you can find existing M-files that accomplish what you want
to do, copy, and use the code in your own M-file, assuming you have
legal permission to do so. Following are some resources you can use.
MATLAB and Toolbox Functions
You can access and reuse the code in most MATLAB and toolbox
functions that have a .m file extension. You cannot
use MATLAB and toolbox functions that are built-in. They are
efficient but their code is not accessible.
If there is a MATLAB function that is similar to what you
need to do and it is not built-in, open the file in the Editor and
use it as a basis for your file. Be sure to save the file using a
different name and in a folder that is not in matlabroot/toolbox.
See Saving M-Files for details.
Demos and Examples
The MATLAB product and its toolboxes include demonstration
programs. You can view the code in the demos and copy it for use in
your own M-files. To see the demos, type demo,
which opens the Help browser to the Demos pane.
For more information about demos, see Using Demos and Code Examples.
There are also code examples in the online documentation. To
see a list of examples for a product, type helpbrowser to
open the Help browser. In the Contents pane,
click + for a product to view the
help topics, and then select the
Examples entry.
File Exchange
File Exchange enables
you to use files that were created by other users. To save time and
get new ideas, consider seeing if someone has already provided a file
similar to what you need before creating a new file. In addition,
consider submitting files you create for others to use. For more information,
see File Exchange — Finding and Getting Files Created by
Other Users".
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 | Editing and Debugging M-Files | | Ways to Edit, Evaluate, and Debug M-Files |  |
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