Matlab script and function m-files

MATLAB Script Files

• Lect 19 P.

• Winter Quarter

• When the file is not in the current working directory, a cd or chdir command may be issued to change the directory.
• >> cd a:\ % Make a:\ the current working directory
• >> d13

MATLAB Demo

• Lect 19 P.

• Winter Quarter

• %MATLAB Example use of ginput
• clear, clf, hold off
• axis ([0, 10, 0, 10])
• hold on
• plot ([1, 2, 2, 1, 1],[2, 2, 3, 3, 2])
• text (1, 1.6, 'Click inside box to quit')
• while 1
• [x, y, buttun] = ginput (1)
• if buttun == 1, plot (x, y, '+r'), end
• if buttun == 2, plot (x, y, 'oy'), end
• if buttun == 3, plot (x, y, '*g'), end
• if x > 1 & x < 2 & y > 2 & y < 3, break; end
• end
• hold off

MATLAB Function Files

• Lect 19 P.

• Winter Quarter

• A MATLAB function file (called an M-file) is a text (plain ASCII) file that contains a MATLAB function and, optionally, comments.
• The file is saved with the function name and the usual MATLAB script file extension, ".m".
• A MATLAB function may be called from the command line or from any other M-file.

MATLAB Function Files

• Lect 19 P.

• Winter Quarter

• When the function is called in MATLAB, the file is accessed, the function is executed, and control is returned to the MATLAB workspace.
• Since the function is not part of the MATLAB workspace, its variables and their values are not known after control is returned.
• Any values to be returned must be specified in the function syntax.