[Zz] M file execution efficiency

Master of MATLAB 7.0 hybrid programming, edited by Yang gaobo P30, Electronic Industry Press

M Files have convenient matrix and Array Operations, and have high programming efficiency, but low computing efficiency, that is, they are common to traditional Fortran, C/C ++, etc.Programming LanguageCompared with M that implements the same functionCodeIt is more concise and efficient, but the operation time is longer.

M file reviewer:

MATLAB provides an optimization and debugging tool called profile to help usersProgramTo find out which codes are the most time-consuming.

Profile keywords can be: On, off, resume, clear, viewer, etc.

Example:

> Profile on
> Plot (MAGIC (35 ))

> Profile Viewer

> Profsave (profile ('info'), 'profile _ results ')

Profile on-History

Plot (MAGIC (4 ));

P = profile ('info ');

For n = 1: size (P. functionhistory, 2)

If P. functionhistory (1, N) = 0

STR = 'entering function :';

Else

STR = 'exiting function :';

End

Disp ([str p. functiontable (P. functionhistory (2, n). functionname)]);

End