readme.txt

离散控制系统设计的MATLAB 代码

     Notes on using MATLAB .M files accompanying the text 

                Discrete-Time Control Problems 
         using MATLAB and the Control Systems Toolbox

        by J. H. Chow, D. K. Frederick, and N. W. Chbat


The MATLAB .M files accompanying the text are organized in folders 
from 'ch2' to 'ch10', with the RPI functions in the folder 'tools' 
and the models for the comprehensive problems in the folder 'models'. 


Users may find the following suggestions helpful.

1. Including 'tools' and 'models' in MATLAB path 

     Use the 'addpath' command to modify the path to make the RPI 
functions and the model files available from any directory, the user 
can add a path in MATLAB pointing to these folders. The file 
'set_my_path.m' can be adapted and executed at the start of each 
MATLAB session to set up the paths. The 'set_my_path.m' file could 
also be run by the startup file '/matlab/startup.m'. Comments are 
provided in the 'set_my_path.m' file on how to adapt the file to 
the user's need. Alternatively, the user can always copy the 
required files to the working directory. 

2. Making axes equal and the 'ucircle' function 

     Making the x- and y- axes equal is useful in certain plots 
such as root locus and pzmap. In MATLAB, to enforce axes to be 
equal, the 'axis equal' command needs to be issued before any LTI 
response plot command (such as 'rlocus' and 'pzmap') is used. The 
'ucircle' function, which plots a unit circle, is coded to execute 
the 'axis equal' command. Thus the user does not have to enter this 
command again. Hence, the 'axis equal' command in several MATLAB 
scripts in the text, such as Script 2.1 on page 11, is no longer 
needed. 


To report problems with any of the m files, please email Joe Chow at 
[e-mail]. 


November 25, 2002