新手求教，打开matlab后出现这些警告该怎么解决

新手求教，打开matlab后出现这些警告该怎么解决

Warning: D:\MATLAB2010b\toolbox\local\pathdef.m not found.
Toolbox Path Cache is not being used. Type 'help toolbox_path_cache' for more
info
Undefined function or variable 'ispc'.
Warning: MATLAB did not appear to successfully set the search path. To recover
for this session of MATLAB, type "restoredefaultpath;matlabrc". To find out how
to avoid this warning the next time you start MATLAB, type "docsearch problem
path" after recovering for this session.
Warning: Duplicate directory name: D:\MATLAB2010b\toolbox\local.
Warning: Initializing Handle Graphics failed in matlabrc.
This indicates a potentially serious problem in your MATLAB setup,
which should be resolved as soon as possible. Error detected was:
MATLAB:UndefinedFunction
Undefined function or method 'colordef' for input arguments of type 'double'.
> In matlabrc at 100
Warning: Initializing Java preferences failed in matlabrc.
This indicates a potentially serious problem in your MATLAB setup,
which should be resolved as soon as possible. Error detected was:
MATLAB:UndefinedFunction
Undefined function or method 'usejava' for input arguments of type 'char'.
> In matlabrc at 123
Warning: Failed to add default profiler filters.
> In matlabrc at 179

numh不是结构体，你应该没写完全，看看教程里面的定义吧，这样改一下：

% by lyqmth clc; clear all; close all; numg=[1 1]; deng=[1 2]; numh=[1]; denh=[1 0]; [num,den] = feedback(numg,deng,numh,-1); printsys(num,den)

就可以了。