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Exist()函数在mAtlAB中怎么用?求教大神~

exist在matlab中是用于检验某个参数变量是否存在或是否符合设定要求的函数,其不同的返回值代表的不同含义。 exist name 等价于 r=exist(name) ,在程序里面这样更加实用 0 不存在则返回值 1 name 可以是变量名,如果存在,返回值 2 函数名、m 文...

>> help exist EXIST Check if variables or functions are defined. EXIST('A') returns: 0 if A does not exist 1 if A is a variable in the workspace 2 if A is an M-file on MATLAB's search path.It also returns 2 when A is the full p...

exist用来判断变量或函数是否存在: exist Check if variables or functions are defined. exist('A') returns: 0 if A does not exist 1 if A is a variable in the workspace 2 if A is an M-file on MATLAB's search path. It also returns 2...

exist('im', 'var')是检测im中的变量是否存在 如果不存在返回0,存在返回1 ~exist('im', 'var')是对结果取非运算

楼上说的有问题, The variable y does not exist意思是变量y不存在 还有,不能直接对函数文件运行,函数要放在主文件里调用才可以

公式如下: >> c=zeros(2,2); >> a=[1 0;2 1]; >> b=[1 0;0 1]; >> x=lyap(a,-b,c) ??? Solution does not exist or is not unique 所以不存在相似矩阵。

>> help exist EXIST Check if variables or functions are defined. EXIST('A') returns: 0 if A does not exist 1 if A is a variable in the workspace 2 if A is an M-file on MATLAB's search path. It also returns 2 when A is the full ...

没有xlswrite函数,我这个t版本有,你自己o拷去建个xm文5件 function [success,message]=xlswrite(file,data,sheet,range) % XLSWRITE Stores numeric array or cell array in Excel workbook。 % [SUCCESS,MESSAGE]=XLSWRITE(FILE,ARRAY,SHEET,...

先等等大神……

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