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 是用符号计算吗？ 可以用函数 sym( )定义符号变量。>> sym('x') %定义符号变量xans =x用命令 syms 定义符号变量。>>syms a b变量y没有定义估计把代码发上来看看
Check if variable exists in workspace to plot... Learn more about gui, error, check variable, exist, workspace, errordlg, if statement MATLAB
If you do not initialize the global data, the app looks for the variable in the MATLAB global workspace. If the variable does not exist, the app generates an error. If you use global data in MEX functions, you must also specify whether to synchronize this data between MATLAB ...
Variable name, specified as a character vector or string scalar. Ifvardoes not exist in the specified workspace, theassigninfunction creates it. Data Types:char|string Value of variable, specified as a scalar or array value.valcan have any data type, and can include MATLAB expressions. ...
0—namedoes not exist or cannot be found for other reasons. For example, ifnameexists in a restricted folder to which MATLAB does not have access,existreturns 0. 1—nameis a variable in the workspace. 2—nameis a file with extension.m,.mlx, or.mlapp, ornameis the name of a file ...
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 when A is the full p...
>> help existEXIST Check if variables or functions are defined.EXIST('A') returns:0 if A does not exist1 if A is a variable in the workspace2 if A is an M-file on MATLAB's search path.It also returns 2 whenA is the full pathname to a file or when A is the name ...
提示是说你的model里面不连续,应该使用VariableStepDiscrete仿真模式,而不是ode45模式。有两种更改方法:1、在该model的工具栏上选择simulation,再选择并进入configuration parameters界面,从solver里面设置,type设置为variable-step,solver设置为discrete;2、或者在Diagnostics子菜单里将'Automatic solver ...
0—namedoes not exist or cannot be found for other reasons. For example, ifnameexists in a restricted folder to which MATLAB does not have access,existreturns 0. 1—nameis a variable in the workspace. 2—nameis a file with extension.m,.mlx, or.mlapp, ornameis the name of a file ...
Variable name, specified as a character vector or string scalar. Ifvardoes not exist in the specified workspace, theassigninfunction creates it. Data Types:char|string val—Value scalar|array Value of variable, specified as a scalar or array value.valcan have any data type, and can include M...