Check if variable exists in workspace to plot... Learn more about gui, error, check variable, exist, workspace, errordlg, if statement MATLAB
checking if struct exists, GUI related. Learn more about gui, guide, struct, structure, appdata, cell array, exist, cellfun
A variable named testresults exists in the workspace. Check Existence of Folder Copy Code Copy Command Create the folder myfolder, and then check its existence as a folder. Get mkdir myfolder; exist myfolder dir ans = 7 If you specify the type as file, MATLAB® searches for both fil...
Open in MATLAB Online ThemeCopy clear all; %disp(testresults); %can't work because variable testresults does not %exist. testresults = magic(5) %create variable exist testresults; %returns "1", variable exists if (exist testresults var) %why can't I check if this ex...
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 ...
One common operation is to check if a struct field exists. We can do this using the "isfield" function. The syntax for using this function is as follows: isfield(structVariable, 'fieldName') The function will return a logical value, true if the field exists, and false otherwise. For ...
A variable named np is assigned to hold the number in the first row and column of mat1, which is the number of finite element nodes. Four 15×1 matrices ip,x,y and g each holds the information stored in row 2 to 16, columns 1,2,3 and 4 of mat1 respectively. Matrix ip contains...
Enter the username and password in the Authenticate dialog box and then click OK. Note The user you set up when you configured your Mac is an administrator . If you don’t know the username and password for an administrator, check with the who administers your Macintosh. 2-9 2 Installing...
If a variable already exists in a MAT-file, then save overwrites it with the value in the workspace. For ASCII files, "-append" adds data to the end of the file. To append to a Version 6 MAT-file, you must also specify version as "-v6"....
例一:基于线性模型MPC控制 对于线性模型如下: x˙=Ax+Buy=Cx+Du 定义模型: A = [ -5 -0.3427; 47.68 2.785]; B = [ 0 1 0.3 0]; C = [0 1; 1 0]; D = zeros(2,2); CSTR = ss(A,B,C,D); 设置输入、输出、状态变量名,以及相应的单位: ...