Check if variable exists in workspace to plot... Learn more about gui, error, check variable, exist, workspace, errordlg, if statement MATLAB
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...
testresults = magic(5) %create variable exist testresults; %returns "1", variable exists if (exist testresults var) %why can't I check if this exists? %File: temp.m Line: 6 Column: 11 %Invalid expression. Check for missing multiplication operator, missing or unbalanced...
Check if a function input exists in workspace. Learn more about function, inputs, exist, inputname, workspace
>> 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 ...
If name matches both a variable and a P-code file, exists returns 1, identifying it as a variable. If name matches both a folder and a MATLAB function, exist returns 7, identifying it as a folder. example exist name searchType returns the type of name, restricting results to the ...
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 ...
if ~exist('example_width', 'var') || isempty(example_width) example_width = round(sqrt(size(X, 2))); end % Gray Image colormap(gray); % Compute rows, cols [m n] = size(X); example_height = (n / example_width); % Compute number of items to display ...
% if no bounds exist. Set LB(i) = -Inf if X(i) is unbounded below; % set UB(i) = Inf if X(i) is unbounded above. % % X = FMINCON(FUN,X0,A,B,Aeq,Beq,LB,UB,NONLCON) subjects the minimization % to the constraints defined in NONLCON. The function NONLCON accepts X ...
https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval. It's generally a bad idea, but I don't see a good alternative without knowing the context that you plan to use this in.