Check if variable exists in workspace to plot... Learn more about gui, error, check variable, exist, workspace, errordlg, if statement MATLAB
%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 exists? %File: temp.m Line: 6 Column: 11...
Check if a function input exists in workspace. Learn more about function, inputs, exist, inputname, workspace
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 ...
4: The variable or file exists as a function in the current workspace, even if it is also defined as a variable. 5: The variable or file exists as a MEX-file in the current workspace. 6: The variable or file exists as a P-file in the current workspace. 7: The variable or file ...
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 ...
The output variable PATHNAME is a string containing the path of the file selected in the dialog box. If the user presses Cancel, it is set to 0. The output variable FILTERINDEX returns the index of the filter selected in the dialog box. The indexing starts at 1. If the user ...
Agoodexamplematrix,usedthroughoutthisbook,appearsintheRenaissanceengravingMelancholiaIbytheGermanartistandamateurmathematicianAlbrechtDürer.Thisimageisfilledwithmathematicalsymbolism,andifyoulookcarefully,youwillseeamatrixintheupperrightcorner.ThismatrixisknownasamagicsquareandwasbelievedbymanyinDürer'stimetohavegenuinely...
52、rpose%Todemonstrateopeninganoutputfileproperly.%Thisprogramchecksfortheexistenceofanoutput%fileIfitexists,theprogramcheckstoseeif%theoldfileshouldbedeleted,oriftlienewdata%shouldbeappendedtotheoldfile%Recordofrevisions:%DateProgrammerDescriptionofchange一%11/29/98S.J.ChapmanOnginalcode%Definevariable 53...
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"....