MATLAB: How to allow a user of the GUI to load data from a specific location in MATLAB

fileloadlocationMATLABspecifieduser

I would like to perform a load data into the MATLAB workspace from a *.mat file. I would like to do this from a GUI button click.

Best Answer

This can be done by allowing the user to specify the file location by using the UIGETFILE command.

The following example lets user locate and then load workspace from the MAT file.

[file,path] = uigetfile('*.mat','Load workspace from')
load([path file])

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MATLAB: Load Text in Edit field AppDesigner

You have to update the edit field value from the callback of the load button.

%% function for the load button.
function LOADButtonPushed(app, event)
            [file,~] = uigetfile(['*.mat'],'Load File','MultiSelect', 'off');
            if isequal(file,0)
                disp('Nothing Selected')
            else
              
               try
                   app.Data = load(file);
                   Timestep= app.Data.Profile(1,:);
                   Power = app.Data.Profile(2,:);
                   plot(app.UIAxes,Timestep,Power)
                   app.PROFILENAMEEditField.Value = file;% Set the file name here
              catch 
                    errordlg(['There was a problem loading the .mat',' file'],'Load Error!');
                    return;
               disp(['User selected ',file]);
               end
            end
%% function for the EditField

MATLAB: How to create a big mat.file including many variables generated in a GUI

Of course you can save those variable directly from the GUI workspace. And yes it is inefficient to transfer them to the base workspace, if they are not required there. Your code

save('path\myfile.mat');

will work just as well inside the GUI workspace as it does in the base workspace.

With a few minor differences basically every workspace (base or function) lets you do the same things: create variables, save them, call other functions, etc, etc. The difference are noted in the documentation (e.g. nargin), but functions like save can be called from any workspace.

You should read about the different workspaces:

http://www.mathworks.com/help/matlab/matlab_prog/base-and-function-workspaces.html

and how to share data between them

http://www.mathworks.com/help/matlab/matlab_prog/share-data-between-workspaces.html

Note that the most efficient way to share data is to pass them as variables, and the least efficient way is to use assignin or evalin (although beginners seem to love using these two functions they should be avoided).

Best Answer

Related Solutions

MATLAB: Load Text in Edit field AppDesigner

MATLAB: How to create a big mat.file including many variables generated in a GUI

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