How to use data from base workspace in app designer application

Question

Daan Decleer 2017-5-1

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https://ww2.mathworks.cn/matlabcentral/answers/338217-how-to-use-data-from-base-workspace-in-app-designer-application

评论： Mark Sahlin 2022-4-18

Hello

In my app designer program I have several Numeric Edit Fields, I would like to set them to the already declared variables before in the base workspace when my application opens.

Is there a way I can load the existing Variable and put them in the already existing EditField?

Thanks already, I look out to your answers.

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Answer 1

xi 2017-5-1

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https://ww2.mathworks.cn/matlabcentral/answers/338217-how-to-use-data-from-base-workspace-in-app-designer-application#answer_265241

initialize your EditFields using evalin(), such as: app.EditField1.Value=evalin('base','myvar1'); app.EditField2.Value=evalin('base','myvar2'); ...

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Erik Vabo Vatsvaag 2020-11-4

在 MATLAB Online 中打开

Hello,

How to I change the value of the variable in the workspaced using the value in the edit field.

I have the following code and whenever I change the value of the edit field I get the following error:

Error using app1/ValueEditFieldValueChanged (line 53)

Error: Incorrect use of '=' operator. To assign a value to a variable, use '='. To compare values for equality, use

'=='.

Error using matlab.ui.control.internal.controller.ComponentController/executeUserCallback (line 378)

Error while evaluating NumericEditField PrivateValueChangedFcn.

Any help?

Thank you

function startupFcn(app)
            app.vars = evalin('base', 'whos');
            cell_array = cell(size(app.vars));
            for i=1:length(app.vars)
                cell_array{i} = app.vars(i).name;
                
            end
            app.DropDown_2.Items = cell_array;
            app.variable = app.vars(1).name;
            app.ValueEditField.Value = evalin('base', app.vars(1).name);
        end
        % Value changed function: DropDown_2
        function DropDown_2ValueChanged(app, event)
            app.variable = app.DropDown_2.Value;
            app.vars = evalin('base', 'whos');
            cell_array = cell(size(app.vars));
            for i=1:length(app.vars)
                cell_array{i} = app.vars(i).name;
                %app.ValueEditField.Value = app.vars(i).value;
            end
            app.DropDown_2.Items = cell_array;
            app.ValueEditField.Value = evalin('base', app.variable);
        end
        % Value changed function: ValueEditField
        function ValueEditFieldValueChanged(app, event)
            app.varvalue = app.ValueEditField.Value;
            app.vars = evalin('base', [app.variable,' = ',num2str(app.varvalue),';']);
        end