A table variable name subscript must be a character vector

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sydney salvador
sydney salvador 2020-4-30
评论： Ameer Hamza 2020-5-1
What does my error mean? i am trying to upload a ".xls" file using "add button"and transfer the data into a table and "add button" will calculate for stress and strain and plot in UI.axes
% Button pushed function: AddButton
function AddButtonPushed(app, event)
strain = app.StrainEditField.Value;
stress = app.StressEditField.Value;
nr = {strain, stress};
app.UITable.Data = [app.t;nr];
end
% Button pushed function: PlotButton
function PlotButtonPushed(app, event)
app.t = readtable('BlankSheet.xlsx','Sheet',1);
strain = table2array(app.t(:,"")); %A table variable name subscript must be a character vector, string array, or cell array of character vectors.
stress = table2array(app.t(:,""));
plot(app.UIAxes,strain,stress);
end
end

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Ameer Hamza
Ameer Hamza 2020-4-30
You need to write the name of column
strain = table2array(app.t(:,"strain_column_name")); %A table variable name subscript must be a character vector, string array, or cell array of character vectors.
stress = table2array(app.t(:,"stress_column_name"));
Also, you can avoid table2array to array by using brace indexing
strain = app.t{:,"strain_column_name"}; %A table variable name subscript must be a character vector, string array, or cell array of character vectors.
stress = app.t{:,"stress_column_name"};
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