Update data in uitable in second tab from button callback in first tab

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Old Newbie
Old Newbie 2025-7-15
评论： Old Newbie 2025-7-16
Hi, I am new to Matlab and still getting the hang of building an app programmatically.
I would like to update the data in a uitable based on the information supplied in a "setup" tab. In this simple example, the user can either select to calculate weights based on the number of iterations or can enter the weights manually.
I have tried to methods:
  • Create the uitable with a tag, use findobj to get the uitable and then set the data, but that returned an empty graphics place holder.
  • Create the tab with the uitable first and then send the uitable as a parameter to the button callback. This is the code shown below.
Any help will be much appreciated!
function [weights, NIter, calcWeights] = simpleApp()
function editFieldChanged(src)
NIter=src.Value;
end
function checkBoxChanged(event)
calcWeights=event.Value;
end
function parButtonPushed(src,event,tab)
if calcWeights
[weights] = repelem(1/NIter,NIter)';
k=findobj('Tag', 'weights'); % Returns empty GraphicsPlacerHolder and then error
tab.Data=weights; % No error but data is not updated in the second tab.
end
end
%% Main GUI function
% Set default values
calcWeights=false;
NIter=10;
fig = uifigure;
fig.Position(4)=250;
movegui(fig,'center');
tabgp = uitabgroup(fig);
tab1 = uitab(tabgp,"Title","Set Up");
tab2= uitab(tabgp,"Title", "Weights");
% Create second tab containing uitable
g2 = uigridlayout(tab2, [1,1]);
g2.RowHeight = {30};
g2.ColumnWidth = {'fit'};
test=zeros(NIter,1);
t1w=array2table(test,"RowNames",string(linspace(1,NIter,NIter)), "VariableNames",{'Weight'});
t11w=uitable(g2,"Data",t1w,'Tag','weights');
t11w.ColumnEditable = repelem(~calcWeights,1);
t11w.Layout.Row=2;
t11w.Layout.Column=1;
% Create first tab containing set up parameters
g = uigridlayout(tab1,[3,2]);
g.RowHeight = {22,22,22};
g.ColumnWidth = {'fit',50};
cbx=uicheckbox(g, "Text","Calculate weights?","Position",[10,10,500,22]);
cbx.Layout.Row=1;
cbx.Layout.Column=1;
cbx.ValueChangedFcn = @(src,event) checkBoxChanged(event);
lbltab1=uilabel(g,"Text","Number of iterations");
lbltab1.Layout.Row=2;
lbltab1.Layout.Column=1;
eftab1=uieditfield(g,'numeric');
eftab1.Layout.Row=2;
eftab1.Layout.Column=2;
eftab1.Value=NIter;
eftab1.ValueChangedFcn = @(src,event) editFieldChanged(src);
btab11=uibutton(g,'Text','Continue',"ButtonPushedFcn", @(src,event) parButtonPushed(t11w));
btab11.Layout.Row=3;
btab11.Layout.Column = 1;
end

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采纳的回答

Harald
Harald 2025-7-15
编辑：Harald 2025-7-15
Hi,
to be honest, I am not sure why your code line returns the empty graphics placeholder. A fix however would be:
k=findobj(fig, 'Tag', 'weights')
Also if that's what you intend, be sure to use that object in the next line:
k.Data=weights;
Personally, I find it a lot easier to use App Designer. If you want to get started with it, take this free Onramp:
https://matlabacademy.mathworks.com/details/app-building-onramp/orab
Best wishes,
Harald
  1 个评论
Old Newbie
Old Newbie 2025-7-16
Thank you - your solution worked and is neater than my "fix".
The layout of the actual app that I am building depends on user inputs so I am finding it easier to do it programmatically. However, I will go through the Onramp and see if I can do the same with the App Designer.

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更多回答（1 个）

Old Newbie
Old Newbie 2025-7-15
I have figured it out - silly mistake on my side. Leaving the answer here in case it helps someone else battling with the same problem.
When I send the parameters to the callback, I only sent one parameter, while the callback function expected 3, so the callback function took the first parameter as the table to change. A simple change to set src.Data=weights rather than tab.Data=weights worked.
function [weights, NIter, calcWeights] = simpleApp()
function editFieldChanged(src)
NIter=src.Value;
end
function checkBoxChanged(event)
calcWeights=event.Value;
end
function parButtonPushed(src)
if calcWeights
[weights] = repelem(1/NIter,NIter)';
k=findobj('Tag', 'weights');
src.Data=weights;
end
end
%% Main GUI function
% Set default values
calcWeights=false;
NIter=10;
fig = uifigure;
fig.Position(4)=250;
movegui(fig,'center');
tabgp = uitabgroup(fig);
tab1 = uitab(tabgp,"Title","Set Up");
tab2= uitab(tabgp,"Title", "Weights");
g2 = uigridlayout(tab2, [1,1]);
g2.RowHeight = {30};
g2.ColumnWidth = {'fit'};
test=zeros(NIter,1);
t1w=array2table(test,"RowNames",string(linspace(1,NIter,NIter)), "VariableNames",{'Benchmark Weight'});
t11w=uitable(g2,"Data",t1w,'Tag','weights');
t11w.ColumnEditable = repelem(~calcWeights,1);
t11w.Layout.Row=2;
t11w.Layout.Column=1;
g = uigridlayout(tab1,[3,2]);
g.RowHeight = {22,22,22};
g.ColumnWidth = {'fit',50};
cbx=uicheckbox(g, "Text","Calculate weights?","Position",[10,10,500,22]);
cbx.Layout.Row=1;
cbx.Layout.Column=1;
cbx.ValueChangedFcn = @(src,event) checkBoxChanged(event);
lbltab1=uilabel(g,"Text","Number of iterations");
lbltab1.Layout.Row=2;
lbltab1.Layout.Column=1;
eftab1=uieditfield(g,'numeric');
eftab1.Layout.Row=2;
eftab1.Layout.Column=2;
eftab1.Value=NIter;
eftab1.ValueChangedFcn = @(src,event) editFieldChanged(src);
btab11=uibutton(g,'Text','Continue',"ButtonPushedFcn", @(src,event) parButtonPushed(t11w));
btab11.Layout.Row=3;
btab11.Layout.Column = 1;
end

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