Show coordinates for a 2D point in a table cell
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Quist
el 6 de Jul. de 2024 a las 7:20
I'm working on a MATLAB app where I'm trying to dynamically record and show every mouse click on the UIAxes in a UItable.
My problem is that the table only shows "1x2 double" in the designated cell for the coordinates instead of the actual numbers.
Is this possible to fix or do I have to split them into two columns?
app.PointsTable.Data = table('Size',[0 2],'VariableNames', {'Point', 'Coordinates'}, 'VariableTypes', {'uint8', 'cell'});
function UIAxesButtonDown(app, event)
if 1
coordinates = app.UIAxes.CurrentPoint(1, 1:2);
numRows = size(app.PointsTable.Data, 1);
app.PointsTable.Data(numRows+1, :) = {numRows+1, {[coordinates(1) coordinates(2)]}};
end
end
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1728841/image.png)
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Voss
el 7 de Jul. de 2024 a las 23:20
One way to display a vector in a single cell of a uitable is to make it into a string:
app.PointsTable.Data = table( ...
'Size', [0 2], ...
'VariableNames', {'Point', 'Coordinates'}, ...
'VariableTypes', {'uint8', 'string'}); % string type now, not cell
function UIAxesButtonDown(app, event)
if 1
coordinates = app.UIAxes.CurrentPoint([1 2]);
numRows = size(app.PointsTable.Data, 1);
app.PointsTable.Data(numRows+1, :) = {numRows+1, "[" + join(compose("%f",coordinates),",") + "]"}
end
end
2 comentarios
Voss
el 11 de Jul. de 2024 a las 15:34
Editada: Voss
el 11 de Jul. de 2024 a las 15:38
You're welcome!
Regarding the question of using the uitable for storage vs mirroring it, in my opinion:
- if the user can edit the uitable (add/delete rows, modify cell contents), then use the uitable as the storage with no variable(s) mirroring its contents
- if the user cannot edit the uitable, then use the variable(s) on which the uitable's contents are based when you need to access the data; if there are no such variables, then you'd need to implement them, or just use the uitable as storage (option 1)
In case you need it, here's an example showing one way to recover the numeric data from the strings in the uitable:
% a table variable:
app.PointsTable.Data = table( ...
'Size', [0 2], ...
'VariableNames', {'Point', 'Coordinates'}, ...
'VariableTypes', {'uint8', 'string'});
% add five rows of random coordinates:
for ii = 1:5
coordinates = rand(1,2);
numRows = size(app.PointsTable.Data, 1);
app.PointsTable.Data(numRows+1, :) = {numRows+1, "[" + join(compose("%f",coordinates),",") + "]"};
end
% show the table variable:
disp(app.PointsTable.Data)
% get a numeric matrix of the coordinates:
F = @(s)str2num(s,'Evaluation','restricted');
C = arrayfun(F,app.PointsTable.Data.Coordinates,'UniformOutput',false);
M = vertcat(C{:});
% show the numeric matrix
format long g
disp(M)
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