Plotting in app designer

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Ville Saunajoki
Ville Saunajoki 2018-2-7
评论： Ville Saunajoki 2018-2-9
I am creating an app to quickly plot csv data. UiAxis for plot needs to be updated once the data is imported but I cannot get it working. The UIAxis element is done in app designer. Plotting is done with app's internal function:
methods (Access = private)
function results = plotWidths(app)
histogram(app.UIAxes, app.Data.Width)
end
The plot component (named UIAxes) is within a panel if that makes any difference. The property Data is a table that has a column Width.
Thank you already in advanced.
  1 个评论
Birdman
Birdman 2018-2-7
So basically, you want to upload some numerical data from your excel file and plot it on App Designer?

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回答（1 个）

Kai Domhardt
Kai Domhardt 2018-2-7
编辑：Kai Domhardt 2018-2-7
From what I can tell, your version should be working. I tested the following:
The structure of the components:
app.UIFigure
app.Panel
app.UIAxes
test.csv:
Width, Height
1, 7
2, 6
3, 5
4, 4
5, 3
6, 2
7, 1
The function from where the .csv is read and the plotWidths function is called. I chose the startupFcn for ease of testing, but it could be any other method or callback.
function startupFcn(app)
filename = 'test.csv';
csv_table = readtable(filename);
app.Data = csv_table;
plotWidths(app);
end
The same plotWidths method that you used:
function results = plotWidths(app)
histogram(app.UIAxes, app.Data.Width)
end
When I run this with Matlab R2017b it works without any errors. Does your use deviate in any meaningful way from this?
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Kai Domhardt
Kai Domhardt 2018-2-7
The default value for UIAxes.XLimMode and UIAxes.YLimMode is 'auto', 'manual' would need to be set before plotting.
Ville Saunajoki
Ville Saunajoki 2018-2-9
When the app designer adds a plot without data it lists the following
% Create UIAxes
app.UIAxes = uiaxes(app.Panel);
app.UIAxes.DataAspectRatio = [1 1 1];
app.UIAxes.PlotBoxAspectRatio = [1 1 1];
app.UIAxes.XLim = [0 1];
app.UIAxes.YLim = [0 1];
app.UIAxes.ZLim = [0 1];
app.UIAxes.CLim = [0 1];
app.UIAxes.GridColor = [0.15 0.15 0.15];
app.UIAxes.MinorGridColor = [0.1 0.1 0.1];
app.UIAxes.XColor = [0.15 0.15 0.15];
app.UIAxes.XTick = [0 0.2 0.4 0.6 0.8 1];
app.UIAxes.YColor = [0.15 0.15 0.15];
app.UIAxes.YTick = [0 0.5 1];
app.UIAxes.ZColor = [0.15 0.15 0.15];
app.UIAxes.ZTick = [0 0.5 1];
app.UIAxes.CameraPosition = [0.5 0.5 9.16025403784439];
app.UIAxes.CameraTarget = [0.5 0.5 0.5];
app.UIAxes.CameraUpVector = [0 1 0];
app.UIAxes.Position = [0 235 268 140];
In debugging most of those mode properties (XLimMode, PlotBoxAspectRatioMode, ZTickMode...) seem to be 'manual'. I guess that this specific declaration of properties sets their modes to 'manual'.
So I'll do a initialization function to set those modes of all graphs to 'auto' and then run it in start-up function. Hopefully that will auto scale all the later data.
As interesting work-around I tested to plot some random data points in start-up.
function startupFcn(app, args)
scatter(app.UIAxes, [1,2], [1,2]);
end
That did not scale automatically. So I need to separately declare those modes to 'auto'.
I hope this is a lesson for others or fix for the next update :)

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