Xlim error in App designer
显示 更早的评论
% Value changing function: STARTKnob_2
function STARTKnob_2ValueChanging(app, event)
arguments
app
event.Value(1,1) {mustBeNumeric}=0
end
app.StartYear = event.Value;
if app.StartYear>app.StopYear-1 %checks the increasing-xrule
app.StopYear=min([app.StartYear+1,app.STOPKnob.Limits(2)]);
app.STOPKnob.Value=app.StopYear; %rotate the stop knob
app.StartYear=app.StopYear-1;
app.STARTKnob_2.Value=app.StartYear;
end
app.plotData();
end
% Value changing function: STOPKnob
function STOPKnobValueChanging(app, event)
arguments
app
event.Value(1,1) {mustBeNumeric}=0
end
app.StopYear = event.Value;
if app.StopYear<app.StartYear+1
app.StartYear=max([app.StopYear-1 app.STARTKnob_2.Limits(1)]);
app.STARTKnob_2.Value=app.StartYear;
app.StopYear=app.StartYear+1;
app.STOPKnob.Value=app.StopYear;
end
app.plotData();
4 个评论
Mukesh
2025-3-22
@Mukesh try with following change in these lines
app.StarYear.Value = event.Value
app.StopYear.Value = event.Value
xlim(app.UIAxes, [app.StartYear.Value app.StopYear.Value])
@Mukesh if you dont want the default values of xlim to be used,
then inside the function plotData you need to put the xlim line with manual first which will override the default values.
function plotData(app)
xlim(app.UIAxes, 'manual') % put this line first
%app.StarYear.Value = event.Value
%app.StopYear.Value = event.Value
xlim(app.UIAxes, [app.StartYear.Value app.StopYear.Value])
采纳的回答
Image Analyst
2025-3-22
You need to debug your program. See
After that, when you see an error that says the limits of the min and max values you're passing into xlim must be increasing values, you'll know how to check their values. What you need to do is set a breakpoint at xlim and hover over app to see what the values of StartYear and StopYear are. Or else just put them in the code right before xlim
app.StartYear
app.StopYear % No semicolons!
xlim(app.UIAxes, [app.StartYear, app.StopYear])
What are their values?
7 个评论
Mukesh
2025-3-23
Image Analyst
2025-3-23
You said "Even after defining the upper and lower limits for xlim..." and I asked "what are their values?" You did not answer me. Why not? Did you try what I said?
Mukesh
2025-3-23
Image Analyst
2025-3-23
How about if you just don't call xlim and let it automatically decide what the limits should be?
Mukesh
2025-3-23
Image Analyst
2025-3-23
编辑：Image Analyst
2025-3-23
So I assume that means you want the same start and stop values over multiple sets of data, instead of adjusting it on a vector-by-vector basis. But you're evidently setting them both to the same value.
Does your app have a startupFcn? If not, add one and set the app.Start and Stop to some default values. Or else use isempty() when you're trying to turn the knobs or plot data to make sure the start and stop values are not null.
Can you attach your GlobalTemp.mlapp so that I can fix it? Also a set of data if one is needed to run the program.
Mukesh
2025-3-25
更多回答（1 个）
Walter Roberson
2025-3-22
You do not provide initial values for app.StartYear or app.StopYear, so they are initialized to [] (the empty vector)
Then when you test
if app.StartYear>app.StopYear-1
then app.StartYear = event.Value might have given a value to app.StartYear, but app.StopYear is still [] and testing (Value>[]) is false.
3 个评论
Walter Roberson
2025-3-23
It is not an error to calculate with [] .
(It is typically an error to try to store [] into indexed locations. Not always though.)
With it not being an error to calculate with [], the error is not encounted until the call to
xlim(app.UIAxes, [app.StartYear app.StopYear])
with app.StopYear being [] the above call would collapse to
xlim(app.UIAxes, [app.StartYear []])
which would be
xlim(app.UIAxes, app.StartYear)
which would error because the input vector is only length 1.
Mukesh
2025-3-23
类别
在 帮助中心 和 File Exchange 中查找有关 Startup and Shutdown 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
