Error using a function in App Designer, not returning the correct value.

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George Fryda
George Fryda on 1 Nov 2019
Commented: Jyotsna Talluri on 7 Nov 2019
I am attempting to create an fsolve function inside of an app in the App Designer tool.
methods (Access = private)
function Deceleration = SolveForDecel(~,UTF,HB,HT,L,LB,LT,WC,WT,PHI,CHI,PSI,PSIT)
fun = @(x) x*(1+PHI)*(1+WC/(WC+WT))/((1-PSI+x*CHI)-(WC/(WC-WT))*((1-PSIT)*LB/L+x*((HT/LT-HB/LT)*LB/L-HB/L)))-UTF;
x = fzero(fun,.1);
Deceleration = x;
end
end
methods (Access = private)
% Callback function: SolveforDecelerationButton, UIFigure
function UIFigureKeyPress(app, event)
valuefordecel = SolveForDecel(app,app.TireRoadfrictioncoefficientEditField.Value, ...
app.GroundhitchballEditField.Value, ...
app.GroundcgtrailerEditField.Value, ...
app.WheelbaseofcarEditField.Value, ...
app.RearaxlecarhitchballEditField.Value, ...
app.TraileraxlehitchballEditField.Value, ...
app.WeightofcarEditField.Value, ...
app.WeightoftrailerEditField.Value, ...
app.RearbrakeFtotalbrakeFEditField.Value, ...
app.cgheightcarwheelbaseEditField.Value, ...
app.rearaxlenotrailerweightEditField.Value, ...
app.rearaxletrailerweightEditField.Value);
app.DecelerationofCombinationEditField.Value = valuefordecel;
I believe the event is being triggered, and then it runs into an issue in the Fsolve (these are the outputs):
Exiting fzero: aborting search for an interval containing a sign change
because NaN or Inf function value encountered during search.
(Function value at -1.15052e+308 is NaN.)
Check function or try again with a different starting value.
Error using matlab.ui.control.internal.model.AbstractNumericComponent/set.Value (line 185)
'Value' must be a double scalar within the range of 'Limits'.
Error in Trailer_Dynamic_Simulation_Model/UIFigureKeyPress (line 79)
app.DecelerationofCombinationEditField.Value = valuefordecel;
Error using matlab.ui.control.internal.controller.ComponentController/executeUserCallback (line 335)
Error while evaluating Button PrivateButtonPushedFcn.
I am at a loss to determine exactly what the solution is. When I manually run through the function in the command window with realistic values it solves to .3014, which makes sense.
The error it is reading out in App Designer is:
  3 Comments

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Answers (1)

Jyotsna Talluri
Jyotsna Talluri on 6 Nov 2019
Hi,
The possible cause of error may be because of using 'Edit Field(Text)' instead of 'Edit Field (Numeric)'.Make sure you are using the 'Edit Field(Numeric)'.It worked for me when I reproduced it with your given inputs and equation as shown in the attched figure
  2 Comments
Jyotsna Talluri
Jyotsna Talluri on 7 Nov 2019
If you are declaring the inputs through the Numeric edit fields ,the it should work fine.Can you share the entire code in a .m file and the app layout screenshot so that I can check once?

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