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around that control. Performing a mouse click directly on that control will notdisplay the explanation again.Pushing the apply-pushbutton causes the GUI to close and all the changesfor the setup are saved into the structure array that the user defined as outputargument when he called geldasetup / gendasetup. The current state ofthe structure array is printed in the command window when the user hits theprint-pushbutton.Finally, we turn our focus on the parameters of the GUIs.4.1 GUI for Linear ProblemsFigure 5: GUI for GELDAIn the top left-hand corner there is a pop-up menu where the method which willbe applied to solve the problem can be chosen (BDF- or Runge-Kutta–method).In the following all parameters which can be set in the GUI are explained.We assume that the structure array holding all information is named setup.TSTOP If the user uses the BDF–solver (METHOD = 1), the code may integratepast TOUT (= t f ) and interpolate to obtain the result at TOUT, tohandle solutions at many specific values TOUT efficiently. Sometimes it is18