Debug stack on error

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Alexandra 2020-8-28

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https://ww2.mathworks.cn/matlabcentral/answers/585692-debug-stack-on-error

评论： Alexandra 2020-9-3

Dear all,

since I use the newer version of Matlab, I habe a problem with the debug mode. Whenever I use dbstop if error, the debugger stops miles deep in some Matlab functions and not at the position of the error. Even if I try to step through the call stack, I only step though a lot of Matlab functionality until I end up outside of debug mode.

Why is this happening? I really loved to use dbstop if error and now it is useless to me.

Best regards

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Alexandra 2020-8-31

在 MATLAB Online 中打开

I tried some different combinations, and it seems the problem only occurs in appdesigner applications. The output of dbstack is

> In appdesigner.internal.service/AppManagementService/tryCallback (line 391)
  In matlab.apps.AppBase>@(source,event)tryCallback(appdesigner.internal.service.AppManagementService.instance(),app,callback,requiresEventData,event) (line 35)
  In matlab.ui.control.internal.controller/ComponentController/executeUserCallback (line 382)
  In matlab.ui.control.internal.controller/ComponentController/handleUserInteraction (line 332)
  In matlab.ui.control.internal.controller/PushButtonController/handleEvent (line 86)
  In appdesservices.internal.interfaces.controller/AbstractController/handleProxyViewEvent (line 280)
  In appdesservices.internal.interfaces.controller.AbstractController>@(src,event)handleProxyViewEvent(obj,src,event) (line 208)
  In appdesservices.internal.interfaces.view/AbstractProxyView/notify (line 117)
  In appdesservices.internal.peermodel/PeerNodeProxyView/handlePeerEventFromClient (line 252)
  In appdesservices.internal.peermodel.PeerNodeProxyView>@(varargin)obj.handlePeerEventFromClient(varargin{:}) (line 84)
  In hgfeval (line 62)
  In javaaddlistener>cbBridge (line 52)
  In javaaddlistener>@(o,e)cbBridge(o,e,response) (line 47)

In this case, the code causing the error is a simple assert statement, but it happens to all errors in the app

Adam Danz 2020-9-2

@Bjorn, 😃 I know exactly what you're talking about. The problem with commenting-out the try/catch in this case is that it's part of a Matlab function so alterations to that file are not an option. The OP could write her own try/catch around the problematic section of code to troubleshoot that way, though.

Alexandra 2020-9-3

Usually, I set a breakpoint on the line (as suggested), but if the error doesn't occur very often, I used to do "dbstop if error". But using a try and catch block around the section works well, too. Thank you for all the suggestions :-)

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