MATLAB R2018a hangs on busy when performing certain tasks

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Francesco Brozzu 2018-5-3

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https://ww2.mathworks.cn/matlabcentral/answers/398906-matlab-r2018a-hangs-on-busy-when-performing-certain-tasks

评论： Francesco Brozzu 2018-5-3

I'm trying to run a script that computes a function at a specific time instant which is given by the value inside a time vector in this way:

w= @(t) heaviside(t); Tmax=1e-1; dt=1e-3; time = 0:dt:Tmax; w(time(k))

However once the script gets to the w(time(k)) part MATLAB gets stuck on busy, the interface still responds but I am unable to perform any command.

The same issue happens when trying to restore a MATLAB workspace.

I already tried to reinstall MATLAB from scratch but I still get the same issue.

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Walter Roberson 2018-5-3

Is this Windows 10 with the 2018 spring update?

Francesco Brozzu 2018-5-3

在 MATLAB Online 中打开

k is an integer, I'm doing this in a for loop. I left MATLAB on the busy state for 10 minutes and it got unstuck with this error when computing heaviside(0):

Function call 'heaviside(0)' yields a symbolic object. Use 'sympref("HeavisideAtOrigin", v)' with some
numeric value v to change 'heaviside(0)' to v.

Also yes I just updated Windows 10 to the spring update.

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Answer 1

Walter Roberson 2018-5-3

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https://ww2.mathworks.cn/matlabcentral/answers/398906-matlab-r2018a-hangs-on-busy-when-performing-certain-tasks#answer_318558

https://www.mathworks.com/support/bugreports/1755918

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Francesco Brozzu 2018-5-3

That was the issue I was experiencing, installing Update 1 fixed symbolic math toolbox. The problem with importing the workspace was due to the fact that the workspace had symbolic variables.

Thank you!

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