'Envelope' function doesn't work anymore

Hi all,

I am experiencing a strange problem with a code that I wrote about a year ago. It seems that the key of my problem is that the 'envelope' function doesn't work anymore.

Essentially, I can't even reproduce the first example from the mathworks website https://uk.mathworks.com/help/signal/ref/envelope.html anymore. Matlab is just 'Busy' for an insanely long time and 'Ctrl + c' doesn't stop the process either.

I have just updated from 2017b to 2018b to see if this solves the problem, but it doesn't. I use Windows 7.

Grateful for any help! Thanks!

[Jan]

Ple post a minimal example, which reproduces the problem.

I guess, that you have a shadowed built-in function in your path. See FileExchnage: UniqueFuncNames

If you press Ctrl-C, where does it stop?

[Conny Boldt]

Hi, apologies, the example is

t = 0:1/2000:2-1/2000;

q = chirp(t-2,4,1/2,6,'quadratic',100,'convex').*exp(-4*(t-1).^2);

plot(t,q)

[up,lo] = envelope(q);

hold on

plot(t,up,t,lo,'linewidth',1.5)

legend('q','up','lo')

hold off

It is the first example from the mathworks website.

With ctrl+c, matlab doesn't stop at all, atm I have to force the programme to stop in order to exit the script.

[Conny Boldt]

Hi Jan, I have tested Ok = UniqueFuncNames().

After uninstalling several tookboxes, the remaining two conflicts are

-- rtwTargetInfo:

C:\Program Files\MATLAB\R2018b\toolbox\coder\coder\rtwTargetInfo.p

C:\Program Files\MATLAB\R2018b\toolbox\coder\foundation\build\tools\registry\rtwTargetInfo.p

Yet I don't even have the coder toolbox in my add-on list? I am a bit confused about what to do now.

Answer 1

[Luna]

Maybe this would help you:

restoredefaultpath
rehash toolboxcache
savepath

Please restart Matlab after this execution.