Error using hilbert for envelope detection

Hello,

I am now finalising my thesis and i have a problem with using Hilbert for envelope detection.

This is the way i am using it:

out(1,:)=filter(b1, a1, wavedata1);

out(2,:)=filter(b2, a2, wavedata1);

out(3,:)=filter(b3, a3, wavedata1);

out(4,:)=filter(b4, a4, wavedata1);

out(5,:)=filter(b5, a5, wavedata1);

out(6,:)=filter(b6, a6, wavedata1);

out(7,:)=filter(b7, a7, wavedata1);

out(8,:)=filter(b8, a8, wavedata1);

out(9,:)=filter(b9, a9, wavedata1);

out(10,:)=filter(b10, a10, wavedata1);

out(11,:)=filter(b11, a11, wavedata1);

out(12,:)=filter(b12, a12, wavedata1);

out(13,:)=filter(b13, a13, wavedata1);

for i=1:channel
    envelope(i,:) = abs(hilbert(out(i, :)));
end

where a and b are the butter coefficients for each sub-band.

The error i get is:

??? Error using ==> hilbert Too many input arguments.

Error in ==> licenta_simulare1 at 261 envelope(i,:) = abs(hilbert(out(i, :)));

Unfortunately I have also tried the example in the help section and it is still not working, receiving the same error.

In the same time on another matlab 2010, but for linux it works perfectly. Can you please help me with advice and tell me how i can solve this problem?

Thanks you, Alexandra

[bym]

Is this really your for loop?

for i=1:channel envelope(i,:) = abs(hilbert(out(i, :))); end

Please format your code using {} button

[Kaustubha Govind]

What do you see when you execute "which hilbert" at your MATLAB prompt?

Answer 1

[Daniel Shub]

have you redefined hilbert someplace in your code

which hilbert

should give something like

.../signal/signal/hilbert.m