MATLAB: Undefined function ‘fftxx’ for input arguments of type ‘double’.

undefined function

Undefined function 'fftxx' for input arguments of type 'double'.

Error in komtar1 (line 636) [fyy,nfyy,dfrq,velof,dispf]=fftxx(RR1,dt,np);

may i know wat is it mean and how to solve it? Thanks.

Best Answer

in R2015a there is no fftxx command, just fft

try fft instead of fftx

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John

jgb2012@sky.com

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MATLAB: How to realzie iczt use Matlab

Hi Wei

try applying twice czt, for instance:

t=[0:.1:10]
f0=.2
x = sin(2*pi*f0*t)
Xcz = czt(x)
x2=-czt(Xcz)
plot(t,101*x,t,x2);grid on

1.- note that the 101 applied on the input signal here, so both signals can be compared, so it's the output that has to be attenuated by length(x) to get back to the signal level.

2.- MATLAB already warns:

Warning: Imaginary parts of complex X and/or Y arguments ignored

So, basically, you get the same signal back, if you ignore the Imaginary part. Rewording, you don't get back the initial signals.

3.- S.Shilling [1] and L.Rabiner R.Schafer [2] point out as CZT limitation that as soon as you take a large amount of samples, (i guess if not using MATLAB vpa, or other tools to handle arbitrary long numbers, loss of precision or) overflow may happen.

If you find this answer of any help solving this question, please click on the thumbs-up vote link, thanks in advance

John

jgb2012@sky.com

[1] https://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=0ahUKEwjkkOTeiJzLAhVEEJoKHbvTBxAQFggoMAE&url=https%3A%2F%2Fkrex.k-state.edu%2Fdspace%2Fbitstream%2Fhandle%2F2097%2F7844%2FLD2668R41972S43.pdf&usg=AFQjCNELO9KmErzLpFv0dWKcFlIqSpuUdQ

[2] http://www.ingelec.uns.edu.ar/pds2803/Materiales/Articulos/0086rabi.pdf

MATLAB: Acoustic Beamforming Using a Rectangular Microphone Array

The error is because you are adding noise to the angle. I believe it's a typo. That line should just reads like this

    temp=step(hCollector, x1,ang_dft)+sqrt(noisePwr)*rand(rs,NSamPerFrame,16);

Also, in the earlier part of the script, where you instantiate sigArray, it should be

    sigArray = zeros(NTSample,16);

HTH

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MATLAB: How to realzie iczt use Matlab

MATLAB: Acoustic Beamforming Using a Rectangular Microphone Array

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