Problem in finding ABS of a complex number of 2D matrix

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Bharath 2015-2-17

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评论： Bharath 2015-2-17

I've created a 2D matrix of size 4096x28 which contains complex numbers generated after performing FFT on a raw signal. Now I'm trying to find abs of the complex numbers in this matrix. But I get an error my code and error are as follows

%fft for X signal
fftx=fft(reshape(T_hor,4096,[]));
%Xn value of the complex signal 
Xn = abs(fftx);
%phase angle for X signal
alpha = angle(fftx);
%FFT for Y signal
ffty= fft(reshape(T_ver,4096,[]));
%Yn value for the complex signal
Yn=abs(ffty,NFFT);
%phase angle for the second signal
beta=angle(ffty);
I get this error
"??? Error using ==> abs
Too many input arguments.
Error in ==> Test_run_discard_AU_2 at 31
Yn=abs(ffty,NFFT);"

Any hints or suggestions would be really helpful. Thanks in advance.

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Stephen23 2015-2-17

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编辑：Stephen23 2015-2-17

abs only accepts one input argument, whereas you are trying to use it with two: abs(ffty,NFFT).

In fact abs is defined as a unary operation , so what operation are you hoping to achieve by providing it with two arguments?

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Yoav Livneh 2015-2-17

在 MATLAB Online 中打开

Use

Yn=abs(ffty);

like Stephen Cobeldick said, and you should be fine.

Bharath 2015-2-17

Sorry guys! Little confused. I used only one argument for abs for fftx but ffty I made a mistake. I didn't see that. So I was thinking something else. Thanks again for your valuable time.

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