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Basic Question about the function ztrans

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Nicholas
Nicholas 2016-12-20
评论： Nicholas 2016-12-20
Hi,
I have a vector which represents a signal sampled at 250Hz.
I would like to perform a z transformation on this vector, although I haven't had success thus far.
This is what I have tried:
%%Band Pass Filtering
ECG = load('Testm.mat');
d = designfilt('bandpassiir','FilterOrder',10, ...
'PassbandFrequency1',0.5,'PassbandFrequency2',50, ...
'PassbandRipple',3, ...
'StopbandAttenuation1',40,'StopbandAttenuation2',40, ...
'SampleRate',250);
FD = filter(d,ECG.val(1,:));
fvtool(d,'Fs', 250)
%%Zero Padding
B = padarray(FD, [0 4])
%%Unilateral Z transformation
syms k x
f = B(k)
ztrans(f,k,x)
Any suggestions would be helpful
thanks
Nic

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回答（1 个）

Walter Roberson
Walter Roberson 2016-12-20
syms k x
f = B(k)
However, indexing an array by a symbolic variable is not permitted.
ztrans is to be applied to a function, not to a vector of values.
Perhaps the code shown at https://www.youtube.com/watch?v=rLcKKMcfx9o is of interest.

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