zpk function is missing

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Arash Kohli
Arash Kohli 2021-3-29
评论： taeho kim 2021-9-17
I am using MATLAB R2020b, and Signal processing toolbox Ver. 8.5. The "zpk" function does not work. I have already tried following recommendation but no success:
restoredefaultpath
rehash toolboxcache
Please help me.
  1 个评论
Fangjun Jiang
Fangjun Jiang 2021-3-31
There is no zpk() function in Signal Processing Toolbox Ver 8.5. What is the error of zpk() in R2020b if you have the Control System Toolbox?

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回答（3 个）

Fangjun Jiang
Fangjun Jiang 2021-3-29
I believe zpk() requires Control System Toolbox. Check to see if you have it
ver control
Star Strider
Star Strider 2021-3-29
In the Signal Processing Toolbox, the [z,p,k] output is optional for several filter design functions. Use those with (for example) zp2sos or others to design the filter to be used with filtfilt to filter a signal.
  2 个评论
Arash Kohli
Arash Kohli 2021-3-31
Thank you,
I have to add some parts to an existing program which is using zpk. Is there any toolbox in which the zpk is included?
Star Strider
Star Strider 2021-3-31
There are sevral. One zpk is in the Control System Toolbox, another zpk (introduced in R2014a) is in the Signal Processing Toolbox. (There are others as well, however I do not have those Toolboxes.)
Choose the one that works in the context of what you are doing.

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Ahmed Redissi
Ahmed Redissi 2021-4-14
Hi,
While there is no "zpk" function in the Signal Processing Toolbox, there is a method called "zpk" of the object "digitalFilter". If you have the Signal Processing Toolbox, you can call the "zpk" function if the input is a digitalFilter object. Here's an example:
hpFilt = designfilt('highpassiir','FilterOrder',8, ...
'PassbandFrequency',75e3,'PassbandRipple',0.2, ...
'SampleRate',200e3);
[z,p,k] = zpk(hpFilt);
You can learn more about it here:
https://www.mathworks.com/help/signal/ref/zpk.html

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