zpk function is missing

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Arash Kohli 2021-3-29

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https://ww2.mathworks.cn/matlabcentral/answers/787184-zpk-function-is-missing

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.

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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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Answer 1

Fangjun Jiang 2021-3-29

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I believe zpk() requires Control System Toolbox. Check to see if you have it

ver control

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Arash Kohli 2021-3-31

Thank you. I have installed it.

taeho kim 2021-9-17

omg thank you so much

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Answer 2

Star Strider 2021-3-29

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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.

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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 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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Answer 3

Ahmed Redissi 2021-4-14

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https://ww2.mathworks.cn/matlabcentral/answers/787184-zpk-function-is-missing#answer_675081

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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);