zpk function is missing
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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
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?
回答（3 个）
Fangjun Jiang
2021-3-29
I believe zpk() requires Control System Toolbox. Check to see if you have it
ver control
Star Strider
2021-3-29
0 个投票
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.
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:
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在 帮助中心 和 File Exchange 中查找有关 Digital Filtering 的更多信息
2021-3-29
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