System Identification Toolbox not importing data properly
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I am using the system identification toolbox to identify a transfer function using a bode plot. I have used it in the past without much errors
I'm currenlty using: import data --> frequency domain data --> frequency function (Amp/Phase)
The the amplitude that is imported seems to be backwards and scaled and the phase just seems to be scaled. I am not sure what is wrong, I have closed System Identification toolbox, restarted matlab, with no success
Update: The toolbox seems to take the absolute value of my amplitude plot and shift my phase to positive.
The following is the original data
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/458190/image.png)
The following is the imported data, it ooks very distorted and is clearly not what is in the original data.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/458195/image.png)
Here are the settings I am using:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/458200/image.png)
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Accepted Answer
Mathieu NOE
on 13 Dec 2020
hello
seems you are giving the amplitude in dB whereas the ID toolbox parameters is waiting for a linear scale amplitude
so you have to do first a dB to linear amplitude conversion
a_lin = 10.^(a_dB/20)
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