Extract data from fvtool output

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Mark Thompson 2016-10-25

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https://ww2.mathworks.cn/matlabcentral/answers/308979-extract-data-from-fvtool-output

评论： Star Strider 2016-10-25

Hi there,

I am designing a filter using MATLAB's Filter Design Tool, however I need to verify certain data points in the response. In particular the group delay values. FVTool allows you to view the results of different responses (e.g. see following image), but I need a means of extracting the response data for further use in my code. How can I extract the group delay (or magnitude and phase) data from the filter design tool?

How can I export that curve?

Thanks for any assistance you can offer me!

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Answer 1

Star Strider 2016-10-25

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https://ww2.mathworks.cn/matlabcentral/answers/308979-extract-data-from-fvtool-output#answer_240516

I don’t routinely use fvtool, so my experience with it is limited. See the section on Modifying the Plot in the fvtool documentation. That will probably let you do what you want.

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Mark Thompson 2016-10-25

Thank you for the suggestion, however I have already looked at that page and I have found no way of exporting the graphed data into a vector that can be later manipulated in the MATLAB workspace.

Is there perhaps a means of generating group delay and frequency response data from the [b,a] coefficients in a MATLAB script (without using the filter design tools) that mean they can be plotted manually later?

Star Strider 2016-10-25

My pleasure.

You canâ€™t get there from here with fvtool. Itâ€™s designed to graphically let you explore the characteristics of your filter in a GUI.

Since youâ€™ve already designed your filter, use the grpdelay, phasedelay, and related functions in the Signal Processing Toolbox to get the results you want.

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