Plot adaptive filter coefficients

Hello,

I would like to plot the time series of the coefficients from an adaptive filter object, in order to watch the convergence of my filter coefficients. How can I do this?

For example, using the example provided at the bottom of http://www.mathworks.com/help/dsp/ref/adaptfilt.html

How do I plot the time series of filter coefficients for each step, rather than just the final values?

Thanks

Answer 1

[Puneet Rana]

There are a lot of ways to achieve this:

• Use XY Graph for convergence: http://www.mathworks.com/help/dsp/examples/adaptive-filter-convergence.html
• Use Waterfall Scope for 3-D representation: http://www.mathworks.com/help/dsp/examples/acoustic-noise-cancellation-lms.html
• Use Time Scope for learning curve of filter: http://www.mathworks.com/help/dsp/examples/system-identification-using-rls-adaptive-filtering.html

[Cory Larsen]

So I have to use simulink to do this, I cannot do it in code? I can generate the learning curves based off the filter error returned, but I cannot determine how to plot the time series of the coefficients.

Thanks

[Puneet Rana]

Coefficients are vectors at every time step. Do you mean you want to have a 3-D plot that shows progressive change of the values of that vector across time?