What is the MATLAB function for FILTER in direct-form I?

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I need of the code of this function, if it exists.
I just know about the function 'filter', but this function was implemented in direct-form II transposed and I need of the 'filter' that was implemented in direct-form I.
Thanks.

Answers (1)

Walter Roberson
Walter Roberson on 14 Jun 2019
Edited: Image Analyst on 17 Jun 2019
edit(which('dfilt.df1'))
Will show you the exact code that is used.

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