How is the filter function algorithm implemented in MATLAB?

y = filter(b,a,x,zi,dim)

How does zi,b, and a fill in and compute in this function?

Answer 1

[Jan]

The code is shiown in the last paragraph. So you have posted a valid answer to your question already.

You find a corresponding implementation as M-code here: https://www.mathworks.com/matlabcentral/answers/9900-use-filter-constants-to-hard-code-filter#comment_2203200

[亚威 高]

Hi, suppose I have a vector zi that already exists, and I need to know how the vector zi is used in the calculation, and there seems to be no clear explanation, thanks

[亚威 高]

Thank you very much. I totally understand