"lady firmament" <email@example.com> wrote in message news:firstname.lastname@example.org... > Hi! > Dear, > What is causal and acausal low passed filter. What is their usage and > purpose. > Please kindly .
These sound more like general signal processing questions, not directly related to MATLAB. You should ask them on a signal processing newsgroup like comp.dsp (available via Google Groups if you don't have access to another news server that carries it.)