How to take slice of array without it turning into vector

[DNF]

@kw_martin

Gunnar, my understanding is it’s better to use columns for the variable that iterates in the inside loop. For filters, I tend to reserve this for containers that have elements changing with time. Hence, the use of rows for each stage of a cascade filter.

This isn’t really clear to me. Isn’t the ‘inner loop’ necessarily along the filter coefficients, not across the different filters?

@kw_martin

My personable opinion (not shared by others as far as I can tell), is that complex signal processing is actually cleaner and simpler than “real” signal processing.

Is this in reference to something in this thread?

[kw_martin]

Re your second comment; not really relevant, just some
background. Re your first comment: there is some choice here. For
complex cascade filter banks, there are actually three loops; one
for each filter in the bank (currently 256); one for each stage in
each cascade filter, and one for each input sample that goes to
all of the filter banks. The order in which each loop is done is
one of the design choices; currently, I am focusing on just
getting the filters working (yesterday I was successful in this
regard), and I will leave optimization to later once I have all of
the pieces in place for ECG analysis (just on clean signals for
now).