use the previous result of a function in the calculation

I want to perform a calculation: , how can I include the Y(i-1) part? Obviously a loop would work, but my data set is quite large so a loop takes a while to execute.

Is there a better way?

Answer 1

[David Goodmanson]

Hi Matthew,

there is definitely a better way.

Y = filter(B,[1 -A],X)

Here the assumption is that X is an input vector and B is a scalar constant. See help for filter for the input conventions.