I need a fast way in Matlab to do something like this (I am dealing with huge vectors, so a normal loop takes forever!):
from a vector like
[0 0 2 3 0 0 0 5 0 0 7 0]
I need to get this:
[NaN NaN 2 3 3 3 3 5 5 5 7 7]
Basically, each zero value is replaced with the value of the previous non-zero one. The first are NaN
because there is no previous non-zero element
in the vector.
Try this, not sure about speed though. Got to run so explanation will have to come later if you need it: