
I am working in R language.
I have two arrays denoted E and y. E is indexed as E[state], and y as y[time,sample]. Thus, E is 1 dimensional, and y is 2 dimensional.
I have to calculate the following 3 dimensional array, denoted as P.
P(state,time,sample) = f(E(state),y[time,sample]), where f is some function. I wanted to do this without using loops.
Sample code is as follows.
# EM algorithm for HMM
#y is array containing data
T #length of time series
nsamples #number of sequences observed
nstates # no. of states in HMM
P_forward<array(0,dim=c(nstates,T,nsamples)) #forward probabilities in
#EM algo. for HMM
P_forward[state,time,sample] = 1/abs(E[state]y[time,sample])
