convert binary vector to time series of sum(x)/minute

Dear members,

I apologize for the relatively simple request, but I couldn't find exactly
what I was looking for. I have a binary vector [1,0] representing
presence/absence at 1 second intervals over length(N). I would like to
convert this to a new time series vector with N/60 elements that represent
the sum of x/minute. 

In other words, I'd like to get from:

e.g. x = [1,0,1,1,0,1,1,1,0,0,0,1,0,1, ... ] *N=6,000

to

e.g. x = [35, 40, 10, 29, ... ] *where each element has min=0 and max=60
over length N=100

Thanks so much,

mac
Kyoto University, Japan

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