matlab - summing matrix columns based on another matrix -


i have 2 matrices of same size.

first matrix: weights 800 x 1250 second matrix: country_code 800 x 1250

each column observation.

what sum each column in weights matrix based on country_code. example below might explain better

weight                          country_code   20   25  30  15  20        12   12  12  12  12  40   10  20  5   10        10   10  10  10  10  10   35  25  50  40        5    5   5   5   5  30   30  25  30  30        12   12  12  12  12  list of country codes      result matrix      5                         10   35  25  50  40                         10                        40   10  20  5   10                   12                        50   55  55  45  50

my code follows doesn't give me correct answers. 

int_ccy - number of unique country codes ccy - vector of unique country codes   t = 1 : int_ccy     wgts(t, :) = nansum(weight(country_code==ccy(t, 1), :));      end

the following should solve problem, although there's nicer way using logical indexing (i think) can't recall off top of head:

for t = 1 : int_ccy;     wgts(t,:) = sum(weight .* (country_code == ccy(t, 1)), 1);     end

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