```Date: Jan 28, 2013 6:53 AM
Author: Barry Shaw
Subject: Re: Cumulative sum

for i = 1 : 5     if issorted(flipud(hewson([1:2],i))) %assumes that you only care about top 2 elements          hewson(:,end+1) = cumsum(hewson(:,i),1)     endendhewson =     1     5     8     4     7     8     3     6     4     7     9    12     3     6     7     9     5    19     2     5     6     7     5    25Barry"sam" wrote in message <ke5kpo\$gjt\$1@newscl01ah.mathworks.com>...> I am new to Matlab and trying to create a a fairly simple matrix. one of my columns i want to be the cumualtive sum of another column. For example the below matrix, i want the next column (6) to be the cumulative sum of column 3 as it decends. so the first number will be 8 then the second number will be (8+4) 12 then the third will be (8+4+7) 19 and so on. > > 1 5 8 4 7 > 3 6 4 7 9 > 3 6 7 9 5 > 2 5 6 7 5> > i havetried various ways such as the one below but with no success, can anyone please tell me where i am going wrong?> hewson is the name of my matrices> > for r = 1:20> for c=6>        hewson (r,c) = cumsum(r,3);>     end> end> > Many Thanks> sam
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