multiply along

2012 6 6
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~EDITED'
Hi there, I have a long matrix 1000 x 34 want to do the cumulative multiplication left to right to give a 1000 x 1 matrix then the sum of the multiplication going downwards. So like a sum function but multiplying each element going sideways then downwards.
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Oleg Komarov
Oleg Komarov 2012-6-6

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sum(cumprod(A))

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Mate 2u
Mate 2u 2012-6-6
What if their are zeros. Is there a line code to change all zeros to 1s?
Walter Roberson
Walter Roberson 2012-6-6
T = A;
T(T==0) = 1;
sum(cumprod(T))

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Walter Roberson
Walter Roberson 2012-6-6

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If the numbers are strictly positive, you could log() and cumsum() and exp() the result.

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