How do I product elements of a vector?

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cfjunior
cfjunior le 22 Oct 2013
Commenté : cfjunior le 22 Oct 2013
Hi,
I have this matrix (3000 by 2) and I want the product of a range of elements in the second column. All of the elements are equal to 0.99 in a initial stage, but its gonna change after some further steps. I tried to use 'prod' but it didn't work...
Ex. matrix named 'aux'
prod(aux(2500,2):aux(2700,2)); It always returns me 0.99 no matter the range...
How do I do it?
tks
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cfjunior
cfjunior le 22 Oct 2013
or example:
A = [71 2; 72 2; 73 2; 74 2; 75 2];
and I want the product of the second element till fourth element (in sequence)
so, I want 2 x 2 x 2 = 8 ...
cfjunior
cfjunior le 22 Oct 2013
I got it, thanks!

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Azzi Abdelmalek
Azzi Abdelmalek le 22 Oct 2013
Modifié(e) : Azzi Abdelmalek le 22 Oct 2013
A = [71 2; 72 2; 73 2; 74 2; 75 2];
prod(A(2:4,2))

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