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Sum of a Series

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Laura
Laura 2013-3-2
Hi, I am struggling with how to take the sum of the following say i have a vector
A=[1 0 1 0 1 1 0 1 0 1 0]
with L=length(A)
and i want the sum from i=1 to L-1
of the expression
A(i)*(1-(A(i+1)))
i have figured out away to do this with a for loop but is there any way i could do it without?
Thank you in advance for any help.

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回答（2 个）

Azzi Abdelmalek
Azzi Abdelmalek 2013-3-2
编辑：Azzi Abdelmalek 2013-3-2
A=[1 0 1 0 1 1 0 1 0 1 0]
a=A(1:end-1);
b=A(2:end)
out=sum(a.*(1-b))
Wayne King
Wayne King 2013-3-2
A = [1 0 1 0 1 1 0 1 0 1 0];
B = A(2:end);
C = sum(A(1:end-1).*(1-B));

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