How to create this function in Matlab?

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vish
vish 2011-3-25
I want to write a mathematical function in matlab so that I can call it in my program whenever needed.
? a(n).b(n)/sqrt((a(n)^2) + (b(n)^2))
n=0 to limit. The limit is approx 1000.
a and b are 1 dimensional matrix. size of a and b is : (1xlimit)
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vish
vish 2011-3-26
Thanks, I just tried it. Its working. Matlabs really powerful. I am grateful for showing me the snippet.

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采纳的回答

Walter Roberson
Walter Roberson 2011-3-25
Assuming the '?' is the summation operator, then:
sum(a.*b./sqrt(a.^2 + b.^2))
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Matt Fig
Matt Fig 2011-3-25
Beat me too it! I was too slow deciphering the question, I guess.

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Matt Fig
Matt Fig 2011-3-25
If I understand you correctly,
function S = mysum(a,b)
S = sum(a.*b./sqrt(a.^2 + b.^2));
EDIT
.
. Sean de points out known stability issues with square roots of the sum of squares.
function S = mysum(a,b)
S = sum(a.*b./hypot(a,b));

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