How to create this function in Matlab?

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vish 2011-3-25

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采纳的回答： Walter Roberson

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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Matt Fig 2011-3-26

Did you try the codes below?

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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Walter Roberson 2011-3-25

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在 MATLAB Online 中打开

Assuming the '?' is the summation operator, then:

sum(a.*b./sqrt(a.^2 + b.^2))

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Matt Fig 2011-3-25

Beat me too it! I was too slow deciphering the question, I guess.

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Matt Fig 2011-3-25

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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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Sean de Wolski 2011-3-25

I would use:

./hypot(a,b)

Matt Fig 2011-3-25

That too...

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