Problem finding sum of array using vectorization

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Jade March
Jade March 2021-12-15
编辑： James Tursa 2021-12-15
Trying to find the sum of this array using vectorization, the value of the sum should be 0.74 but when I run it I am getting 'ans = -Inf'. Where am I going wrong?
x = sym(1) ./ (1:9)
1 - sum( +1./((x)-1) ./ x )

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回答（1 个）

James Tursa
James Tursa 2021-12-15
The first element of x is 1, so that element produces 1/(1-1) = 1/0 = inf in the second line. You need to rewrite that second line.
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Jade March
Jade March 2021-12-15
Thank you! I know I need to rewrite the second line, I'm just not sure how to as I am new to MATLAB. Would you please be able to explain how?
James Tursa
James Tursa 2021-12-15
编辑：James Tursa 2021-12-15
You just need a vector that alternates +1, -1, +1, -1, etc. to use for the sign, right? Hint: Start with mod(1:9,2) and see if you can manipulate it into what you want.

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