Can anyone tell me the error with sum function?

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Swati Sarangi
Swati Sarangi 2019-12-11
评论： Bandar 2019-12-11
r=0.5;
n=0:10;
x=r.^n
s=sum(x)
What's the error with s?
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Alex Mcaulley
Alex Mcaulley 2019-12-11
What is wrong? It is the summation of a geometric progression and the result seems ok:
%Your code
r=0.5;
n=0:10;
x=r.^n
s=sum(x)
%General formula
s2 = x(1) + r*(x(end)-1)/(r-1)
s =
1.9990
s2 =
1.9990

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回答（1 个）

Steven Lord
Steven Lord 2019-12-11
Based on prior experience, I suspect you received the error "Array indices must be positive integers or logical values." If that's the case, clear the variable you've created named sum which is preventing you from calling the built-in sum function.

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