Summation Problem With Error
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Find ∑(xi+i)2 for i=4 to 163
xi represents the 'i'th value in the list of x values.
This is what I have coded...
x=0;
for i=4:163;
x=(x+x(i)).^2;
end
x
But it says this:
Index exceeds the number of array elements (1).
x=(x+x(i)).^2;
回答（2 个）
madhan ravi
2018-11-21
编辑：madhan ravi
2018-11-21
0 个投票
x is only defined as a scalar value which is zero so when you try to acess 2nd element it gives an error. Cumsum/symsum is recommended for your case.
Walter Roberson
2018-11-21
编辑：Walter Roberson
2018-11-21
0 个投票
i = 4:163;
sum( (i+x(i)).^2)
This expects x to already have been defined
2 个评论
Torsten
2018-11-21
I think you mean "i" instead of "ii".
Walter Roberson
2018-11-21
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2018-11-21
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