Does 'i' after value stand for 'index', and if so why does it appear as part of the answer?

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I am trying to calculate the Euclidean distance between two images vectors of 4096 values that are contained in a file called allData (see pic) with the command:
Dist = sqrt(sum((allData(1) - allData(3) .^ 2)))
the answer that was returned was
0.0000 +19.1794i
does this answer seem correct or is the 'i' returned because im indexing into a matrix and im just getting returned one of the values from that image vector or am i being returned the distance between the two rows?

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Roger Stafford
Roger Stafford 2018년 3월 24일
편집: Roger Stafford 2018년 3월 24일
The 'i' in your result indicates a complex answer. I assume you are familiar with complex numbers. The 'i' represents the square root of minus one. This is caused by your attempt to take the square root of a negative number. Apparently allData(1) is less than the square of allData(3).
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