MATLAB: Question about the summation of array of elements with complex double

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Hi there, I have a strange problem when doing the summation for my array.
I got a array of 1×64 complex double. I would like to calculate the sum of those 64 elements.
However the result come out was quite strange and I don't know where I got wrong….
'sle' is the name of the data.
I did try with real(sle) and imag(sle). Although real(sle) did give me kind of a sensible answer(I suppose), in imag(sle) from element 33 to element 40 did show a imaginary value. Which is strange because when I look back at the data, there was no corresponding imaginary numbers that present in sle.
Anyone know the reason why? Please help… ><
sle = 
  1 至 7 列
   0.1250 + 0.0000i   0.1250 + 0.0000i   0.1250 + 0.0000i   0.1250 + 0.0000i   0.1250 + 0.0000i   0.1250 + 0.0000i   0.1250 + 0.0000i
  8 至 14 列
   0.1250 + 0.0000i  -0.1250 + 0.0000i  -0.1250 + 0.0000i  -0.1250 + 0.0000i  -0.1250 + 0.0000i  -0.1250 + 0.0000i  -0.1250 + 0.0000i
  15 至 21 列
  -0.1250 + 0.0000i  -0.1250 + 0.0000i   0.3750 + 0.0000i   0.3750 + 0.0000i   0.3750 + 0.0000i   0.3750 + 0.0000i   0.3750 + 0.0000i
  22 至 28 列
   0.3750 + 0.0000i   0.3750 + 0.0000i   0.3750 + 0.0000i  -0.3750 + 0.0000i  -0.3750 + 0.0000i  -0.3750 + 0.0000i  -0.3750 + 0.0000i
  29 至 35 列
  -0.3750 + 0.0000i  -0.3750 + 0.0000i  -0.3750 + 0.0000i  -0.3750 + 0.0000i  -0.1250 + 0.0000i  -0.1250 - 0.0000i  -0.1250 + 0.0000i
  36 至 42 列
  -0.1250 - 0.0000i  -0.1250 + 0.0000i  -0.1250 - 0.0000i  -0.1250 + 0.0000i  -0.1250 - 0.0000i   0.1250 + 0.0000i   0.1250 + 0.0000i
  43 至 49 列
   0.1250 + 0.0000i   0.1250 + 0.0000i   0.1250 + 0.0000i   0.1250 + 0.0000i   0.1250 + 0.0000i   0.1250 + 0.0000i  -0.3750 + 0.0000i
  50 至 56 列
  -0.3750 + 0.0000i  -0.3750 + 0.0000i  -0.3750 + 0.0000i  -0.3750 + 0.0000i  -0.3750 + 0.0000i  -0.3750 + 0.0000i  -0.3750 + 0.0000i
  57 至 63 列
   0.3750 + 0.0000i   0.3750 + 0.0000i   0.3750 + 0.0000i   0.3750 + 0.0000i   0.3750 + 0.0000i   0.3750 + 0.0000i   0.3750 + 0.0000i
  64 列
   0.3750 + 0.0000i
   
sum(sle)
ans =
  -1.7764e-15

Best Answer

sum(sym(m))
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