How to assign negative and positive values to specific numbers in array?

Question

Zach Dunagan 2017-10-20

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/362260-how-to-assign-negative-and-positive-values-to-specific-numbers-in-array

评论： Zach Dunagan 2017-10-20

采纳的回答： KSSV

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How would I flip the signs in the array? a = xp', where 'a' is the array.

ans =

    0.0581
    0.0562
    0.0544
    0.0525
    0.0506
    0.0488
    0.0469
    0.0450
    0.0431
    0.0412
    0.0394
    0.0375
    0.0356
    0.0338
    0.0319
    0.0300
    0.0281
    0.0262
    0.0244
    0.0225
    0.0206
    0.0188
    0.0169
    0.0150
    0.0131
    0.0112
    0.0094
    0.0075
    0.0056
    0.0038
    0.0019
         0
   -0.0019
   -0.0038
   -0.0056
   -0.0075
   -0.0094
   -0.0112
   -0.0131
   -0.0150
   -0.0169
   -0.0188
   -0.0206
   -0.0225
   -0.0244
   -0.0262
   -0.0281
   -0.0300
   -0.0319
   -0.0338
   -0.0356
   -0.0375
   -0.0394
   -0.0412
   -0.0431
   -0.0450
   -0.0469
   -0.0488
   -0.0506
   -0.0525
   -0.0544
   -0.0562
   -0.0581
   -0.0600
    I need all negative numbers to be positive and all positive numbers to be negative. Sign needs to flip after the zero in the middle of the array.