Vector values replaced by zeros

Question

Dan Pron 2015-3-18

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/183869-vector-values-replaced-by-zeros

评论： Image Analyst 2015-3-18

Hello everyone.

I'm working with a dataset (excel file with columns of different variables, with a lot of values for each of them) and trying to do regressions, but i'm facing a problem : when i run vectors that contain values bigger than 1, then matlab seems to replace all values by zeros. Here is a piece of my code:

"

MMData=dataset('XLSFile', 'DescriptiveStatsCorrectedV4.xlsx');

A=MMData.roa;

B=MMData.assets;

C=MMData.roe;

D=MMData.percfemborrowers;

"

A (roa) and D (percfemborrowers) have only values <1 (in absolute value), so no problems with them.

B (roe) and C (assets) have values >1 (in absolute value), and this is what matlab diplays for them for example :

Could someone help me? Thanks

ps : A weird fact : calculating the mean of one of this vector (ex: for C) still works...

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Answer 1

James Tursa 2015-3-18

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/183869-vector-values-replaced-by-zeros#answer_171830

编辑：James Tursa 2015-3-18

在 MATLAB Online 中打开

The values in all likelihood are not exact 0's, they just display as 0's to the precision that is printed. To print more digits, e.g.,

format long

or

format long g

Also pay attention to any exponent that appears at the start of the display. E.g.,

>> a = [1 1e-7]
a =
    1.0000    0.0000  % a(2) displays as all 0's
>> a(2)
ans =
   1.0000e-07  % but a(2) is really the original 1e-7 value
>> a*10000
ans =
 1.0e+04 *
  1.0000    0.0000
>> format long g
>> a
a =
                       1                     1e-07