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Re: st: digits difference between stata and mata


From   Nick Cox <njcoxstata@gmail.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: digits difference between stata and mata
Date   Mon, 13 May 2013 08:00:39 +0100

Please note: "Stata", "Mata", as at

http://www.stata.com/support/faqs/resources/statalist-faq/#spell

What you see is is likely just to be a side-effect of different
default formats. You can arrange the same format. Look at -help
format-.

. sysuse auto
(1978 Automobile Data)

. gen gpm = 1/mpg

. list gpm in 1/10

     +----------+
     |      gpm |
     |----------|
  1. | .0454545 |
  2. | .0588235 |
  3. | .0454545 |
  4. |      .05 |
  5. | .0666667 |
     |----------|
  6. | .0555556 |
  7. | .0384615 |
  8. |      .05 |
  9. |    .0625 |
 10. | .0526316 |
     +----------+

. mata
------------------------------------------------- mata (type end to
exit) ---------------

: gpm2 = st_data(., "gpm")

: gpm2[(1..10)]
                  1
     +---------------+
   1 |  .0454545468  |
   2 |  .0588235296  |
   3 |  .0454545468  |
   4 |  .0500000007  |
   5 |  .0666666701  |
   6 |   .055555556  |
   7 |  .0384615399  |
   8 |  .0500000007  |
   9 |        .0625  |
  10 |  .0526315793  |
     +---------------+

: strofreal(gpm2[(1..10)], "%5.4f")
             1
     +----------+
   1 |  0.0455  |
   2 |  0.0588  |
   3 |  0.0455  |
   4 |  0.0500  |
   5 |  0.0667  |
   6 |  0.0556  |
   7 |  0.0385  |
   8 |  0.0500  |
   9 |  0.0625  |
  10 |  0.0526  |
     +----------+

: end
-----------------------------------------------------------------------------------------

. format gpm %5.4f

. list gpm in 1/10

     +--------+
     |    gpm |
     |--------|
  1. | 0.0455 |
  2. | 0.0588 |
  3. | 0.0455 |
  4. | 0.0500 |
  5. | 0.0667 |
     |--------|
  6. | 0.0556 |
  7. | 0.0385 |
  8. | 0.0500 |
  9. | 0.0625 |
 10. | 0.0526 |
     +--------+

Nick
njcoxstata@gmail.com


On 13 May 2013 07:50, Wu Zhang <wuzhang50@yahoo.com> wrote:

>   I have a variable list which has different digits after being imported into MATA; I take a snap of the whole picture:
>
> In stata:
>
> --------------------------------------------
> 1.  9.477003   8.210668     59.375    -2.00877
> 2.   9.34036   9.473704    66.0647   -1.543392
> 3.  8.986102   8.188967   53.92946   -.5894488
> 4.  9.285332   9.773379   73.92938   -.2278635
> 5.  9.286468   9.812742   57.82097   -.0813199
>
>
>
> While in MATA:
>     1     9.477003098    8.21066761    59.375          -2.008770227
>     2    9.340359688    9.473704338    66.0647049    -1.54339242
>     3    8.986102104    8.188966751    53.92946243   -.5894488096
>     4    9.285331726    9.773379326    73.92938232   -.2278635055
>     5    9.286467552    9.812742233    57.82096863   -.0813199058
>
>
> Note that what we see in STATA is the same as in the data editor view.
>
>
> I am just wondering whether there is a way to make them the same?
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