[Octave-bug-tracker] [bug #47063] computation between single and double performed with single precision

[Carnë Draug]

URL:
  <http://savannah.gnu.org/bugs/?47063>

                 Summary: computation between single and double performed with
single precision
                 Project: GNU Octave
            Submitted by: carandraug
            Submitted on: Fri 05 Feb 2016 02:45:01 GMT
                Category: None
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Inaccurate Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: GNU/Linux

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Details:

An operation between a double and a single returns a single for Matlab
compatibility. However, it seems that Matlab actually performs the
computations with doubles. See
https://stackoverflow.com/questions/35213845/subtracting-double-precision-from-single-precision-gives-me-0-not-what-i-want


## in octave
octave> single (sin (10)) - sin (10)
ans = 0
octave> single (double (single (sin (10))) - sin (10))
ans =   -1.8719e-08

----------

## in matlab
>> single (sin (10)) - sin (10)

ans =

 -1.8719e-08






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