[daip] AIPS / POPS numerical precision

[Eric Greisen]

Walter Brisken writes:
 > 
 > After spending some time trying to understand why two of my coordinates 
 > didn't match after moving one of them (CLCOR), I came to the conclusion 
 > that the aips command interpreter is likely using low precision (32 bit 
 > floats) in its calculations.  I discovered it when calculating:
 > 
 > >print 51.052246-51.052300 
 > AIPS 1:    -0.00005341
 > 
 > whereas my handy python interpreter gives the more correct value
 > 
 > >>> 51.052246-51.052300 
 > -5.4000000005771653e-05
 > 
 > 
 > Would it be too much trouble to promote the internals of POPS to
 > double-precision?  Until then I will have to do these simple calculations
 > elsehow.
 > 

Yes - it would be too much trouble - every task would have to change
and the whole structure of the POPS interpreter.

Eric Greisen