Re: Ceiling & Floor
- To: mathgroup at yoda.physics.unc.edu
- Subject: Re: Ceiling & Floor
- From: John Gray <gray at symcom.math.uiuc.edu>
- Date: Thu, 26 Mar 1992 16:32:41 -0600
The comments from Dave Withoff are useful, but still the following three
computations make one wonder what is really going on.
In[19]:= Ceiling[10^22 + 0.]
Out[19]= 10000000000000000000000
In[20]:= Ceiling[10^23 + 0.]
Out[20]= 99999999999999991611392
In[21]:= Ceiling[10^23 + 0.000000000000000000000000000]
Out[21]= 99999999999999991611392
Just for reference
In[22]:= {$Version, $MachinePrecision}
Out[22]= {SPARC 2.0 (July 8, 1991), 16}
One expects something to happen between 19 and 20 digits, but not between
22 and 23 digits.
John Gray