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Re: arithmetic issues
| From: Thomas Bushnell BSG <tb@xxxxxxxxxx>
| Date: Sun, 23 Oct 2005 12:39:43 -0700
| Aubrey Jaffer <agj@xxxxxxxxxxxx> writes:
| > When different NaNs are returned depending on the circumstances
| > creating them, I would like my implementation to display them
| > like this:
| > #<not-a-number expt>
| Sure, that seems fine. We could mandate that as the readable written
It should *not* be a readable representation. That serves only to
mask mathematical errors in saved datasets. As Bakul Shah wrote:
"... IEEE754 says NaN is the result of an *invalid* operation, when an
operation's operands lie outside its domain."
And literal NaNs will find precious little use in programs if all
equality predicates return #f for them!