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- To: <firstname.lastname@example.org>
- Subject: floats
- From: email@example.com
- Date: Wed, 19 Nov 97 11:31:11 -0500
- Return-receipt-to: <firstname.lastname@example.org>
I am having a *very* nasty problem. I want all my floats to be double.
Always. I set *default-float-format* to 'double-float, *and* set the
vars as 0.0d0. And still end up with numbers like 644151.75f0. I am
loosing precision and getting complex numbers instead of reals when
taking sqrt of -0.00000whatever which I get instead of +0.0d0 because
of loss of precision.
The case in question is:
(let ((yy 0.0d0))
(dolist (lambda (xx) (incf yy xx)) '(some list of floats)))
(the floats in the list are read from a file, and I don't mind that
they are singles, although I don't understand why they are since I do
This can be traced to
> (+ 0.0d0 1233456.2345f0)
which is quite outrageous, since *I* would expect it to be double on
the grounds of double + single = double no matter what! :-)
What is going on?