Ted,
>A machine word on a Cray is 64 bits. The default precision is single. Double
>precision is 128 bits and significantly slower.
>
>Does that answer your question? ;-)
Yes, your use of the word "significantly" does indeed answer my question.
As I said previously, I am using an Alpha box (VMS) and finding that the
difference between single and double precision is no longer as much a time
problem as used to be. Our programs are now running in minutes rather than
hours/days several years ago. Changing our programs has enabled us to consider
larger (less numerically stable in single precision) problems, and our real
world has become larger over the last few years (interconnection of more states
in the Australian electrical environment).
Cray's single is the size of VMS double, so I should be comparing quad on my
machine with your double (a recent thread on c.l.f)
Regards, Paddy
Paddy O'Brien,
Transmission Development,
TransGrid,
PO Box A1000, Sydney South,
NSW 2000, Australia
Tel: +61 2 9284-3063
Fax: +61 2 9284-3050
Email: [log in to unmask]
Either "\'" or "\s" (to escape the apostrophe) seems to work for most people,
but that little whizz-bang apostrophe gives me little spam.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|