Unlimited precision in APL?

: Is there any APL interpreter available for the PC which

: permits unlimited numerical precision? (i.e. many digits

: more than the 16 or-so one gets with most languages which

: store double-precision numbers in the IEEE 8-byte format)

...

: -----------------------------------------------

: National Physical Laboratory, UK

: FAX: +44-(0)81-943-6453

: -----------------------------------------------

I don't know of any. There was at one point a remark on the net that this

might not be too hard to add to J. I hope it is added to J someday.

I am in the slightly embarrasing position of having worked on a math

recreation problem (that will be published, I think) where the editor/poser

asked for code. I provided the "biggest known" example using some trival

J and the example was 14 digits. It became clear others were going to soon

beat my record so I recoded in Mathematica - not so hard really, and soon had

24 digit examples. I suspect that my "solution" will be the 24 digit example

with the J code that would not work because of precision limits.

I realize that check writing programs don't need 40 digits, but these

things are of real interest to me.

Cliff

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Clifford A. Reiter

Mathematics Department, Lafayette College

Easton, PA 18042 USA, 610-250-5277