Re: How stable is the 32K HP42S?? Message #11 Posted by ExPPC member on 23 May 2002, 4:32 a.m., in response to message #10 by Karl Schneider
Mr. Schneider wrote:
"I think the condescending tone is a bit uncalledfor."
There's no 'condescending' tone whatsoever in my reply,
sir, I simply state the fact as it seems to me. As a
proof of your alleged limited imagination, you continued:
"Those who visit remote sites while packing lightly, probably have ample time and patience to handenter up to 4000+ floatingpoint numbers on a small keypad"
ssential."
It's obvious that your imagination only goes as far as
to assume that 32 Kb are only useful for data if said
data implies entering 4000 numbers from the keyboard,
which justly seems to you as a nightmare scenario.
But entering that many numbers manually is far from the
only possibility. Those 4000 numbers can be computed
internally from very few input data, then used in
subsequent calculations.
For instance, to fit a set of as few as 60 empirical
data pairs to a suitable polynomial curve which will pass
through all of them, you first need to enter just said 60 data
pairs, for a total of only 120 numbers entered by the
user. But then the program needs to construct a 60x60
matrix (i.e: 3600 numbers) and solve the corresponding linear system,
the final result being just another set of 60 numbers,
the coefficients of the polynomial.
So you see, here we have a problem (and a very typical
one, at that) where you just input 60 numbers and after
a while you get another 60 numbers as a result. Yet you
need to deal with 3600 numbers internally, and you'd
better have the memory available when the need arises.
See my point ?
That said, please accept my sincere apologies if you felt
my comments were derogatory to you in any way.
