Re: Use of floating point numbers ?
In binary FP, 0.1+0.9 (&suchlike) is not guaranteed to be 1.0
261 posts • joined 15 Dec 2011
managed to scan my copy:
At a symposium I attended in
Canada, Peter Vigor, then head of the Sandhurst Soviet Research and Study
Centre, was asked how a Soviet NCO might tell one of his men to do some
simple thing. His sample order contained, I think, seven words, five of them
variants on the soldierly expletive which the Russians, in a true spirit of
democracy, use freely through the ranks. This is a record I have only once
heard equalled. Working on a muddy side-slope, one of my Centurion crews
had just got a thrown track back on and tightened, when the track-adjusting
mechanism came away. Falling back into the mud with the 3-foot spanner
and its contents on top of him, the driver uttered the immortal phrase "The ****ing ****er's ****ed, **** it!" Perhaps Peter Vigor too was
indulging in a touch of poetic licence.
Got this query "why not test all possible ...") at Intel. Among other things, we had a 16/16 divide procedure that had "only" 4 billion possible combination; spent a few nights testing 10^8 of them at random -- on the ONE real chip we had at hand. (This is 1981, 1MHZ top instruction rate)
At Princeton U, there was a student lab to measure g using a pendulum. g was off more than it should have been. The prof investigated. Turned out the wall clock (used to measure pendulum period) ran off the local power company. The clock at the power company ran off same power. When 5PM approached, the workers' hand would move the generators a bit faster, so as to get home sooner. Hence wong g.
The Hebrew University got a PDP11/70 delivered, late on a Friday, on a pickup truck. They told us "600Kg, 6 packages". Turned out one package (the 11/70) was 500Kg.
We (the CS department) got it off the truck by tying ropes from it to a higher floor, letting the truck move, and putting a table to stop if moving (said table became matchwood). Let it there until Sunday, when the staff came in.
11/70 worked like a charm
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