On 8/6/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: > Yes, sure if it fails you might get wet, but I would try the few planks I > got and see which one fits best and not bother with a mathematical model. > All a bit academic as you don't know the situation > I am dealing with.
Even in the simplest situation it pays to have a minimum of context analysis before starting the construct. The obvious solution is probably to just extend planks across the river, but if you stop to think a little you may remember the water level on Winter is much higher than the current levels, meaning a much higher pressure of the water on the bridge (and helps to know if it increases in a logarithmic or linear way). By applying the right engineering techniques you at least know the limits of the wood construction you just built, and maybe manage to solve the problem with less resources by having the bridge built in a special way, like in an U shape to increase strength against the current. Regards, ~Nuno Lucas > > RBS > > > > Absolutely. Big bridge or small bridge, if it fails you fall in the > > water. > > > > It looks as if the bridge in Minneapolis failed because construction > > workers moved tons of repaving material onto part of it and overstressed > > that section. A few calculations could have saved the catastrophe. > > > > I saw an estimate that software errors cost just the US more than $100 > > billion per year. That is equivalent to more than 5% of the entire UK > > GDP. Doesn't it make sense to try to build software which works to > > design rather than trying alternatives until one which does not fail > > eventuates? > > > > Also note what early researchers in proof of software accuracy pointed > > out. Testing only finds bugs, it does not establish the correctness of > > a program. Only an appropriate design methodology can hope to establish > > correct behaviour of the program. > > > > RB Smissaert wrote: > >> Poor comparison in this case. > >> Are you going to make a mathematical model when you got a little stream > >> to > >> cross and you have a few available planks to do it? > >> > >> RBS > >> > >> > >> -----Original Message----- > >> From: John Stanton [mailto:[EMAIL PROTECTED] > >> Sent: 05 August 2007 16:43 > >> To: sqlite-users@sqlite.org > >> Subject: Re: [sqlite] Re: Re: Re: Re: Re: Re: Re: How does SQLite choose > >> the > >> index? > >> > >> We learn mathematics etc so that we can make numerical models which give > >> us design information. Imagine trying to build every combination of a > >> bridge to settle on a design! > >> > >> Make a mathematical model and get it close to optimal at the first > >> attempt. > >> > >> RB Smissaert wrote: > >> > >>>Yes, I suppose you are right there. > >>>I will see if I can put together a report that runs all possible types > >>> of > >>>queries (sequentially) and then see if I have left anything out that > >>> would > >>>cause problems. > >>> > >>>RBS > >>> > >>> > >>>-----Original Message----- > >>>From: Gerry Snyder [mailto:[EMAIL PROTECTED] > >>>Sent: 05 August 2007 03:35 > >>>To: sqlite-users@sqlite.org > >>>Subject: Re: [sqlite] Re: Re: Re: Re: Re: Re: Re: How does SQLite choose > >> > >> the > >> > >>>index? > >>> > >>>RB Smissaert wrote: > >>> > >>> > >>>>.... I think an application that > >>>>would produce all the needed indexes based on the table and all the > >>> > >>>possible > >>> > >>> > >>>>queries would be helpful. Anybody done such an app? > >>> > >>>_All_ possible queries? Not practical for any significant number of > >>>columns. N factorial gets big fast. > >>> > >>>The indexes would be much larger than the data base itself. > >>> > >>>I'm afraid you are going to have to settle for doing an intelligent > >>>design of the data base. > >>> > >>> > >>>Gerry > >>> > >>> > >>> > >> > >> ---------------------------------------------------------------------------- > >> > >>>- > >>>To unsubscribe, send email to [EMAIL PROTECTED] > >>> > >> > >> ---------------------------------------------------------------------------- > >> > >>>- > >>> > >>> > >>> > >>> > >>> > >> > >> ---------------------------------------------------------------------------- > >> - > >> > >>>To unsubscribe, send email to [EMAIL PROTECTED] > >>> > >> > >> ---------------------------------------------------------------------------- > >> - > >> > >> > >> > >> ---------------------------------------------------------------------------- > >> - > >> To unsubscribe, send email to [EMAIL PROTECTED] > >> ---------------------------------------------------------------------------- > >> - > >> > >> > >> > >> > >> ----------------------------------------------------------------------------- > >> To unsubscribe, send email to [EMAIL PROTECTED] > >> ----------------------------------------------------------------------------- > >> > > > > > > ----------------------------------------------------------------------------- > > To unsubscribe, send email to [EMAIL PROTECTED] > > ----------------------------------------------------------------------------- > > > > > > > > > > > ----------------------------------------------------------------------------- > To unsubscribe, send email to [EMAIL PROTECTED] > ----------------------------------------------------------------------------- > > ----------------------------------------------------------------------------- To unsubscribe, send email to [EMAIL PROTECTED] -----------------------------------------------------------------------------
