Now you can take comparisons too far and then they won't be useful anymore. If you want I will explain the setup here and you will see.
RBS > 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] > ----------------------------------------------------------------------------- > > > ----------------------------------------------------------------------------- To unsubscribe, send email to [EMAIL PROTECTED] -----------------------------------------------------------------------------
