X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~yarrgweb/git?a=blobdiff_plain;f=yarrg%2Fweb%2Fdocs;h=8c48814f59faddfb74be9b4b1e6cec516b1f756c;hb=e85ef56a3b2eff647efc77e44ba5ba0a19e53393;hp=2abe504ecf7587e8c7899ad327ae98364670a4a3;hpb=2bc58b52308e6baee9d353b507861925815ec5be;p=ypp-sc-tools.db-test.git diff --git a/yarrg/web/docs b/yarrg/web/docs old mode 100644 new mode 100755 index 2abe504..8c48814 --- a/yarrg/web/docs +++ b/yarrg/web/docs @@ -33,16 +33,7 @@ %doc> -
-This website documentation page contains information about the -database website which you may not be able to divine from the online -user interface. +Hopefully you will be able to work it without too much help, but this +documentation page contains information about the database website +which you may not be able to divine from the online user interface. + +
+ +If this page is all too complicated for you, you may prefer to read +the introduction instead.
-(An exception to this is if you select the `Update' option from the -`Trades for route' lookup; the list of (de)selected stalls is too long +(An exception to this is if you select the "Update" option from the +"Trades for route" lookup; the list of (de)selected stalls is too long to fit in a URL.)
+
If you specify only one island or one archipelago, the site shows only arbitrage trades. If you want single-hop trades within an @@ -96,10 +92,10 @@ archipelago, you must enter the archipelago name twice.
After getting the results, you can untick various trades individually, -and select `Update' to get a new plan. The unticked trades will be +and select "Update" to get a new plan. The unticked trades will be excluded from the voyage plan (if any) and also from the totals. -
-So you should specify your vessel capacity. Currently you must -specify the actual mass and volume, as two numbers each with units. -The system understands the units t (tonnes), kg, l and kl -(kilolitres). There should be a space between the two limits, and no -space before the unit. +So you should specify your vessel capacity. You can enter things +like: +
-
+ capacity-string := [ first-term term* ] + term := ('+' | '-' | 'plus' | 'minus') (value+ | number'%') + value := mass | volume + | integer commodity-name-or-abbreviation + mass := number ('t' | 'kg') + volume := number ('kl' | 'l') + first-term := mass | volume | mass volume | volume mass + | ship-name-or-abbreviation ++ +If the first term specifies only one of mass or volume, all the +subsequent terms may only adjust that same value. + +
-Trades whose margin is less than the expected loss are never selected. -For example, if you select 1% loss per league, and plan a voyage of 5 -leagues, then any trade with a margin of less than 5.15% would be -completely excluded (5.15% not 5% because the loss works like compound -interest). Theoretically very profitable trades which are close to -the expected break-even point because of the distance can also be -rejected by the optimiser in favour of shorter distance trades with -theoretically smaller margins. +Trades whose margin is less than the expected loss are never included +in the suggested plan. For example, if you select 1% loss per league, +and plan a voyage of 5 leagues, then any trade with a margin of less +than 5.15% would be completely excluded (5.15% not 5% because the loss +works like compound interest). Theoretically very profitable trades +which are close to the expected break-even point because of the +distance can also be rejected by the optimiser in favour of shorter +distance trades with theoretically smaller margins, if it's not +possible to do both.
-As a guide: you may expect to lose between 0.1% and 1% per league. -0.1% would correspond, for example, to losing one fight to brigands -every ten 10-league voyages. +As a guide: you may expect to lose between 0.01% and 1% per league. +For example 0.1% would correspond to losing one fight to brigands (who +take 10% if they win) for every 100 leagues sailed.
You can enter the value in the box either as a percentage, or as a -fraction 1/divisor, eg 1/200 is the same as 0.5%. +fraction 1/divisor, eg 1/2000 is the same as 0.05%; in each +case it is taken as the loss for each league of the voyage. + +
+ +The trading plan does not take into account accumulated profits from +each leg of the journey when applying the available capital +constraint. For example, if you specify a journey from A to B to C +and a capital limit of 10000 PoE, the trading plan will not tell you +to buy 1000 peas at A for 10 PoE each, sail them to B and sell all of +them for 20 PoE each, and then buy 2000 beans at B for 10 PoE each and +sail them to C to sell for 20 PoE each even if such a trade would in +fact be possible. In practice this is unlikely to be a problem! + <& footer &>