Changes between Version 139 and Version 140 of WikiStart

Timestamp:

02/28/19 13:46:20 (5 years ago)

Author:

wouter

Comment:

--

WikiStart

@@ -198 +198 @@
 }}}
 |----------------------------
-=== Value representation in Json 
+
+
+== Bids ==
+A Bid is a map with the issue names as keys (strings) and the values being an element from the valueset as in the domain description.
+
+A bid typically looks like 
+{{{
+{ "salary":"2000", "fte":"0.8", "work from home","0.6" ...}
+}}}
+
+This example also illustrates a problem with the json parser. In our jobs example domain, all issues have discrete values, so "2000" is just a string, not a number. 
+
+In this case, a specific problem occured that we had to figure a workaround for. Suppose we have a bid in the jobs domain: 
+
+
 
 Internally BigDecimal is used for computing and storing issue values, utilities etc. Doubles always give rounding problems and can not be assumed to sum properly to 1 and therefore can not be used.
+
+In the special case of issue values, we can not determine a priori if the values are 
 
 Since JSON parses normal number directly into doubles, it is necessary to place numbers also inside string objects ("..."). That in turn forces us to put some hard marker in the string to see if "1" would be a discrete value or number value. To do this, any Value contained in a string that is of the form "=X.Y" where X is a positive or negative integer and Y a positive integer is a NumberValue. Anything else is interpreted as a DiscreteValue.