2001 JI Open Discussion Posted August 14, 2006 Share Posted August 14, 2006 By: Bernd Proissl - berndproissl precise calculations 2002-05-27 05:48I am evaluating JR and wonder how one can do precise calculations: in class JRCalculator there is. case JRVariable.CALCULATION_SUM : { ... newValue = new Double(value.doubleValue() + newValue.doubleValue());// FIXME work with double ... So two Doubles are added here which will produce rounding errors. Is there a way to have JR sum up something like java.math.BigDecimal? Do I have to hack the code to get this done? Bernd By: Teodor Danciu - teodord RE: precise calculations 2002-05-27 06:37 Hi, You don't have to hack the code. :) Instead, you could propose a patch and I'll take care of integrating it into the main version. Now that you mentioned BigDecimal, I'll see what we could do about it. Thank you, Teodor By: Bernd Proissl - berndproissl RE: precise calculations 2002-05-27 06:52Thanks for your fast answer! "Instead, you could propose a patch and I'll take care of integrating it into the main version. " for me is the same as hacking the code ;) Do you have a suggestion of how to make the patch? - is compatibility necessary (we are still ways from 1.0 ;) ) or can I replace the Double stuff with BigDecimal? - should I introduce something like CALCULATION_SUM_PRECISE and leave CALCULATION_SUM untouched? is there CVS access? Thanks Bernd By: Teodor Danciu - teodord RE2: precise calculations 2002-05-27 07:12 Hi, I have another idea. We can add a flag at variable level (isPrecisionRequired) to indicate that for the specified calculations we need maximum precision, so the engine should use BigDecimal. By default, this flag would be "false", for performance reasons. In addition to this, we have to allow the creation of java.math.BigDecimal data source fields. I'll dig into this and come up with a solution maybe for the 0.3.2 version which I'm preparing right now. Thank you, Teodor By: Bernd Proissl - berndproissl RE3: precise calculations 2002-05-27 07:27let me know if you need someone for testing. Bernd By: Bernd Proissl - berndproissl RE4: precise calculations 2002-05-27 22:45FYI http://developer.java.sun.com/developer/bugParade/bugs/4018937.html By: Bernd Proissl - berndproissl RE5: precise calculations 2002-06-03 07:24Teodor, > I'll dig into this and come up with a solution maybe > for the 0.3.2 version which I'm preparing right now. can you give as your expected time frame for 0.3.2 and if BigDecimal functionality will be included :) Bernd By: Teodor Danciu - teodord RE: RE5: precise calculations 2002-06-03 08:16 Hi, I have already introduced calculations with BigDecimal in the main version. I just wanted to add also hyperlinks and delayed the release of 0.3.2. It will be available before the end of this week. Thank you, Teodor Link to comment Share on other sites More sharing options...

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