[samigo-team] Floating point numbers

[Karen Tsao]

Thanks for everyone's input.

Sam,

Could you please make the change? Thanks!

Karen

On Thu, Feb 28, 2013 at 6:19 AM, David Horwitz <david.horwitz at uct.ac.za>wrote:

>  There's a another issue (fixable without replacing floats but still)
>
> There are several places in the code where direct foat comparisons are
> made:
>
> Float a =
> Float b,
>
> if (a.equals(b))
>
> For instance to check if an answer has been updated etc. We could be
> getting extra updated because of slight differences in the float
> representation ...
>
> D
>
>
> On Thu, 2013-02-28 at 09:11 -0500, Sam Ottenhoff wrote:
>
>
>  But just curious, what is the advantage of this change? Is this for
> getting a more precise score? Like some 0.999 issue?
>
>
>
>  An instructor created a complex placement exam that used point scores in
> the millions, thousands, hundreds, etc. as a way of being able to quickly
> see points in various sections in the final score (example: 27005508.06
> could be broken up to see that the student scores 06 on sec 1, 08, on sec
> 2, 55 on sec 3, 27 on sec 4).
>
>
>
>  So the reason why floating point numbers aren't used for money:
>
>
>
>  > create table floattest (z float);
>
> > insert into floattest VALUES (*2075808*);
>
> > select * from floattest;
>
>
>
>  The result: *2075810*
>
>  _______________________________________________
> samigo-team mailing listsamigo-team at collab.sakaiproject.orghttp://collab.sakaiproject.org/mailman/listinfo/samigo-team
>
>
> ------------------------------
> UNIVERSITY OF CAPE TOWN
>
> This e-mail is subject to the UCT ICT policies and e-mail disclaimer
> published on our website at
> http://www.uct.ac.za/about/policies/emaildisclaimer/ or obtainable from +27
> 21 650 9111. This e-mail is intended only for the person(s) to whom it is
> addressed. If the e-mail has reached you in error, please notify the
> author. If you are not the intended recipient of the e-mail you may not
> use, disclose, copy, redirect or print the content. If this e-mail is not
> related to the business of UCT it is sent by the sender in the sender's
> individual capacity.
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://collab.sakaiproject.org/pipermail/samigo-team/attachments/20130228/5e918819/attachment.html