[kepler-dev] Fwd: [Kepler - Bug #6439] (New) Double rounding fails in some cases while evaluating Expressions

[Matt Jones]

Daniel and Christopher --

Do either of you have any insight into this new rounding issue?  Can you
confirm whether or not this is new behavior?

Matt

---------- Forwarded message ----------
From: <noreply at nceas.ucsb.edu>
Date: Tue, Mar 4, 2014 at 3:24 AM
Subject: [Kepler - Bug #6439] (New) Double rounding fails in some cases
while evaluating Expressions
To:


 Issue #6439 has been reported by Owsiak Michal.
------------------------------
Bug #6439: Double rounding fails in some cases while evaluating
Expressions<https://projects.ecoinformatics.org/ecoinfo/issues/6439>

   - Author: Owsiak Michal
   - Status: New
   - Priority: Urgent
   - Assignee: Derik Barseghian
   - Category: actors
   - Target version: 2.3.0
   - Bugzilla-Id:

It seems that addition of doubles can produce values slightly different
than they should to be.

Please take a look at attached workflow (simple_error.xml).

Condition that should be satisfied to escape the loop is: 1.7 > 1.5 + 0.1

However, loop is interrupted sooner, because of incorrect calculation of
doubles. Value of "p" is set to: 1.6000000000000003

This, of course, makes it impossible to use doubles as check points for the
loops.

However, it seems that casting to string and back works fine (take a look
at second workflow - simple.xml)

Cheers

Michal
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