The SUM() function in libreoffice calc treats small numbers (small enough to be displayed in exponential notation) as zero.
Steps to reproduce:
In cell A1, enter: -4.0E-4
In cell A2, enter: 0.01
In cell A3: =SUM(A1:A2)
In cell A4: =A1+A2
In A4, you will see the correct result, but in cell A3, you'll just see a copy of the result in cell A2. Sum should parse numbers in the same way as other equivalent arithmetic operations.
My understanding is that libreoffice, based on java, is supposed to follow the IEEE 754 standard.
Scala and python, on the same standard, properly parse the -4E-4 number:
scala> -4.0E-4 + 0.01
res61: Double = 0.009600000000000001
>>> -4.0E-4 + 0.01
If I use the SUM() function in excel it also gives me the correct result.
The exponential value is ignored, in cell A3 we see the value in cell A2.
A3 should contain the value 0.0096, as in A4.
Operating System: Ubuntu
Version: 184.108.40.206 release
Works for me.
Check if A1 is a number with =ISNUMBER(A1) or with Ctrl+F8 (A1 should be blue).
Created attachment 78196 [details]
demonstrate bug with "sum" vs +
Maybe you're using a different version or OS?
I've attached a screen shot. Even if the value was not numeric, sum should treat it the same was "+" treats it. I get different results when using "sum" vs "+".
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This NEW Message was generated on: 2015-03-03
Not reproducible with Libreoffice 18.104.22.168.0+ built at home under Ubuntu 14.10 x86-64.
Closing as WorksForMe. Please, feel free to reopen if you encounter the described behavior with one of the current stable versions or with the master.
Best regards. JBF