At 15:36 03/01/2016 -0500, Rémy Gauthier wrote:
I am using CALC in LO 5.0.3.2 on a Fedora 23
(formally 22) system. The version of LO I use is
a version I downloaded from the LO site, not the
version that installs with Fedora. I had to
implement something in CALC that looked more or less like this:
F(X) = (X+5)*6 + (((25+(X+5)*6-6) MOD 14)
If X is equal to 25, the result is 183. If I
place this formula in a cell (where cell A2
contains 25): =(A2+5)*6+MOD(25+(A2+5)*6-6;14),
CALC indeed provides 183 as the answer. However,
the following thing happens when I try to use
the CURRENT() function in that calculation:
=(A2+5)*6+MOD(25+CURRENT()-6;14): The result provided is 182
=(A2+5)*6+MOD(25-6+CURRENT();14): The result provided is 190
=(A2+5)*6+MOD(CURRENT()+25-6;14): The result provided is 183
=(A2+5)*6+MOD(-6+CURRENT()+25;14): The result provided is 193
It is my understanding that the CURRENT()
function returns the current value of the
formula being calculated. In the examples above,
because the call to CURRENT() is inside the
MOD(), the value of the formula at that point
should be the same (180=(25+5)*6 in my example)
regardless of where CURRENT() is placed since
the MOD cannot be calculated before the two
arguments are evaluated. Is there something I am missing?
I suspect this is "by design". The problem, I
think, is that there is no unique meaning to "the
current value of the formula being calculated" in
any but the simplest of cases. If your formula is
evaluated from left to right, the first part will
indeed have been determined as 180. But then this
result will have been held in suspension whilst
the value of the MOD() function reference - and
in particular of its first argument - is
calculated. In your first example, for instance,
when CURRENT() is encountered, there will be two
current values, neither of which can be described
as the value of the formula, namely the 180 and
now 25 as part of the new calculation. CURRENT()
clearly uses this new value - the value of the
sub-expression currently being evaluated - and not the value in suspension.
In the third example, there is no value yet for
the new sub-expression, and CURRENT() defaults to
the existing value of 180. I think you like this,
but I'm not sure it's helpful. You might be amused by examining the effect of
=MOD(CURRENT()+25-6;14)
or just
=CURRENT()
I suspect you need either not to worry about the
extra calculation done if you repeat (A2+5)*6
explicitly within your formula or else to
calculate it separately in a cell and then use a
reference to that cell twice in your formula.
Remember that the necessary cell can be in a
hidden column or row or outside the print range
or on another sheet, as preferred. CURRENT() is meant for other purposes.
I trust this helps.
Brian Barker
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