[rrd-users] CDEF,RPN, no decimal constant possible?
Peter
pspiegler at gmx.de
Thu Jul 10 18:59:37 CEST 2014
rrd use really the formula "DeLog_L,LOG,4,*"
The fractional part is lost.
I updated a smaller rrd with some 1000 and get with dump:
...
<row><v>1.0000000000e+003</v><v>2.7631021116e+001</v></row>
But it should be 30.
The real formula is L=10*LOG10(Delog_L).
Because there is no LOG10 I used 10/LOG(10)=4.342944819
So I changed the formula to LOG(Delog_L)*10/LOG(10):
DS:L:COMPUTE:DeLog_L,LOG,10,*,10,LOG,/
and get
<row><v>1.0000000000e+003</v><v>3.0000000000e+001</v></row>
It is a bug, that decimal numbers are round to integer numbers?
Peter
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