Re: negative value for a db

i put this in my default and now i am getting .74 for a -74

John

Chris Adams wrote:
> Once upon a time, John Hutchinson <[email protected]> said:
>   
>> I am trying to monitor a radio that returns a db reading in a negative 
>> number can someone help me in how to tell cricket collector to multiply 
>> the number by -1 before  passing it to rrd so that it can be shown on 
>> the graph?
>>     
>
> You can't really modify the number before it is stored, but you can
> modify it before graphing.  For the datasource, you should have an entry
> in the graph dictionary, and you can specify operations there like:
>
> graph	RSSIfrAP
> 	scale	= -1,*
>
> The "scale" entry is an RPN operation to apply to the data before
> graphing.
>
> If you really want to have a modified value stored, I think the only way
> currently to do that is to store the unmodified value and then make a
> COMPUTE datasource that does the modification (but that's overly
> complicated for what you are doing).
>
>   


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