Hello Simon,
Not sure if I made myself clear.
I'm first using fetch to loop over the same data interval I would do for graph. 
Inside this loop, I will get the names of data sources that actually have the 
values I'm interested to see.
Out of the loop, I have all the data source names. I can then supply those 
names with the other parameter to generate the chart.
I can post part of the code if it makes easier to understand.
 

     Em Segunda-feira, 13 de Outubro de 2014 11:37, Simon Hobson 
<li...@thehobsons.co.uk> escreveu:
   
 

 Alceu R. de Freitas Jr. <glasswal...@yahoo.com.br> wrote:

> In most of cases, only part of those datasources will have interesting 
> results (~8% of datasources will have values near zero). I would like to 
> filter only the datasources that have a value greater than a threshold.

Fetch isn't a useful tool for this. Use graph, and PRINT (not GPRINT) to get 
the values you want (eg data source and max value). You can then use these in a 
script to dynamically generate a graph which only displays the data sources of 
interest.

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