[rrd-users] Re: Question on rrdtool graph PRINT function

[ciaran deignan]

Hi Didier,

I'm in the process of doing just about the same thing as toy ;)

The 0x0 is the size of the image generated!
rrdtool graph always displays the size of the image it generates, it
even says so in the man page:

NOTE on Return Values
Whenever *rrdgraph* gets called, it prints a line telling the size of 
the gif it has just created to STDOUT. This line looks like this: 
XSIZExYSIZE.

Have fun,
Ciaran

Didier wrote:

>Hello,
>
>     I'm studing the ability to display a table of global statistics (MIN,
>MAX, AVERAGE) of graphs displayed in Cacti (based on RRD) knowing a start
>and end.
>     Instead of graphing from LINE1, LINE2, LINE3    I'm intended to print
>on stdout MIN, MAX, AVERAGE.
>
>     I've found that I can use the  PRINT  function  of   rrdtool GRAPH
>as below
>     Therefore the work can be done more or less by replacing   GPRINT    by
>PRINT
>
>                 rrdtool graph test1_ds1_12.png --start 1091736000 --end
>1091740800 DEF:val1=test1_ds1_12.rrd:ds1:AVERAGE PRINT:val1:AVERAGE:%lf
>                 0x0
>                 6.126250    ======> it is the average
>
>                 rrdtool graph test1_ds1_12.png --start 1091736000 --end
>1091740800 DEF:val1=test1_ds1_12.rrd:ds1:AVERAGE PRINT:val1:MAX:%lf
>                 0x0
>                 9.990000   ======> it is the maximum
>
>
>
>
>
>      In the example above can anybody tell me what represent  0x  ;   I
>always get it.
>      How can I avoid it ?  Is there an error in the way I use the function
>above ?
>
>
>
>Thanks for your answer
>
>Didier
>
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