# [mrtg] Re: Can you Multiply "In" but not "Out" values?

Koelstra, J. (Jan) JKoelstra at MINSZW.NL
Mon May 2 15:15:49 MEST 2005

```Todd,

In theory you can combine both oid's in a mathemetical expression which will give the desired result. To get this you need to find 4 oid's that give constant values:
oid A, should allways return the value 1.8
oid B, should allways return the value 1
oid C, should allways return the value 32
oid D, should allways return the value 0

With these you can put the following mathemetical expression into your targetline:
"oid for temperature"&"oid for humidity" * "oid A"&"oid B" + "oid C"&"oid D"

If you can't find the 4 oid's with the needed values you have to use an external script.

HTH,

Jan.

-----Original Message-----
From: mrtg-bounce at list.ee.ethz.ch [mailto:mrtg-bounce at list.ee.ethz.ch] On Behalf Of TSimons at Delphi-Tech.com
Sent: Monday, May 02, 2005 2:53 PM
To: mrtg at list.ee.ethz.ch
Subject: [mrtg] Can you Multiply "In" but not "Out" values?

<resending with a different subject>
Sent: Thursday, April 21, 2005 2:03 PM
Subject: [mrtg] Math Functions

Hello All

I'm monitoring Temperature and Humidity from an APC Device with the following Target:

Target[APCEMU1_Probe1]: .1.3.6.1.4.1.318.1.1.2.1.1.0&.1.3.6.1.4.1.318.1.1.2.1.2.0:dti at 10.192.1.191

.1.3.6.1.4.1.318.1.1.2.1.1.0 is temperature in Celsius .1.3.6.1.4.1.318.1.1.2.1.2.0 is humidity in %

Is there anyway I can incorporate the function for Celsius to Fahrenheit (* 1.8 + 32) into the temperature and not humidity?

I can convert it if I use Temp for In/Out, but I'd like a combined graph.

Thanks,
~Todd

__________________________________
Todd M. Simons
Senior MIS Engineer
Dell Tier 1 PA Technician
Delphi Technology, Inc.
New Brunswick, NJ

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