[mprasad]

Hi all,

I am looking at the extractData script for the simple harmonic motion tutorial.

Does anyone know how I can modify the script to extract centre of mass in 3 coordiantes?

Right now it only extracts for the z axis.

Thank you.

Regards,
Prasad

[wyldckat]

Greetings Prasad,

I assume you're referring to the tutorial "mesh/moveDynamicMesh/simpleHarmonicMotion".

Let's see...

1. The Allrun script provides the log file "log.moveDynamicMesh" to the script extractData.
2. The log file provides the centre of mass like this:
   

   Centre of mass: (0.5 0.5 0.5)

3. The script extractData gets the Z value with this line:
   

   grep "Centre of mass" $1 | cut -d ":" -f 2 | cut -d " " -f 4 | tr -d ")" > cM

4. cut is the application that does the extraction of the necessary data, along with tr. We can test and play with this, with the following command:
   

   echo "Centre of mass: (0.5 0.5 0.5)"  | cut -d ":" -f 2 | cut -d " " -f 4 | tr -d ")"

5. This seems to do the trick:
   

   echo "Centre of mass: (0.5 0.5 0.5)"  | cut -d ":" -f 2 | tr -d "()"

6. Therefore, change the line mentioned above in the script extractData to this:
   

   grep "Centre of mass" $1   | cut -d ":" -f 2 | tr -d "()" > cM

Best regards,
Bruno

[mprasad]

Greetings Bruno,

The script you suggested worked and i can extract the data in 3 coordinates now.

Thank you.

Regards,
Prasad