[Nauty] Filters graphs with diameters greater than 2 and less than 4

[lczhangmath]

Hello,


The second question in my email, titled "matching number and operations between parameters", contains this question, and I recount it in detail here.


As with equations, we sometimes need to filter for cases that satisfy a parametric inequality. For example, I 
would like to get all 7-vertex  graphs with diameter k where k is greater than or equal to 2 and less than or equal to 4.


At this time, either I use the external script (e.g. sagemath) or I run the following shell script, but the sctipt always repeats the execution of geng, so the efficiency is not high.


for i in {2..4}
do
    echo "Running geng 7 -c | pickg -V -Z$i"
    geng 7 -c | pickg -Z$i >> output.txt
done


 I don't know where I can change the source code to achieve this.




Best regards,
Licheng Zhang