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

[Brendan McKay]

Hi Licheng,

geng -c 7 | pickg -Z2:4

You can use a range like that for all numerical parameters.  You can
also use -Z:4 for <=4 and -Z2: for >=2.

I'll answer your earlier question tomorrow.

Brendan.

On 28/9/2023 9:43 pm, lczhangmath wrote:
> 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
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