Hi Brains trust,
Is there a way to delete points by a ID % . I can already delete by a % with $PT as there's $NPT to give you the total. I can delete based on a id number ie

$ID <= 3000

I just thought there might be something more elegant

Any ideas

rob

You could do something like rand(@id) > 0.5. Maybe not the most controllable, but should get you roughly a correct percentage.

Thanks ….

in a attribute wrangle running on points you can use:

int modulus = 5;
if (@id %modulus==0 )

{

removepoint( geoself(), @ptnum );

}

the code above is tested

I am going to test that as soon as I get to work !

Rob

my example above would remove 20% of points
using a modulus is fine if you want to remove a simple amount ie half %2, a third %3 ect

I had another go and realised that to use a percentage instead you could use the following snippet:

int percentage = 75;
if ( @id % 100 < percentage )

{

removepoint( geoself(), @ptnum );

}

Very cool and going straight into my online notebook

Rob

No problem

is your notebook public? I wouldn't mind having a look if so

do you have a link?

cheers

PM sent

Rob