Hi
I have an attributewrangle:
if (@primnum < 15) {
concat(“@group_”, chs(“groupname”));
}
This doesn't work and produces no group.
How can i concatenate “@group_” with the user input chs(“groupname”) ?
Is it possible to build @group_groupname programatically?

-b

Remember, concat will return a result. You are discarding the result.

Try something like this…

// Primitive index.
int index = 1;

string result = concat(“group_”, chs(“group_name”));
addprimattrib(geoself(), result, index, “some_value_here”);


Note: if the attribute does not exist you use addprimattrib. if it does exist you use setprimattrib.

setprimattrib(geoself(), result, index, “some_value_here”,“set”);

Thanks. The problem with addprimattrib is that it doesn't add a group (at least not in the attributewrangle), it just add an attribute with the name “group_mygroup”
If i use the virtual variable @group_mygroup = 1; i get an attribute(group) with the name of group:mygroup listed in the spreadsheet.

-b

EDIT:
substituting the underscore with a colon makes it work:
int index = 1;

string result = concat(“group:”, chs(“groupname”));
addprimattrib(geoself(), result, index, “set”);
EDIT2:
I was wrong. Doesn't work with colon.

It is much simpler than that:

s@my_group = @group + “_” + chs(“groupname”);

no concat needed!

Thanks. I've tried that as well. @group is not a string so it errors with:
Call to undefined binary operator ‘string = float + string’
It's kind of un logical that @group_groupname is a float. I expected it would be an int.

I've also tried with:
s@my_group = “@group” + “_” + chs(“groupname”);
But that results in an attribute called my_group with the value set to “_bound_group_mygroup”
So it's not as easy as it seems.

-b

Not at my pc right now, but is there an itoa function to turn the float to a string?

Thanks.s@my_group = itoa(@group) + “_” + chs(“groupname”);
results in an attribute called “my_group” where the value is set to “0_mygroup” (from the chs())
I think i might have to rethink naming the group like this.

-b

If I'm understanding correctly, you could just use the Group Bindings parameter in the Bindings tab to set up a binding to a user-specified group name.

You could just add a fixed name attribute such as “my_group” to the spreadsheet. Then populate it with the number. At this point you could just use the standard Group node to fetch items based upon that value.

Type in Group name field.
@my_group==0

Thanks a lot! Big aha moment with the bindings tab.
- Added one groupbinding with “Group Name” set to `chs(“grpname”)` (the userfield)
- and VEX Parameter set to “group”
- Then in the code: @group = 1;
Thanks.

-b