## Assign gids to two different cell types

General issues of interest both for network and
individual cell parallelization.

Moderator: hines

Krishna Chaitanya
Posts: 70
Joined: Wed Jan 18, 2012 12:25 am
Location: University of Pavia

### Assign gids to two different cell types

Hi,

How to assign gids to two different cell types? Because, when I use for (i=pc.id; i<\$1;i+=pc.nhost), it cannot set same gid for two different cells.

Are there any examples available on this type of problem? In my case, two cell types exist: cell_1[3000], cell_2[102]

Kindly let me know.

Thank you.
ted
Posts: 5784
Joined: Wed May 18, 2005 4:50 pm
Location: Yale University School of Medicine
Contact:

### Re: Assign gids to two different cell types

Here's a simple strategy that should work if a single for loop is used to spawn all cells:

Decide in advance how many cells of each class are needed. Inside the for loop that spawns all cells, test the loop index i to determine which class should be created. Elaborating slightly, suppose there are M cell classes whose indices are m = 0..M-1, where the number of cells in any class m is n_m. Then the total number of cells is SUM over m=0..M-1 of n_m, and
class 0 cells have gids that range from 0 to n_0 - 1
class 1 cells have gids that range from n_0 to n_0 + n_1 - 1
class m cells, where 0<m<M, have gids that range from (SUM over j=0..m-1 of n_j) to (-1 + SUM over j=0..m of n_j)
Define the series of partial sums for j=0..M-1 to be
sum_0 = n_0 - 1
sum_1 = sum_0 + n_1
sum_j = sum_j-1 + n_j
sum_j is the maximum gid that will be assigned to a cell of class j.
So on each pass through the for loop, compare i against the partial sums to determine which class should be spawned. If the partial sums are contained in a Vector, the Vector class's indwhere will be useful for this.