- Topo_Cart* res = new Topo_Cart(getComm(), newNDims, newDims, newPeriodic, 0, newcomm);
+
+ //split into several communicators
+ int color = 0;
+ for (int i = 0; i < oldNDims; i++) {
+ if (not remain_dims[i]) {
+ color = (color * dims_[i] + position_[i]);
+ }
+ }
+ Topo_Cart* res;
+ if (newNDims == 0){
+ res = new Topo_Cart(getComm(), newNDims, newDims, newPeriodic, 0, newcomm);
+ } else {
+ *newcomm = getComm()->split(color, getComm()->rank());
+ res = new Topo_Cart(getComm(), newNDims, newDims, newPeriodic, 0, nullptr);
+ res->setComm(*newcomm);
+ }