ncap supplies for() loops and while() loops. They are completely unoptimized so use them only with RAM variables unless you want thrash your disk to death. To break out of a loop use the break command. To iterate to the next cycle use the continue command.
// Follwing sets elements in variable double temp(time,lat) // If element < 0 set to 0, if element > 100 set to 100 *sz_idx=$time.size; *sz_jdx=$lat.size; for(*idx=0;idx<sz_idx;idx++) for(*jdx=0;jdx<sz_jdx;jdx++) if(temp(idx,jdx) > 100) temp(idx,jdx)=100.0; else if(temp(idx,jdx) < 0) temp(idx,jdx)=0.0; // Are values of co-ordinate variable double lat(lat) monotonic? *sz=$lat.size; for(*idx=1;idx<sz;idx++) if(lat(idx)-lat(idx-1) < 0.0) break; if(idx == sz) print("lat co-ordinate is monotonic\n"); else print("lat co-ordinate is NOT monotonic\n"); // Sum odd elements *idx=0; *sz=$lat_nw.size; *sum=0.0; while(idx<sz){ if(lat(idx)%2) sum+=lat(idx); idx++; } ram_write(sum); print("Total of odd elements ");print(sum);print("\n");