state_time in a serie
of tunnels states.expand_state(x, ...)# S3 method for uneval_matrix
expand_state(x, state_pos, state_name, cycles, n = 1)
# S3 method for uneval_state_list
expand_state(x, state_name, cycles)
# S3 method for uneval_inflow
expand_state(x, ...)
# S3 method for uneval_init
expand_state(x, state_name, cycles)