Modifies a tracing model element.
(tpm_traceelemedit trace_id elem_id new_val)
Returns T or nil.
| trace_id | Model ID (returned by tpm_tracealloc) |
| elem_id | Element ID (real) |
| new_val | List consisting of a code for the property to modify and a new value for the property. See Properties and Values below. |
| (40 . f_res) | Resistance of node (real), or forward resistance of link |
| (41 . r_res) | Reverse resistance of link (real) |
| (70 . dir) | Link direction (integer): -1 Reverse 0 Bidirectional 1 Forward |