fb_unique_names()

[txt, OK]: fb_unique_names(o, n, supports)

• o the meclib object list (stackjson_parse(objects))
• n the names array (content of the names input field)
• supports list of indices of the supports and contacts whose reactions are compared

Source

fb_unique_names() checks that the reactions at the given supports all have different names. It compares the loads meclib matched to each support (n[i]), at different supports and at the same support. Other loads (weights, given forces) are not compared, they may legitimately share a name with something else.

Use it when the accepted names overlap, e.g. if both contacts of a body accept N (fb_contact(o, n, 1, "A: ", "static", ["N", "N_A"], ...) and the same for B). Each support check then passes on its own, and only fb_unique_names() notices that N is used twice.

Result:

• ["", true] if no name occurs twice,

• otherwise one line per repeated name, with the supports where it occurs, and false:

  Der Name (N) wird für mehrere Reaktionen verwendet (A, B). Reaktionen brauchen verschiedene Namen.
  The name (N) is used for more than one reaction (A, B). Reactions need different names.

Supports without a name (e.g. contacts with "" as label, since a label would sit right on the point) are not listed; if none of them has a name, the brackets are left out: Der Name (N) wird für mehrere Reaktionen verwendet. …

Supports without matched loads are skipped, so the function can run before the support checks.

Example

Feedback variables:

obj: stackjson_parse(objects);
[utxt, uOK]: fb_unique_names(obj, names, [1, 2]);
[atxt, aOK]: fb_contact(obj, names, 1, "A: ", "static", ["N", "N_A"], ["H", "H_A"]);
[btxt, bOK]: fb_contact(obj, names, 2, "B: ", "smooth", ["N", "N_B"]);
txt: castext_concat(utxt, castext_concat(atxt, btxt));
OK: uOK and aOK and bOK;

Node 1: AlgEquiv(OK, true), feedback {@txt@} in both branches.

See also Feedback for Free Body Diagrams, Feedback for "contact", Feedback for "fix12" (checks the two reactions of one support).