What does the ## represent when it is used as a function argument in e.g. Manipulate?

Asked Jun 23 '21 at 10:23

Active Jun 23 '21 at 14:12

Viewed 71 times

what does the ## represent in following expression:

Manipulate[Plot[Sin[a x],{x,0,4Pi}],
   {{a,1},0,4,AngularGauge[##,ImageSize->125]&},ControlPlacement->Left]

In this case, what is the arguments list the ## represent? Does ## represent the arguments list of Manipulate function and what is it? I understant when it is used in this case: f[##]&[a,b,c,d].

edited Jun 23 '21 at 14:12

asked Jun 23 '21 at 10:23

DieLianHua

2

## means SlotSequence. If you go to Menu/Help/WolframDocumentation and type there ## you get detailed information. – Alexei Boulbitch Jun 23 '21 at 10:48
It represents the list of arguments Manipulate passes on to the controller, which, in this case is defined as a custom AngularGauge function. This list of arguments is explained under the documentation of Manipulate > Details & Options: "The form {u, u_min, u_max, func} can also be used; what is evaluated is then func[Dynamic[u],{u_min, u_max}]." – István Zachar Jun 23 '21 at 10:55
2

Does this answer your question? What are the most common pitfalls awaiting new users? – Szabolcs Jun 23 '21 at 10:57
2

See https://mathematica.stackexchange.com/a/25616/12 in particular. – Szabolcs Jun 23 '21 at 10:57

What does the ## represent when it is used as a function argument in e.g. Manipulate?

0 Answers0