Trying to understand work of InputField in Manipulate. My example code is:

PlotRange -> {{Automatic, max}, Automatic}], 
Control[{{list, "Range[10]", "List"}, 
InputField[#, String] &}], {{max, 10, "Max range"}, InputField}]

So, I have some list (here just Range[10] for simplicity), which can be entered by user in corresponding InputField and I want to control plotting range (max variable here). Now if I change Range[...] the plot range doesn't change, I suppose max should somehow become equal to Max@ToExpression@list. How to organize this?



1 Answer 1


As I understand the question, the OP would like the user to be able to control the upper limit of the horizontal axis; and would like max to be set to the maximum range whenever list is changed, after which the user can change max as desired. In that case, a typical approach is to use TrackingFunction to set the other variables. I thought it would be more efficient to have another hidden variable (no control) to be the actual list, since its value is needed in a couple of places.

 ListPlot[list, PlotRange -> {{Automatic, max}, Automatic}],
 Control[{{str, "Range[10]", "List"},
   InputField[#, String] &,
   TrackingFunction -> (
     (str = #;
       list = ToExpression[str];
       (* Optional: add check here, set flag if not a List *)
       max = Length[list]) &)}],
 {{max, 10, "Max range"}, InputField},
 {{list, Range[10]}, ControlType -> None}
  • $\begingroup$ Yes, this is exactly what I need, many thanks Michael! $\endgroup$
    – Alx
    Commented Jul 8, 2019 at 1:36
  • $\begingroup$ @Sam_1q You're welcome! $\endgroup$
    – Michael E2
    Commented Jul 8, 2019 at 3:19

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