here I adapt the inputfield for xL and xR but I would like to have tags for there on the left such as Lower Limit = "Inputfield" Upper Limit = .. Function = ... Result = FieldHint -> "Enter a string" does not work I think because I set the inputfields to a number. How can put these name tags?

Manipulate[
 Panel[DynamicModule[{f = Sin[x], xR = 1, xL = 0}, 
   Column[{InputField[Dynamic[xL]], InputField[Dynamic[xR]], 
     InputField[Dynamic[f]], 
     Dynamic[NumberForm[
       NIntegrate[f, {x, xL, xR}, WorkingPrecision -> nw], 
       np]]}]]], {{np, 10, "NumberFormat"}, 10, 30, 
  1}, {{nw, 16, "WorkingPrecision"}, 10, 30, 1}]

I believe there is at least for Enterprise CDF which I use but to be honest documentation is not as good as MATLAB.

That it really cool!

It got me thinking about whether you can enter arbitrary function which contain arbitrary parameters, like you could for example specify Sin[k x +m] or Sin[k^m * x].

The first problem that arose was that the expression entered was evaluated directly. Using input field, you can specify that the input should be an held expression.

Secondly when I wrote the parameter "o" into my expression ("o" being a parameter that was controlled by manipulate) the expression though I meant the "o" symbol from the global context, rather than the unique "o" created within the manipulate context. I fixed this by renaming the manipulated variable "oval" and since the expression was held, I could replace every instance of Global`o with the unique oval, before releasing the hold.

Manipulate[
 Dynamic[
  Plot[ReleaseHold[ReplaceAll[f, {o -> oval, p -> pval}]], {x, -5, 5}]
  ],
 {{oval, 1, "o"}, 1, 10},
 {{pval, 2, "p"}, 2, 10},
 {{f, Hold[Sin[o x + p]]}, InputField[Dynamic[f], Hold[Expression]] &}]

Cheers!

Hi!

You could add a button that when pressed, assigns the plot expression to a variable:

Manipulate[
 Column[{Button["Calculate", 
    plot = Plot[
      ReleaseHold[ReplaceAll[f, {o -> oval, p -> pval}]], {x, -5, 5}]],
   Dynamic[plot]}], {{oval, 1, "o"}, 1, 10}, {{pval, 2, "p"}, 2, 
  10}, {{f, Hold[Sin[o x + p]]}, 
  InputField[Dynamic[f], Hold[Expression]] &}, {{plot, 
   Plot[Sin[1 x + 2], {x, -5, 5}]}, None }
 ]

plot is a dynamic variable inside manipulate, but since I specified "None", it does not have a control associated with it.

I realized what causes the problem in your original code:

Manipulate[DynamicModule[{f = Sin[o x + p]}, 
Column[{InputField[Dynamic[f]], Dynamic[Plot[f, {x, -5, 5}]]}]], {o,1, 10}, { p, 2, 10}]

Since o and p are tracked by manipulate, any changes to them will reevaluate expressions inside of it. This includes the assignment f=Sin[o x +p] in DynamicModule. In fact, I think the whole dynamic module will be re-instanced.

Thanks for the reply. I can live with that to learn something but eventually I need more complex inputs. I am trying to develop apps for scientific calculations where I need to have a input field that the user can enter a function of his desire with desired values of the variables not limited sliders.