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.

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.