How do I use a variable in dialog box?

I am working on DFIG wind turbine now, and I want to control the output power.

Given enough wind speed, whatever we type in the "nominal output mechanical power" becomes the output.

However, I want the wind turbine to just output the necessary power, so I want to use a variable Pref.

Do you know how can I make this work?

I have attached a jpeg file for more info.

Thanks!

Answer 1

[Walter Roberson]

field_as_string = get(handles.TheFieldName, 'String');
if strcmpi(field_as_string, 'pref')
  ....
else
  desired_output = str2double(field_as_string);
  ...
end

[Prinsis Garcee]

Walter Roberson, thank you very much.

How do I run this along with the model simulation? I have a feedback loop, so the value of Pref depends on the result of the simulation.

(confused)