using inputdlg function in user defined function

Hello

I would like to write this code in matlab function in simulink file

function y = fc()
    y=0;   
    coder.extrinsic('inputdlg');    
    prompt = {'Enter 1 for Yes 0 for NO'};
    dlgtitle = 'Input';
    dims = [1 35];
    answer = inputdlg(prompt,dlgtitle,dims)
end

when I run the simulation ,the diagloge box apear several time during simulation.

I would like to apear the box only one and keep on the simulation run

could help me to do this?

Another question

I need to add switch case like this

function y  = SW_case()
  y=0;
  coder.extrinsic('inputdlg');
  prompt = {'Enter 1 for Yes 0 for NO'};
  dlgtitle = 'Input';
  dims = [1 35];
  answer = inputdlg(prompt,dlgtitle,dims);
  switch answer{1}
    case 1
        y=100
    case 0
        y=10
end

when I run the simulation

there is an error ocure

Cell contents reference from a non-cell array object.

Function 'MATLAB Function1' (#23.178.187), line 8, column 8:
"answer{1}"

thanks alot in advanced

[dpb]

I couldn't reproduce the specific error regarding the non-cell object; I got a cell array returned; would seem to need the case in context to reproduce. Then again, I don't have Simulink so I can't simulate calling the function that way.

However, your code isn't testing for the empty return nor that the values are acceptable and the result in the cell array will be a char() string, NOT a numeric value even if the user does "the right thing". This is a tough way to get the input and control what the user does --

...  
answer = inputdlg(prompt,dlgtitle,dims);
if isempty(answer)
  answer=1;         % the default answer???
else
  answer=str2double(answer{:});     % convert to number
  if isfinite(answer)               % could convert the string to a number
    if ismember(answer,[0 1])       % make sure either 0,1
    else
       answer=1;                    % default if not???
    end
  end
end
switch answer
  case 1
      ...

is a start but not even close to being fully robust to check alternatives --

I suggest something more like

yn = questdlg('Yes or No?','Input','Yes','No','Yes');
if matches(yn,'Yes')
  y=100;
else
  y=10;
end

at least controls the possible return values to something you know is one of the two possible button answers although there is also again the possibility the user closes the dialog without selecting either in which case the return is the empty char() vector...the above ignores that possibility and lumps it in with a 'No'

You'll have to decide how to handle all the possibilities but I'd definitely stay away from freeform user input here...they could type in Hamlet's soliloguy in the box for you to parse above -- not that that's likely, but there's no way to limit just typing errors...

[MAB]

Thanks alot dpb for response

I upload the model (it is a simple example for what I need )

I used the questdlg function and switch case

still error

An error occurred while running the simulation and the simulation was terminated

Caused by:

Undefined function 'check_switch_expression' for input arguments of type 'char'.

if I used num2str function

function y  = SW_case1()
coder.extrinsic('questdlg')
coder.extrinsic('str2num')
answer = questdlg('Would you like a dessert?', ...
    'Dessert Menu', ...
    '1','2','0','0');
a=str2num(answer)
switch a
    case 1
        y=1.75
    case 2
        y=3
    case 'No thank you'
        y=3.5
    otherwise
        y=3.5+(0.5)
end

still error

An error occurred while running the simulation and the simulation was terminated

Caused by:

Undefined function 'check_switch_expression' for input arguments of type 'double'.

Answer 1

[Walter Roberson]

"I would like to apear the box only one and keep on the simulation run"

That is not possible with inputdlg()

See https://www.mathworks.com/help/simulink/control-and-visualize-simulations-with-interactive-displays.html

[MAB]

Thanks alot Walter Roberson for response

I change the inputdlg function to questdlg function

I upload the model

still error

An error occurred while running the simulation and the simulation was terminated

Caused by:

Undefined function 'check_switch_expression' for input arguments of type 'char'.

[Walter Roberson]

Tested.

However, this does not leave the prompt box up the way you had hoped for. Also it asks for the value every time step...

function y  = SW_case1()
coder.extrinsic('questdlg')
answer = '';
coder.varsize('answer', [1 20], [0 1]);

answer = questdlg('Would you like a dessert?', ...
	'Dessert Menu', ...
	'Ice cream','Cake','No thank you','Cake');
switch answer
    case 'Ice cream'
        y=1.75
    case 'Cake'
       y=3
    case 'No thank you'
        y=3.5
    otherwise
       y=3.5+(0.5)
end

[MAB]

Thank you so much Walter Robertson

yes still opening the message every step time

is there any way to do that ? in simulation

I would like to appear a message at if condition is activate

and according to may choose the certain task is occurred

Answer 2

[Steven Lord]

Since you're doing this in a MATLAB Function block, rather than bringing up a dialog each time I'd consider using a Constant block or perhaps one of the Customizable Blocks to define an input to that block.

[MAB]

Thank you sir for helping me

This code is a part of my code I need to appear The message box after if condition activate and according to the choose of the message box ,the certain task is occurred

I don’t need a constant block or any input to a user defined function

Can I do it?