use of function in if statement

Question

ET1994 2018-11-14

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编辑： Cris LaPierre 2018-11-14

在 MATLAB Online 中打开

Hi everybody,

Trying to create a program for basic calculation involving if statement and function.

Below having error;

Can someone suggest an idea please.

input = str2num(get(hObject,'StrTing'));
%checks to see if input is empty. if so, default input1_editText to zero 
if (isempty(input))     
  set(hObject,'String','0')
otherwise
  function childbirth = nb(x1);
    cover = input('Enter the cover plan: ');
    if cover == 1
      % if condition is true then the reimbursement will be 40 percent of the
      % amount entered for the bill in x1
      childbirth = x1 .* (40/100);
    elseif (cover == 2)
      childbirth = x1 .* (60/100);
    elseif cover == 3
      childbirth = x1 .* (80/100);
    else
      disp('The number entered is wrong, please verify!')
    end
  end
end 
guidata(hObject, handles); 

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Nick 2018-11-14

It would be nice to mention the exact error message.

From the first look its not in a switch statement so otherwise has to be replaced by else. Also calling a function does not require the function part, thats only needed for the function definition which you could do at the end of your function file or in a seperate function file

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Answer 1

Cris LaPierre 2018-11-14

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https://ww2.mathworks.cn/matlabcentral/answers/429856-use-of-function-in-if-statement#answer_346943

编辑：Cris LaPierre 2018-11-14

It not clear to me what you are trying to do. Does the funciton nb already exist or are you trying to define it in the if statement?

MATLAB supports functions defined in a script, but they must be placed at the very bottom of the script. You can then call it in the if statement by its name

input = str2num(get(hObject,'StrTing'));
...
if (isempty(input))     
...
else
    childbirth = nb(x1);
...
%% in-file functions
function out = nb(x1);
    ...
end

There are other issues that would need to be fixed in your code as well.

otherwise can only be used with a switch statement. Use "else" in an if statement
Is this code coming from a gui in Guide? If so, then discount my example. You can still declare a function in a GUI, but it is done differently.

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Answer 2

dpb 2018-11-14

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在 MATLAB Online 中打开

First and foremost, to place a function in a script or other function as local, it must be outside a logic construct...you then refer to it in the normal ML syntax manner:

input = str2num(get(hObject,'StrTing'));
%checks to see if input is empty. if so, default input1_editText to zero 
if (isempty(input))     
  set(hObject,'String','0')
else
  set(hObject,'String',str2num(childbirth(nb(x1))))
end 
guidata(hObject, handles); 
...
    
function childbirth = nb(x1);
    cover = input('Enter the cover plan: ');
    if cover == 1
      % if condition is true then the reimbursement will be 40 percent of the
      % amount entered for the bill in x1
      childbirth = x1 .* (40/100);
    elseif (cover == 2)
      childbirth = x1 .* (60/100);
    elseif cover == 3
      childbirth = x1 .* (80/100);
    else
      disp('The number entered is wrong, please verify!')
    end
end