I am trying to complete a while loop that uses letters instead of numbers as the accepted input. The accepted inputs are M,m,F,f. How do I prevent other inputs from getting through?

% (calculating the Ideal Body Weight (IBW))
ideal_body_weight_male_kg = 50.0 + (2.3 * (height_inches - 60));
ideal_body_weight_female_kg = 45.5 + (2.3 * (height_inches - 60));
% (input for gender function)
ideal_body_weight = input('Enter the gender (M/m or F/f): ', 's');
% (while loop to validate input)
while ideal_body_weight;

That is what I need help with. The following is an example of other while loops I have used in this program that work.

%( user inputs height in inches)
height_inches = input('Enter height in inches (59-78): ');
% (while loop to validate input)
while height_inches;
  if height_inches > 78
      height_inches = input('Enter height in inches (59-78): ');
  elseif height_inches < 59; 
      height_inches = input('Enter height in inches (59-78): ');
  else 
      break
  end
end

[Tom W]

You can also implement an Error Dialog in your loop (

errordlg)

Answer 1

[Azzi Abdelmalek]

EDIT

s=input('genre','s')
genre='FfMm'
while ismember(s(1),genre)   % s is the input

[Anna Bradley]

That's not the problem. That part actually works, I need to figure out how to have the M/m/F/f work.

[Azzi Abdelmalek]

Look at the Edit

[James]

I'm having a tough time understanding this. So for example

user_Gender = input( 'Is the person a female or male? Enter F or M: ', 's' );

while

[James]

user_Gender = input( 'Is the person a female or male? Enter F or M: ', 's' );
while user_Gender ~= 'M , m || F , f'
  user_Gender = input ( 'Is the person a female or male? Enter F or M: ', 's' );
end

[Azzi Abdelmalek]

user_Gender = input( 'Is the person a female or male? Enter F or M: ', 's' );
while ~ismember(user_Gender,{'M' ,'m','F' ,'f'})
  user_Gender = input ( 'Is the person a female or male? Enter F or M: ', 's' );
end