How do I prompt user to re-input value if first attempt is incorrect?

I am trying to prompt user to input a value for R^2, accepting or rejecting value within a range 0-1. If value is correct, proceed to next input question. If value is incorrect, display error message to user and re-prompt them to insert new value within range. Currently, I get the error but it does not allow me to re-enter a new value for that variable, it simply continues to next prompt. I need to create a loop of some kind but am not sure how?

prompt = inputdlg('Please enter an R^2 value for Cement:');
data = str2double(prompt);
if 0<= data && 1>=data
else
    errordlg('Input must be between the values 0-1.');
end

prompt = inputdlg('Please enter an R^2 value for Blast Furnace:');
data = str2double(prompt);
if 0<= data && 1>=data
else
    errordlg('Input must be between the values 0-1.');
    return
end

Answer 1

[Matt J]

Something like this, perhaps?

exit=false;
msg='Please enter an R^2 value for Cement: '

while ~exit

 data = str2double( inputdlg(msg) );
 
 exit = (0<= data && 1>=data);
 
 if ~exit
      msg = 'Input must be between the values 0-1. Please re-enter: ';
 end
 
end

[Lauren-Xante Claassen]

Hi Matt,

This seems to be displaying the error even when I enter in correct values?

[Lauren-Xante Claassen]

Thanks a million - it finally works!