How to prompt for input using an existing variable in the prompt

Question

I'm trying to ask the user for a value of some variable, but at the same time, showing him the last value used (at the termination of the program, the values are saved to a file, and loaded at the start of the program).

Something like this:

Enter new radius value (R=12.6) :
... user enters 12.7 ...
Enter new pi value (pi=3.14) :
Enter new height value (h=30.0) :

Usually I would write the first one with write statement, then read the new one (in Fortran, for example). In MATLAB however, I don't know how to write something out with input statement. Are there some other statements for getting input ?

@MatlabDoug - MATLAB is okey, my mistake there, but fortran is no longer an acronym, but a name, and it is written in lowercase. — Rook
– Rook, Commented May 11, 2010 at 1:19
@Idigas So it is: en.wikipedia.org/wiki/Fortran#cite_note-0 Guess that shows that when I last used Fortran it was FORTRAN 77! :) — MatlabDoug
– MatlabDoug, Commented May 11, 2010 at 13:44

Jonas · Accepted Answer · 2010-05-08 13:21:38Z

5

You can use the command input for this, combined with sprintf.

%# set defaults
radius = 12.6;

%# ask for inputs
tmp = input(sprintf('Enter new radius value (R=%4.2f)\n',radius));
%# if the user hits 'return' without writing anything, tmp is empty and the default is used
if ~isempty(tmp)
    radius = tmp;
end

As an alternative, you may want to look into INPUTDLG

answered May 8, 2010 at 13:21

Jonas

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