/usr/share/psychtoolbox-3/PsychOneliners/GetEchoNumber.m is in psychtoolbox-3-common 3.0.9+svn2579.dfsg1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | function number = GetEchoNumber(window,msg,x,y,textColor,bgColor,varargin)
% number = GetEchoNumber(window,msg,x,y,textColor,bgColor, [untilTime=inf], [KbCheck args...])
%
% Get a number typed at the keyboard. Entry is terminated by
% <return> or <enter>. Typed characters are displayed on the screen.
% Useful for i/o in a Screen window. Equivalent to
% "number=str2num(GetEchoString(...))".
%
% Returns the empty matrix if no number is entered. Returns a
% column vector with multiple numbers if more than one number
% is entered.
%
% See also: GetNumber, GetString, GetEchoString
%
% 2/4/97 dhb Wrote it.
% 3/15/97 dgp Replaced sscanf by str2num, which copes better with nonnumeric input,
% returning an empty matrix instead of a null string.
% 3/15/97 dgp Call GetEchoString instead of doing the work here.
% 3/18/97 dhb Got rid of obsolete 's' interface.
% 10/22/10 mk Switch to use of KbGetChar for keyboard input.
string = GetEchoString(window,msg,x,y,textColor,bgColor,1,varargin{:});
number = str2num(string); %#ok<ST2NM>
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