num2mass.m

航天工程工具箱

function str=num2mass(m,tab)
%NUM2MASS  Displays mass in SI-units.
%   STR = NUM2MASS(M,TAB) returns a string containing
%   the value of the mass M (in kg) normalized in a proper power
%   of grams, kilograms or tons. Argument TAB can be entered
%   in order to align the prefix character on a distance of
%   at least TAB number of spaces from the last character in
%   the normalized value.
%   Ex:
%
%     num2mass(.21)   gives: '210 g'
%     num2mass(.21,4) gives: '210 g'
%     num2mass(.21,5) gives: '210  g'
%     num2mass(12)    gives: '12 kg'
%     num2mass(.0003) gives: '300 mg'
%     num2mass(25054) gives: '25.054 ton'
%
%   See also NUM2STR, SEC2HMS.

% Copyright (c) 2002-02-09, B. Rasmus Anthin.

if ~isnan(m) & m
   e=floor(log10(abs(m*(1+5*3*eps))));
   e=e-mod(e,3);
else
   e=0;
end
if e<3
   [s,p]=num2sci(m*1000);
   if nargin==2
      str=[s blanks(tab-length(s)-1) ' ' p 'g'];
   else
      str=[s ' ' p 'g'];
   end
else
   [s,p]=num2sci(m/1000);
   if nargin==2
      str=[s blanks(tab-length(s)-1) ' ' p 'ton'];
   else
      str=[s ' ' p 'ton'];
   end
end