function y = approx(x, n)
% APPROX  Round the number to 1+n significant digits.
%   y = APPROX(x) shorthand for round(x, 4, 'significant').
%   y = APPROX(x, n) shorthand for round(x, 1 + n, 'significant').

%   Copyright 2016 Pyry Jahkola

if nargin < 2
    n = 3;
end

m = floor(log10(abs(x)));
unit = 10 .^ (max(m) - n);
y = bsxfun(@times, round(bsxfun(@rdivide, x, unit)), unit);