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gnss-sdr/utils/matlab/libs/geoFunctions/roundn.m

52 lines
1.3 KiB
Matlab

function [x,msg] = roundn(x,n)
% ROUNDN Rounds input data at specified power of 10
%
% y = ROUNDN(x) rounds the input data x to the nearest hundredth.
%
% y = ROUNDN(x,n) rounds the input data x at the specified power
% of tens position. For example, n = -2 rounds the input data to
% the 10E-2 (hundredths) position.
%
% [y,msg] = ROUNDN(...) returns the text of any error condition
% encountered in the output variable msg.
%
% See also ROUND
% Written by: E. Byrns, E. Brown
% Revision: 1.9 Date: 2002/03/20 21:26:19
%
% GNSS-SDR is a Global Navigation Satellite System software-defined receiver.
% This file is part of GNSS-SDR.
%
% SPDX-FileCopyrightText: 1996-2002 Systems Planning and Analysis, Inc. and The MathWorks, Inc.
% SPDX-License-Identifier: GPL-3.0-or-later
msg = []; % Initialize output
if nargin == 0
error('Incorrect number of arguments')
elseif nargin == 1
n = -2;
end
% Test for scalar n
if max(size(n)) ~= 1
msg = 'Scalar accuracy required';
if nargout < 2; error(msg); end
return
elseif ~isreal(n)
warning('Imaginary part of complex N argument ignored')
n = real(n);
end
% Compute the exponential factors for rounding at specified
% power of 10. Ensure that n is an integer.
factors = 10 ^ (fix(-n));
% Set the significant digits for the input data
x = round(x * factors) / factors;