MATLAB Instrument Driver for use with PicoScope 5000 Series oscilloscopes
normalise( x )
function [ xnorm ] = normalise( x )
%NORMALISE Normalise a vector.
% Normalise(X) normalises the vector X to the range -1 to +1.
%
% This function is meant to be used for a 1 x n array.
%
% Based on the normalization function provided by Steve Lord at
% <http://www.mathworks.co.uk/matlabcentral/newsreader/view_thread/162772>
% Find the minimum and maximum values
xmin = min(x(:));
xmax = max(x(:));
if(abs(xmax) >= abs(xmin))
maxamplitude = abs(xmax);
else
maxamplitude = abs(xmin);
end
if(xmin == xmax)
% Constant matrix -- I choose to warn and return a NaN matrix
warning('normalization:constantMatrix', 'Cannot normalise a constant matrix to the range [-1, 1].');
xnorm = nan(size(x));
else
xnorm = x / maxamplitude;
end
end
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Filename: normalise.m
%
% Copyright: Pico Technology Limited 2013
%
% Author: HSM
%
% Description:
% This is a MATLAB script that normalises a vector to the range -1 to +1.
% The function can be used to normalise an input signal for the arbitrary
% waveform generator.
%
% Ensure that the location of this file is in your MATLAB Path.
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%