GetXRanges (X, Y, ranges)

%Ynew = GetXRanges (X, Y, ranges)
%
%GetXRanges will select certain ranges of a spectral datamatrix.
%
%Input parameters:
%    X: the values of the X-axis
%    Y: the datamatrix of the spectra (1 row is 1 spectrum)
%    ranges: 2-column vector, first column defines the lower bond of the
%        ranges to select, while the second column defines the upper bond
%
%Output parameters:
%    Ynew: The spectra with the selected ranges
%
%Example:
%X=1:2:200;
%Y=rand(100);
%ranges = [12:20 40:75];
%Ynew = GetXranges (X,Y,ranges);
%%---> columns 6 till 10 and 20 to 37 are selected.
%

%The Biodata toolbox for MATLAB: a spectral database system for storing and
%processing spectra
%C 2005-2008, Kris De Gussem, Raman Spectroscopy Research Group, Department
%of analytical chemistry, Ghent University
%C 2009 Kris De Gussem
%
%This file is part of Biodata.
%
%Biodata is free software: you can redistribute it and/or modify
%it under the terms of the GNU General Public License as published by
%the Free Software Foundation, either version 3 of the License, or
%(at your option) any later version.
%
%Biodata is distributed in the hope that it will be useful,
%but WITHOUT ANY WARRANTY; without even the implied warranty of
%MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
%GNU General Public License for more details.
%
%You should have received a copy of the GNU General Public License
%along with Biodata.  If not, see <http://www.gnu.org/licenses/>.

%Copyright (c) 2005-2009, Kris De Gussem
%All rights reserved.
%
%Redistribution and use in source and binary forms, with or without 
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%
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function Ynew = GetXRanges (X, Y, ranges)
ind = [];
for i=1:size (ranges,1)
    v = (X >= ranges (i,1))&&(X <= ranges (i,2));
    ind2 = find (v);
    ind = [ind ind2]; %#ok<AGROW>
end
Ynew = Y(:,ind);