function [freqAxis, freqLow, freqHigh] = genfreqaxis(carrierFreq, bandwidth, noFreq)%GENFREQAXIS Generates values for a frequency axis.%%--------%Synopsis:%  freqAxis = genfreqaxis(carrierFreq, bandwidth, noFreq)%  freqAxis = genfreqaxis(carrierFreq, {freqLowOffset, freqHighOffset},noFreq)%%  [freqAxis, freqLow, freqHigh] = genfreqaxis(carrierFreq, bandwidth, noFreq)%  [freqAxis, freqLow, freqHigh] = genfreqaxis(carrierFreq,%    {freqLowOffset, freqHighOffset},  noFreq)%%Description:%  Generates a vector with values for a frequency axis which can be used%  for example to when plotting a frequency spectrum created by "fft".%%Output and Input:%  freqAxis (RealVectorT): The generated vector with frequency values [Hz].%  freqLow (RealScalarT): The lowest frequency in the bandwidth [Hz].%  freqHigh (RealScalarT): The highest frequency in the bandwidth [Hz]. %    Note that this is not equal to the highest value in the vector%    "freqAxis".%  carrierFreq (RealScalarT): Carrier frequency [Hz]. This can be specified to%    zero for baseband signals.%  bandwidth (RealScalarT): Bandwidth [Hz].%  freqLowOffset (RealScalarT): Relative low frequency limit [Hz].%  freqHighOffset (RealScalarT): Relative high frequency limit [Hz].%  noFreq (IntScalarT): Number of frequency values to generate.%%--------%Notations:%  Data type names are shown in parentheses and they start with a capital%  letter and end with a capital T. Data type definitions can be found in [1]%  or by "help dbtdata".%  [D] = This parameter can be omitted and then a default value is used.%  When the [D]-input parameter is not the last used in the call, it must be%  given the value [], i.e. an empty matrix.%  ... = There can be more parameters. They are explained under respective%  metod or choice.%%Examples:%  noSamples = 64;%  endTime = 10;%  sampleTime = endTime /(noSamples-1)%  samplefreq = 1/sampleTime%  bandwith = samplefreq/2;		% A real valued time signal.%  t = linspace(0,endTime,noSamples);%  s = sin(2*pi*t);%  plot(s), figure%  plot(genfreqaxis(0,samplefreq,noSamples).',abs(fftshift(fft(s))))%  plotxline([-samplefreq/2, samplefreq/2],'m','--')%%Software Quality:%  (About what is done to ascertain software quality. What tests are done.)%%Known Bugs:%%References:%  [1]: Bj鰎klund S.: "DBT, A MATLAB Toolbox for Radar Signal Processing.%    Reference Guide", FOA-D--9x-00xxx-408--SE, To be published.%%See Also:%   *  DBT, A Matlab Toolbox for Radar Signal Processing  *% (c) FOA 1994-2000. See the file dbtright.m for copyright notice.%%  Start        : 990208 Svante Bj鰎klund (svabj).%  Latest change: $Date: 2000/10/16 15:40:15 $ $Author: svabj $.%  $Revision: 1.6 $% *****************************************************************************chkdtype(carrierFreq, 'RealScalarT')chkdtype(bandwidth, 'RealScalarT', 'CellArrayT')chkdtype(noFreq, 'IntScalarT')if (iscell(bandwidth))  freqLow = carrierFreq + bandwidth{1};  freqHigh = carrierFreq + bandwidth{2};else  freqLow = carrierFreq - bandwidth/2;  freqHigh = carrierFreq + bandwidth/2;end%iffreqAxis = linspace(freqLow, freqHigh, noFreq+1);freqAxis = freqAxis(1:noFreq).';%freqAxis.', freqLow, freqHigh		% For debugging.