readWalkerF.m

function [H,B]=readWalkerF(filename)
%
% MIT License
%
% Copyright (c) 2022 Roman Szewczyk
%
% Permission is hereby granted, free of charge, to any person obtaining a copy
% of this software and associated documentation files (the "Software"), to deal
% in the Software without restriction, including without limitation the rights
% to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
% copies of the Software, and to permit persons to whom the Software is
% furnished to do so, subject to the following conditions:
%
% The above copyright notice and this permission notice shall be included in all
% copies or substantial portions of the Software.
%
% THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
% FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
% AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
% LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
% OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
% SOFTWARE.
%
%
% Function for reading data from Walker POD-401A Hysteresisgraph
%
% Input:
% filename - name of the data file
%



fid_r=fopen(filename,'r');

n=1;

HB=[];
UH=[];
UB=[];

step1=1;
step2=0;
step3=0;

while (!feof(fid_r))

  t=fgetl(fid_r);

  if n>42

     if step3
      UB=[UB; str2num(t)];
     end

     if step2
       if strcmp(t,'512')
          step2=0;
          step3=1;
       else
       UH=[UH; str2num(t)];
       end
     end

     if step1
       if strcmp(t,'512')
          step1=0;
          step2=1;
       else
       HB=[HB; str2num(t)];
       end
     end

  end

  n=n+1;

end
%

fclose(fid_r);

H=HB(1:2:end);
B=HB(2:2:end);

end