xypc2.m

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%                             xypc2.m
%  Scope:   This MATLAB program plots a x-y graph of the difference between 
%           two data columns from different data files against a selected
%           data column from the first input file as x-axis; manual scaling
%           is available. In addition, the plot can incorporate statistic 
%           related to the selected graph, i.e. mean, standard deviation and 
%           root mean square (rms).
%  Usage:   xypc2
%  Inputs:  - the name of the first ASCII data input file (with extension),
%           - the name of the second ASCII data input file (with extension),
%           - the selected x-axis column index, 
%           - the column number to be compared between data files,
%           - title of the plot,
%           - y-axis label,
%           - x-axis label,
%           - optional, new axes limits [xmin xmax ymin ymax].
%  Outputs: - selected graph
%  Remarks: The column used as x-axis is selected from the first input data 
%           file. The computed/listed statistics is for the selected range of 
%           the x-axis. The comparison can use the same file.
%  External Matlab macros used:  rms
%  Last update: 08/23/00
%  Copyright (C) 1997-00 by LL Consulting. All Rights Reserved.

clear
close all

disp('  ');
fname1 = input('Specify the name of the first input data file (with extension) --> ','s');
hh1 = load(fname1);
[npt1,nmax1] = size(hh1);
if  nmax1 < 2
   disp('   ');
   error('Error  -  XYPC2; first input file has less than 2 columns');
   disp('   ');
   return
end

disp('   ');
fname2 = input('Specify the name of the second data file name (with extension) --> ','s');
hh2 = load(fname2);
[npt2,nmax2] = size(hh2);
if  nmax2 < 2
   disp('   ');
   error('Error  -  XYPC2; second input file has less than 2 columns');
   disp('   ');
   return
end

disp('   ');
nmax = min(nmax1,nmax2); 
npt = min(npt1,npt2);
index = input('Enter column number used as x-axis from first file --> ');
x = hh1(1:npt,index);            %  data from the first input file

yes = 'y';
answer = 'y';
fignr = 0;
while (strcmp(answer,yes) == 1)
   fignr = fignr + 1;
   disp('   ');
   n1 = input('Enter the column number to be compared from first file -->  ');
   disp('   ');
   n2 = input('Enter the column number to be compared from second file -->  ');
   if ( (n1 <= nmax1) & (n1 >= 1) & (n2 <= nmax2) & (n2 >= 1) ),
      y1 = hh1(1:npt,n1);
      y2 = hh2(1:npt,n2);
      y = y1 - y2;
      ymean = mean(y);
      ystd = std(y);
      yrms = rms(y);
      temp1 = ['mean = ',num2str(ymean)];
      temp2 = ['st.dev. = ',num2str(ystd)];
      temp3 = ['rms = ',num2str(yrms)];
      g = [temp1,' ;   ',temp2,' ;   ',temp3];
      disp('   ');
      aa = input('Enter title of the plot:  ','s');
      bb = input('Enter  Y  label:  ','s');
      cc = input('Enter  X  label:  ','s');
      xmin = min(x);
      xmax = max(x);
      ymin = min(y);
      ymax = max(y);
      disp('   ');
      disp('Place the text with statistics on the graph; ');
      temp = input('      Press <Enter> or <Return> key to start ... ');
      figure(fignr)
      plot(x,y),grid,...
      title(aa), ylabel(bb),xlabel(cc)
      gtext(g)           %  mouse placement of the text on a graph
      disp('   ');
      temp = input('Press <Enter> or <Return> key to continue ... ');
      disp('   ');

%  Select manual scaling for both axes

      manscaleq = input('Do you want manual scaling? (y/n)[n] ','s');
      if (strcmp(manscaleq,yes) == 1),
         redo_axes_limits = 1;
         while (redo_axes_limits == 1)
            fprintf('\nCurrent limits are: \n');
            fprintf('   xmin = %14.7f \n',xmin);
            fprintf('   xmax = %14.7f \n',xmax);
            fprintf('   ymin = %14.7f \n',ymin);
            fprintf('   ymax = %14.7f \n',ymax);
            disp('   ');
            axes_limits = input('Enter axes limits [xmin xmax ymin ymax]: ');
            xmin = axes_limits(1);
            xmax = axes_limits(2);
            ymin = axes_limits(3);
            ymax = axes_limits(4);
            fprintf('\nSelected limits are : \n');
            fprintf('   xmin = %14.7f \n',xmin);
            fprintf('   xmax = %14.7f \n',xmax);
            fprintf('   ymin = %14.7f \n',ymin);
            fprintf('   ymax = %14.7f \n',ymax);
            disp('   ');
            newlimq = input('Do you want to change axes limits? (y/n)[n] ','s');
            if (strcmp(newlimq,yes) == 0),
               redo_axes_limits = 0;
            end
         end
         clear xnew;
         clear ynew;
         kk = 0;
         for k = 1:npt
            if ((x(k) >= xmin) & (x(k) <= xmax)),
               kk = kk + 1;
               xnew(kk) = x(k);
               ynew(kk) = y(k);
            end
         end 
         xnew = xnew'; 
         ynew = ynew';
         ymean = mean(ynew);
         ystd = std(ynew);
         yrms = rms(ynew);
         temp1 = ['mean = ',num2str(ymean)];
         temp2 = ['st.dev. = ',num2str(ystd)];
         temp3 = ['rms = ',num2str(yrms)];
         g = [temp1,' ;   ',temp2,' ;   ',temp3];
         disp('   ');
         disp('Place the text with statistics on the graph; ');
         temp = input('      Press <Enter> or <Return> key to start ... ');
         fignr = fignr + 1;
         figure(fignr)
         plot(x,y), grid,...
         axis([xmin xmax ymin ymax]),...
         title(aa), ylabel(bb), xlabel(cc),...
         gtext(g)           %  mouse placement of the text on a graph
         disp('   ');
         temp = input('Press <Enter> or <Return> key to continue ... ');
      end
   else
      disp('Column is not in the range; check the selection ...');
      temp = ['The column range is: 1 to  ',num2str(nmax)];
      disp(temp);
   end
   disp('   ');
   answer = input('Do you want another plot? (y/n)[n] ','s');
end
disp('  ');
disp('End of the program  XYPC2 ');
disp('  ');